Abstract
We systematically studied the characteristics of hybrid perovskite-based surface plasmon nanolasers. If one changes the anion composition of perovskites, the emission wavelength can be easily tuned. We conducted in full-spectrum modeling that featured hybrid perovskite nanowires placed on different SiO2-coated metallic (Au, Ag, and Al) plates. The proposed nanocavities that supported plasmonic gap modes exhibited distinguished properties of nanolasers, such as low-transparency threshold-gain and low lasing threshold. The corresponding experimental results for the MAPbBr3 nanolaser on Ag revealed the low-threshold operation. These superior features were attributed to enhanced light-matter interaction with strong coupling. Therefore, the proposed scheme, integrated with hybrid perovskite as gain material, provides an excellent platform for nanoscale plasmon lasing in the visible to near-infrared spectra.
Introduction
Methyl ammonium lead halide perovskites MAPbX3, (MA = CH3NH3, X = I, Br, Cl), a class of hybrid organic-inorganic semiconductors, exhibit excellent optical properties suitable for semiconductor lasers because of their low non-radiative recombination rates and long carrier lifetimes [1]. Additionally, mixed halide hybrid perovskites can achieve broad energy bandgap tunability corresponding to emitting wavelengths covering the visible and parts of near-infrared spectra regions [2,3,4]. Several perovskites have been proven to be efficient optical gain materials, for example, in the form of thin films, nanoplates, and nanocrystals [2, 4,5,6,7,8,9,10]. However, the high lasing threshold is a concern in the use of perovskites in practical applications such as electrical-driven lasing [11] or optoelectronic integration systems. Their high crystalline quality (single crystal) may diminish the scattering loss [12] and lower the threshold during the pumping process. Recently, solution-processable perovskite nanowires (NWs) have been successfully demonstrated [1]. With two end facets as reflectors, the perovskite NWs naturally form a miniaturized optical cavity. The benefits, in addition to their remarkable electrical properties because of their strong intrinsic exciton oscillation strength, render perovskite NWs an excellent platform for realizing miniaturized devices such as room-temperature, low-cost and low-threshold, exciton-polariton lasers in a compact size [6, 13,14,15,16].
However, the footprint of optical modes associated with NW cavities is restricted by the diffraction limit. Surface plasmon polaritons (SPP) have been used to minimize the feature sizes of electromagnetic modes [17, 18]. Various plasmonic NW cavities have been investigated recently [19,20,21,22,23]. Cavities in a metal-insulator-semiconductor scheme are especially promising for sustaining hybrid plasmonic gap modes [24,25,26,28]. Therefore, we placed samples of doped or pure perovskite NWs on insulator-coated metallic plates to form plasmonic Fabry-Perot cavities. The resonant modes, resulting from circulation along the NW long axes of the plasmonic gap guided modes, are highly confined by the NWs. The reduced effective modal volume can boost the local photon density of states and the coupling strength between the excitons and photons. The laser characteristics of the proposed nanolaser as a robust cavity for lasing were investigated in this study. For example, the end facets of NWs may not be sufficient to reflect the guided plasmonic gap mode as mirrors, which may increase the threshold gain of cavities drastically. Additionally, intensive research interests are the capacities of common plasmonic metals such as gold (Au), silver (Ag), aluminum (Al), or copper (Cu) to lower the modal volume efficiently without any deterioration of laser performance throughout the visible to the near-infrared wavelength spectrum region.
In this study, we analyzed the characteristics of perovskite-based nanolasers placed on different SiO2-coated metallic (Au, Ag, and Al) plates over a wide spectrum by using the finite-element method (FEM: COMSOL package [29]). For single-crystal pure perovskite MAPbX3, the spectral gain windows related to the band transitions in the first Brillouin zone for X = Cl, Br, I are approximately 2.9 eV, 2.2 eV, and 1.5–1.6 eV [30], respectively, with corresponding emitting wavelengths λ = 425, 555, and 800 nm. The NWs depicted in the inset of Fig. 1a illustrating active region in the proposed nanocavities exhibit smooth surface morphology which can reduce the scattering loss during lasing. By converting the perovskites into those doped with a different halogen anion using the ion exchange reaction method [31], we can expand the emitting spectrum of perovskites to the nearly fully visible wavelength region. Of all the plasmonic metals, Ag exhibits a relatively low metal loss in the visible wavelength region, and Al, being a low-cost element, receives considerable attention because of its excellent plasmonic properties in the blue to ultraviolet wavelength region [32]. Au is commonly considered suitable for plasmon wave generation at the infrared region. These three metals are selected to be plasmonic media to enhance the charge-photon interaction in the system.
