- 作 者: ( "guojia fang" OR "guo-jia fang" )
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Balanced Charge-Carrier Transport and Defect Passivation in Far-Red Perovskite Light-Emitting DiodesLaser & Photonics Reviews (IF 10.947) Pub Date : 2023-01-23 ,DOI:10.1002/lpor.202200871Shuxin Wang, Yongjie Liu, Chenwei Liu, Wenlong Shao, Chen Wang, Meng Xiao, Guoyi Chen, Zhiqiu Yu, Chen Tao, Weijun Ke, Guojia FangPerovskites are promising light emitters that can cover broad-range emissions over the entire visible spectrum. However, few studies have focused on uncommon wavebands, such as far-red emission of 700–750 nm that has broad applications in biology, horticulture lighting, optogenetics, etc. Here, a strategy is demonstrated to achieve high-performance far-red perovskite light-emitting diodes (PeLEDs) ...
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Perovskite-like Silver Halide Single-Crystal Microbelt Enables Ultrasensitive Flexible X-ray DetectorsACS Nano (IF 18.027) Pub Date : 2023-01-08 ,DOI:10.1021/acsnano.2c10318Kailian Dong, Hai Zhou, Wenlong Shao, Zheng Gao, Fang Yao, Meng Xiao, Jiashuai Li, Yongjie Liu, Shuxin Wang, Shun Zhou, Hongsen Cui, Minchao Qin, Xinhui Lu, Chen Tao, Weijun Ke, Guojia FangLead halide perovskite single crystals have attracted wide interest in the field of X-ray detection due to their excellent photophysical properties. However, their inherent toxicity and high thickness restrict their applications in flexible devices. In this paper, designing a micronanometer-scale X-ray detector based on all-inorganic lead-free CsAg2I3 (CAI) single crystal microbelts (MBs) has addressed ...
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Defects Passivation via Potassium Iodide Post-Treatment for Antimony Selenosulfide Solar Cells with Improved PerformanceAdvanced Functional Materials (IF 19.924) Pub Date : 2022-12-20 ,DOI:10.1002/adfm.202211657Jiashuai Li, Zheng Gao, Xuzhi Hu, Shuxin Wang, Yongjie Liu, Chen Wang, Kailian Dong, Zhaofeng Zeng, Chen Tao, Guojia FangAntimony selenosulfide (Sb2(S,Se)3) has been emerging as a promising light absorber in the past few years owing to tunable bandgap (1.1–1.7 eV), high absorption coefficient (>105 cm−1) and excellent phase and environmental stability. However, the efficiency of Sb2(S,Se)3 solar cells lags far behind the Shockley–Queisser limit. One of the critical obstacles originates from various extrinsic and intrinsic ...
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Modulation of nucleation and crystallization in PbI2 films promoting preferential perovskite orientation growth for efficient solar cellsEnergy & Environmental Science (IF 39.714) Pub Date : 2022-12-09 ,DOI:10.1039/d2ee03342aWenlong Shao, Haibing Wang, Feihong Ye, Cheng Wang, Chen Wang, Hongsen Cui, Kailian Dong, Yansong Ge, Ti Wang, Weijun Ke, Guojia FangFormamidinium (FA)-rich lead iodide perovskite solar cells (PSCs) are gaining popularity because of their excellent photovoltaic performance. Nevertheless, the FA-rich perovskites processed by a two-step sequential deposition method usually possess many non-radiative recombination sites, undesired crystal orientations, and too much excess lead iodide (PbI2) that can seriously deteriorate device performance ...
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Synergistic passivation and stepped-dimensional perovskite analogs enable high-efficiency near-infrared light-emitting diodesNature Communications (IF 17.694) Pub Date : 2022-12-02 ,DOI:10.1038/s41467-022-35218-0Shengyong Hu, Meng Xiao, Zheng Gao, Pengbing Gui, Fang Yao, Kailian Dong, Jiashuai Li, Xuzhi Hu, Hengjiang Cong, Shuangfeng Jia, Ti Wang, Jianbo Wang, Gang Li, Wei Huang, Weijun Ke, Jianpu Wang, Guojia Fang
Formamidinium lead iodide (FAPbI3) perovskites are promising emitters for near-infrared light-emitting diodes. However, their performance is still limited by defect-assisted nonradiative recombination and band offset-induced carrier aggregation at the interface. Herein, we introduce a couple of cadmium salts with acetate or halide anion into the FAPbI3 perovskite precursors to synergistically passivate
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Defect Passivation on Lead-Free CsSnI3 Perovskite Nanowires Enables High-Performance Photodetectors with Ultra-High StabilityNano-Micro Letters (IF 23.655) Pub Date : 2022-11-07 ,DOI:10.1007/s40820-022-00964-9Zheng Gao, Hai Zhou, Kailian Dong, Chen Wang, Jiayun Wei, Zhe Li, Jiashuai Li, Yongjie Liu, Jiang Zhao, Guojia Fang
In recent years, Pb-free CsSnI3 perovskite materials with excellent photoelectric properties as well as low toxicity are attracting much attention in photoelectric devices. However, deep level defects in CsSnI3, such as high density of tin vacancies, structural deformation of SnI6− octahedra and oxidation of Sn2+ states, are the major challenge to achieve high-performance CsSnI3-based photoelectric
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Suppressing Phase Segregation in Wide Bandgap Perovskites for Monolithic Perovskite/Organic Tandem Solar Cells with Reduced Voltage LossSmall (IF 15.153) Pub Date : 2022-10-30 ,DOI:10.1002/smll.202204081Chen Wang, Wenlong Shao, Jiwei Liang, Cong Chen, Xuzhi Hu, Hongsen Cui, Chenwei Liu, Guojia Fang, Chen TaoWide bandgap (WBG) perovskites through tuning iodine/bromine ratios are capable of merging with narrow bandgap organic bulk heterojunctions to construct tandem solar cells to overcome the Shockley–Queisser limitation. However, WBG perovskites readily suffer from light-induced halide ion migration, leading to detrimental phase segregation and hence severe open-circuit voltage (VOC) loss. Here, to solve ...