First, we investigated the modal features of the fundamental hybrid plasmonic guided modes on SiO2/Ag, SiO2/Al, and SiO2/Au metal plates using the two-dimensional (2D) FEM. Hybrid plasmonic gap modes originate from the coupling between the photonic and surface plasmon modes at the insulator-metal interface. Strong coupling strengths may result in severe intrinsic material loss because of the large overlap of modes with metal, which considerably depends on the gap thickness tg. We accordingly solved the modal loss, modal profiles, confinement factors, and transparency threshold gains of the hybrid plasmonic gap modes at various gap thickness tg, as indicated in Fig. 1b. The width of NWs was set to 100 nm at the cavity length L of 2.67 μm, which was comparable with the NWs obtained using the self-assembly method [33, 34]. Subsequently, the calculations of the resonant modes in nanocavities are implemented with the three-dimensional (3D) FEM [29]. Empirical calculations have proven that Ag is the best metal for MAPbBr3 nanolaser.
Therefore, we developed a low-threshold MAPbBr3 nanolaser on a SiO2-covered silver substrate through optical pumping. The proposed nanolaser exhibited an extremely small modal footprint, low lasing threshold, and tunable emission wavelengths, which can be used in applications such as next-generation light sources in the future.
Method
Preparation of Perovskite Nanowire Cavities
Because Ag exhibited the best plasmonic characteristics in nanolaser operations, we used MAPbBr3 NWs on the Ag plate with a 10-nm-thick SiO2 as a spacer layer to investigate nanolaser performance. The Ag plate was prepared using an e-gun evaporator on the Si substrate; the growth and annealing parameters were optimized for flat surface roughness followed by the deposition of the SiO2 layer [35]. MAPbBr3 NW synthesis was based on the one-step solution self-assembly method [33, 34]. First, 0.15 mmol MABr and 0.15 mmol PbBr2 powders were dissolved in 5 ml N, N-dimethylformamide, which functioned as the precursor solution. The precursor solution was then drop-casted on SiO2-covered Ag plates. Second, the substrate supporting Ag plates was placed on a stage in a beaker containing dichloromethane. The substrate was approximately 3 cm above the liquid surface of dichloromethane. Finally, the beaker covered by one layer of aluminum foil was placed in an incubator at 60 °C. In 4 h, the evaporation process of liquids in the beaker was accomplished and MAPbBr3 NWs were obtained on SiO2-covered Ag plates. We then mounted the NW nano-cavities, with configurations shown in Fig. 1a, in a high-vacuum chamber at 77 K.
Characterization of Lasing Action
To investigate the lasing action of a single NW cavity, we used the scanning electron microscope to search for MAPbBr3 NWs with a width approximately 100 nm and length closed to 3 μm. After identifying the location of those NWs, the samples were placed in a cryo-chamber for optical pumping. A third harmonic generation of a Nd:YVO4 pulse laser emitted at 355 nm was used as the pumping source, and the pulse duration and the repetition rate were 0.5 ns and 1 kHz, respectively. A × 100 near-ultraviolet infinity-corrected objective lens with a numerical aperture of 0.5 (Mitutoyo) was applied to focus the laser beam to the MAPbBr3 NW with the focal spot size approximately 15 μm in diameter. Only one NW was pumped at a time. Then, the emission signal of MAPbBr3 NW was collected using the same objective lens. An optical fiber with a 600-μm core diameter was attached to the lens. To collect the output emission from the end mirrors of NWs at various frequencies, a nitrogen-cooled charge coupled device was attached to a 320-mm-long single monochromator (iHR320, Horiba) at the other end of the fiber.
Results and Discussion
The proposed nanocavity exhibits low-threshold and strong modal confinement, depicted in Fig. 1a. We determined the resonance modes to investigate the characteristics of the cavity. The modal profiles of the nanocavity featuring a perovskite NW on a SiO2/Ag plate are presented in Fig. 1. We proved that the transverse views of the resonance mode profile |E| (b) at an antinode of the profile along the z-axis (x-y plane), (c) in the middle of thin gap (below the NW) (x-z plane), and (d) by bisecting the NW (y-z plane), respectively. As depicted in Fig. 1b, the profile of the cavity mode is indeed strongly confined with the features of the guided hybrid gap mode. The resonance pattern illustrated in Fig. 1d reveals the characteristics of both the NW photonic leaky modes (width below cutoff dimension) and propagating surface plasmon waves. In addition to an obvious standing-wave pattern along the long axis (z-direction) depicted in Fig. 1c, the lateral distribution of the mode (along the x-direction) defined by the small NW of nanoscale width is also sufficiently confined, which concurs with the plasmonic mode characteristics.
Characteristics of Plasmonic Hybrid Perovskite Waveguides
To investigate the plasmonic lasing characteristics in the visible to near-infrared wavelength region, the dielectric function of the hybrid version of Br-doped MAPbCl3 (MAPb(BrxCl1-x)3) and I-doped MAPbBr3 (MAPb(IyBr1-y)3) were examined. In the single-crystal perovskite MAPbX3, complex electronic configurations originate from the hybridization of an organic group, lead cationic, and halogen anionic states which causes multiple electronic transitions. In the lattice of doped MAPbX3, the dopants and vacancies, introduced during ion exchange reaction, may lower the crystalline quality and smear discrete electronic states. Therefore, instead of performing rigorous first-principle band calculations [36] to reveal each distinct absorption peak on the dispersion relation of the dielectric function, we denote that dielectric function ϵ as a simple function of the emission energy bandgap (Eg) of the mixed perovskites (MAPb(BrxCl1-x)3) with various doping compositions (x). The Moss rule [37], \( \epsilon (x)=a+b\sqrt{E_g(x)} \), is therefore adopted. The dielectric function ϵ is related to emission energy bandgap Eg of the mixed perovskites (MAPb(BrxCl1-x)3) with doping composition x. In the formula, the dielectric function ϵ(x) of pure perovskites MAPbCl3 (x = 0) and MAPbBr3 (x = 1) at their respectively corresponding emission wavelengths 425 and 555 nm [30] was used to determine fitting constants a and b. The energy bandgap of pure perovskites were deduced from the emission wavelengths. We then obtained the energy bandgap of mixed perovskite from the relation \( {E}_g^{\mathrm{MAPb}{\left({\mathrm{Br}}_x{\mathrm{Cl}}_{1-x}\right)}_3}(x)=\left(1-x\right){E}_g^{\mathrm{MAPb}{\mathrm{Cl}}_3}+x{E}_g^{\mathrm{MAPb}{\mathrm{Br}}_3} \) [38]. As shown in Fig. 2, the complex refractive index (n, k) of MAPb(BrxCl1-x)3 is derived from the dielectric function, \( n(x)+ ik(x)=\sqrt{\epsilon (x)} \), at each doping composition x. With the increase in the content of Br, doped MAPb(BrxCl1-x)3 exhibits a redshifted energy bandgap and emits at longer wavelengths. The same procedure was applied on deriving (n, k) of MAPb(IyBr1-y)3 with I doping composition y, as depicted in the right section of Fig. 2. The mixture of MAPbBr3 (y = 0) and MAPbI3 (y = 1), MAPb(IyBr1-y)3 emits at long wavelengths from 555 to 800 nm. The refractive indices of doped perovskites are depicted in Fig. 2 and are used in the following calculations. The refractive indices of pure perovskites MAPbCl3, MAPbBr3, and MAPbI3 at compositions x = 0, x = 1 (y = 0), and y = 1 are (2.2, 0.013), (2.30, 0.01), and (2.49, 0.0009). They are emitting at wavelengths at 425, 555, and 800 nm, respectively.
Next, we studied the characteristics of fundamental plasmonic gap modes, which is formed by the coupling between leaky photonic guided modes (below the cutoff frequency) of perovskite NWs and surface waves concentrated mainly at the interface of gap and metal. As illustrated in Fig. 3, we determined the modal loss and confinement factor [24] of the guided hybrid plasmonic modes for the waveguide—a mixed perovskite NW, MAPb(BrxCl1-x)3 and MAPb(IyBr1-y)3 of doping composition x and y from 0 to 1 on the SiO2/Ag, SiO2/Al or SiO2/Au plate of gap thickness tg at their corresponding emission wavelengths. We determined the guided modes corresponding to a large range of emitting wavelengths, from 425 to 555 nm for the perovskite MAPb(BrxCl1-x)3 and from 555 to 800 nm for MAPb(IyBr1-y)3. In these calculations, the complex refractive indices of the doped perovskites were (n, k) as depicted in Fig. 2. The dispersive refractive indices of metallic layers, Al, Ag, and Au, were adopted from previous experiment data [39].
With regard to perovskites emitting at wavelengths from 425 to 555 nm, the plasmonic waveguide (WG) with the NW on Al plate exhibited relatively lower modal loss (as to the Ag plate) close to short wavelengths as depicted in Fig. 3a. Thus, small metallic losses observed in the hybrid mode in the WGs on Al plates were not observed on Ag plates. One reason was that the surface plasmon frequency of perovskite/ SiO2/Ag was in the proximity of λ = 425 nm and that of perovskite/SiO2/Al was in the proximity of short wavelengths. The confinement of plasmonic wave near the plasmon frequency was extremely strong because of charge oscillation resonance. Therefore, the absorption of electromagnetic energy nearby was high. Otherwise, for the WG with perovskite MAPb(BrxCl1-x)3 with x close to 1 (emitting at long wavelengths of green colors) on Al plates, modal loss can be higher than that on Ag plates. We additionally determined the confinement factor of guided plasmonic gap modes at fixed gap thickness (tg = 0, 15, and 30 nm). The strong confinement of modal profile inside the thin gap indicated strong overlapping with the metal, thus causing severe ohmic loss. This was controlled by increasing the gap thickness. The confinement factors of perovskite WGs on Ag plates were relatively higher than other WGs on Al plates. This suggested a strong confinement of plasmonic WG modes near the gain medium on the Ag plates and a small overlap with the surroundings.
The limited overlap of guided modes with metal leads to lower modal loss as previously discussed, because metallic loss is solely responsible for the modal loss in this scheme. We can observe that, as depicted in the Fig. 3b, when the plasmon frequency of Ag approaches (around short wavelengths), the confinement factors become stronger in the WG on the Al plates. To reveal the confinement of plasmonic gap modes, we calculated the modal profiles |E| of a MAPb(BrxCl1-x)3 NW WGs on Ag plate as depicted in insets of Fig. 3b at wavelengths of 425 (x = 0) and 500 nm (x = 0.58) at fixed tg of 5 nm. For the WG at shorter wavelengths, or around the minimal thickness tg = 0 nm, coupling between the nanowire photonic mode and surface plasmonic mode were stronger, leading to a highly confined plasmonic mode (as depicted in the plots with yellow circle). However, at longer emitting wavelengths of perovskite with higher doping composition, the coupling strengths become weaker. The plasmonic gap modes revealed less intensity inside the gap, and a considerable amount of energy spreads around the surrounding medium (as indicated by the picture with a red circle). The limited overlap of guided modes with metal led to lower modal loss. The tendency of the modal loss curve declined with the increase in the gap thickness. At longer wavelengths, similar to the WG with thicker gaps, lower coupling strength results in a lower strength of confinement.
In WGs with hybrid perovskites emitting at wavelengths from 555 to 800 nm, the scheme with MAPb(BrxCl1-x)3 NW, the Au plate may not be its suitable plasmonic medium, as inferred by the large modal loss (as to the Ag and Al plate) as depicted in Fig. 3c. The Au plate exhibited a plasmonic absorption peak at approximately 520 nm. Therefore, the intrinsic metal loss increases when approaching plasmonic wavelengths. However, superior chemical stability renders Au a preferred candidate to explore the plasmonic properties in photonic devices, especially at red and orange color wavelengths. The imaginary part of the refractive index of Ag was smaller than that of Al in this wavelength region. At approximately 550-nm wavelengths, the metal loss dominated the modal loss. Irrespective of whether the gap was thin or thick, the corresponding modal loss of Al was larger than that in Ag as depicted in Fig. 3c. Figure 3d depicted that the confinement factors of three WGs with thicker gaps are similar at longer wavelengths. The tendency of confinement factor curves and characteristics of modal profiles illustrated in Fig. 3d are affected by the coupling strengths; in a manner similar to the aforementioned discussion of Fig. 3b. To investigate the resonant modes in the cavities based on this fundamental plasmonic gap modes, which is the most likely to lase, we determined the transparency threshold gains in each case, as presented in Fig. 4.
Threshold Performance of Plasmonic Hybrid Perovskite Nanolaser
We evaluated transparency threshold gains by using the confinement factor and modal loss of each WG for comparing resonance properties in the nanocavities of various metals and gap thicknesses. The transparency threshold is defined as the ratio of modal loss over the confinement factor [24]. As depicted in Fig. 4a, Ag exhibits superior confinement factors and transparency thresholds for each perovskite MAPb(BrxCl1-x)3 WG at its corresponding emission wavelength. The optimal thickness of the cavities with the lowest threshold should be the minimal case of tg = 0. For example, at the minimum tg = 0, the transparency threshold gains of the plasmonic modes on Ag plates were 18470.5 and 6259.1 denoted by the black stars in Fig. 4a at λ = 425 nm and Fig. 4b at λ = 555 nm, respectively. These values were slightly lower than those at other gap thicknesses. The hybrid plasmonic mode formed by direct coupling to the surface plasmon mode exhibits ultimately confined fields. However, the modal profile suitable for the end reflectors to thoroughly reflect is often not the extremely confined profile. Furthermore, the oxidation layer is commonly formed during the deposition process, but an oxidation layer may form inexorably over time. With regard to the oxidation layer of limited thickness on the Ag plate, the threshold was relatively low when the thickness was approximately 5 to 7 nm. At the wavelengths close to 425 nm, the transparency threshold-gain of the perovskite WG on Al was slightly lower than that on Ag, as results of lower material loss and substantial overlap with the lossy region. From the discussions of modal loss and confinement factors and the results illustrated in Fig. 3, it is not difficult to anticipate the lower thresholds of the cavities on the Ag plates with doped perovskites emitting at long wavelengths of orange and red colors or infrared spectra, as depicted in Fig. 4b. The threshold was considerably high in the cavities on Au because of the relatively large material absorption. Although Al is low-cost and exhibits a limited tendency to form a measurable oxidation layer, it can still function as an excellent as a plasmonic medium in these doped perovskite-incorporated schemes because it corresponds to tolerable transparency thresholds and is less sensible to the gap thickness and doping composition, as depicted in Fig. 4a, b. Therefore, Ag is the best choice as a plasmonic medium for investigating the metal-related perovskite lasing process even though it is necessary to coat it with an oxidation layer. A low-index dielectric (oxidation layer) of approximately 5 to 10 nm thickness can sustain guided plasmonic gap modes; this gap layer may result in suitable reflection at end facets to reduce unwanted mirror loss.
After determining the spatial distribution of modal profiles as shown in Fig. 1b–d, we estimated the quality factor, Q using Re[fr]/2 Im[fr], where the fr is the complex eigen-frequency of the resonant mode obtained using the 3D FEM. We compared these estimated values of the Q-factor of the resonance modes in the cavities obtained using three perovskites (MAPbX3; X: Cl, Br, and I) on SiO2-coated Ag and Al plates at a fixed gap thickness tg of 7 nm. For fair comparison, cavity length L was set to four effective wavelengths (4λ/ Re[neff]) at the corresponding λ, where Re[neff] is the effective modal index of guided modes in each case. We concluded that because of the large intrinsic material loss of Al in the visible spectrum, the Q-factors of the cavities on Al plates were not comparable to Ag plates. The Q-factor was certainly higher in the cavity at the wavelength λ close to 425 nm. However, it was less capable of confining the hybrid plasmonic mode inside the gain region near the thin gaps, as indicated by the confinement factor. Therefore, the comparison of Q-factors also suggested that Ag is preferred in the perovskite-incorporated plasmonic scheme in the visible spectrum. Therefore, the scattering loss from end facets may not be the dominant factor that degrades the performance of cavities. As indicated by the lowest transparency threshold gains as depicted in the Fig. 4b, the resonant modes on the Ag plate close to 800 nm potentially revealed a relatively high value of Q-factor, which indicates potential in future applications related to plasmon-enhanced exciton-photon coupling and bio-sensing.
Power-dependent photoluminescence was measured to resolve the emission spectra and record the lasing power at various pumping inputs, as displayed in Fig. 5. The emission spectra of the cavity with a MAPbBr3 NW on the SiO2-covered Ag plate are presented in Fig. 5a. Emission peaks in the spectrum were then fitted to obtain the light-light (L-L) curve of MAPbBr3 nanolaser. In the emission spectra, the output power dramatically increases at the pumping power higher than the threshold (at approximately 1.62 μW average power); the sharp change was also observed in the corresponding L-L curves as shown in Fig. 5b. Once the pumping power is higher than the lasing threshold, single-peak emission linewidth of lasing output decreases from 7.6 nm to approximately 0.5 nm. The output signals were collected from the NW end facets. The threshold power is one order of magnitude smaller than those of the ZnO NW nanolaser on the Ag plate. Possible reasons could be the superior material gain provided by MAPbBr3 than that of ZnO and the smaller internal loss at 550 nm than that at 370 nm [35]. Additionally, perovskite NW plasmon lasers [26,27,28] reveal various thresholds at different temperatures. To operate under strong pumping powers at room temperature while maintaining devices performance without severe material ablation and thermal degradation, the thermal stability [40] and crystal quality [41] of perovskite NW could be the key parameters to be improved. Desirable characteristics such as low threshold and narrow linewidth extend potential applications in future miniature active photonic devices.
Conclusions
Full-spectrum analysis of laser parameters including guided mode characteristics, transparency threshold gains, and estimated quality factor of the perovskite-based nanolasers that featured doped perovskite nanowires placed on three types of SiO2-coated metallic (Ag, Al, and Au) plates was conducted. The calculated results using FEM revealed that Ag can be a suitable choice as a plasmonic metal for perovskite MAPbX3-based optoelectronic application. The proposed nanocavity—a MAPbBr3 nanowire on the SiO2/Ag plate, exhibited low lasing threshold and narrow linewidth corresponding to nanoscale output footprint. These advantages can result in strong coupling of exciton-polariton-photons. With the superior charge features possessed by perovskites, this scheme is an appropriate candidate for developing next-generation light sources.
Availability of Data and Materials
All data supporting the conclusions of this article are included within the article.
Abbreviations
- 2D:
-
Two-dimensional
- 3D:
-
Three-dimensional
- FEM:
-
Finite-element method
- L-L:
-
Light-light
- NUV:
-
Near-ultraviolet
- NW:
-
Nanowire
- SPP:
-
Surface plasmon polaritons
- WG:
-
Waveguide
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Acknowledgments
The authors would like to thank Prof. Shu-Wei Chang, for his long-term support and insightful discussions regarding the laser characteristics. This work is supported by the Research Team of Photonic Technologies and Intelligent Systems at National Chiao Tung University within the framework of the Higher Education Sprout Project by the Ministry of Education in Taiwan.
Funding
This work was supported by Ministry of Science and Technology (MOST) in Taiwan (Nos. MOST 105-2221-E-019-049-MY3, MOST 106-2221-E-009-112-MY3, MOST 107-2119-M-009-016, MOST 108-2221-E-019-055-MY3, and MOST 108-2221-E-019-057-MY3), National Natural Science Foundation of China (Nos. 61704024 and 11734005), Natural Science Foundation of Jiangsu Province (No. BK20170696), and National Key Research and Development Plan of China (Nos. 2017YFA0700500 and 2018YFA0209101).
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PJ, KB, CX, TC, and TR initiated the study. PJ, QY, KB, and TR performed the numerical calculation and simulation. CY, HL, YZ, QN, CX, and TC performed the sample preparation, device fabrication, and optical experiments. PJ, QY, CY, YZ, TC, and TR wrote the manuscript. PJ and QY equally contributed to this work. All authors analyzed the calculated and experimental data. All authors discussed the results and commented on the manuscript. The author(s) read and approved the final manuscript.
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Cheng, PJ., Zheng, QY., Hsu, CY. et al. Full-Spectrum Analysis of Perovskite-Based Surface Plasmon Nanolasers. Nanoscale Res Lett 15, 66 (2020). https://doi.org/10.1186/s11671-020-3290-6
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DOI: https://doi.org/10.1186/s11671-020-3290-6