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Efficient Tin (II) Fluoride-Free Formamidinium Tin Triiodide Perovskite Solar Cells via Composition and Additive EngineeringSolar RRL (IF 9.173) Pub Date : 2022-10-29 ,DOI:10.1002/solr.202200859Lishuai Huang, Wenwen Zheng, Wenjun Zhang, Shun Zhou, Guojun Zeng, Dexin Pu, Jin Zhou, Hongling Guan, Weicheng Shen, Guang Li, Guojia Fang, Weijun KeTin halide perovskite solar cells (TPSCs) have attracted extensive attention because of their low toxicity and high theoretical efficiency. However, rapid crystallization, rich defects, and easy oxidation of tin-based perovskite films seriously restrict solar cell performance. Herein, a composition and additive engineering solution by removing commonly used tin fluoride additive from formamidinium ...
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Pre-annealing treatment for high-efficiency perovskite solar cells via sequential depositionJoule (IF 46.048) Pub Date : 2022-10-24 ,DOI:10.1016/j.joule.2022.10.001Haibing Wang, Feihong Ye, Jiwei Liang, Yongjie Liu, Xuzhi Hu, Shun Zhou, Cong Chen, Weijun Ke, Chen Tao, Guojia FangGrain boundaries (GBs) have been shown to initiate metal halide perovskite degradation under light, moisture, and/or heat stresses due to the existence of various defects, making them extremely vulnerable in perovskite solar cells (PSCs). Although various post-treatments have been proven to be effective in repairing GBs, preventing the degradation from perovskite GBs remains an extremely difficult ...
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Over 11% Efficient CuGaSe2 Solar Cells Without Using KCN TreatmentSolar RRL (IF 9.173) Pub Date : 2022-10-18 ,DOI:10.1002/solr.202200766Junbo Gong, Duoqi Gao, Zengyang Ma, Xuke Yang, Junjun Zhang, Xinxing Liu, Chao Chen, Jiang Tang, Bo Da, Jianmin Li, Guojia Fang, Xudong XiaoCuGaSe2 (CGS) has a bandgap energy of 1.68 eV and is theoretically very suitable to be in tandem with silicon or Cu(In,Ga)Se2 solar cells. However, due to the high quantity of surface defects, high-performance CGS usually relies on a KCN surface treatment, which is a high-toxic process and restricts its further development. Herein, by reducing the exposure time to air of the CGS layer as far as possible ...
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Pressure-Induced Indirect-Direct Bandgap Transition of CsPbBr3 Single Crystal and Its Effect on Photoluminescence Quantum Yield (Adv. Sci. 29/2022)Advanced Science (IF 17.521) Pub Date : 2022-10-14 ,DOI:10.1002/advs.202270186Junbo Gong, Hongxia Zhong, Chan Gao, Jiali Peng, Xinxing Liu, Qianqian Lin, Guojia Fang, Shengjun Yuan, Zengming Zhang, Xudong Xiao
CsPbBr3 Single Crystal
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Pressure-Induced Indirect-Direct Bandgap Transition of CsPbBr3 Single Crystal and Its Effect on Photoluminescence Quantum YieldAdvanced Science (IF 17.521) Pub Date : 2022-08-10 ,DOI:10.1002/advs.202201554Junbo Gong, Hongxia Zhong, Chan Gao, Jiali Peng, Xinxing Liu, Qianqian Lin, Guojia Fang, Shengjun Yuan, Zengming Zhang, Xudong XiaoDespite extensive study, the bandgap characteristics of lead halide perovskites are not well understood. Usually, these materials are considered as direct bandgap semiconductors, while their photoluminescence quantum yield (PLQY) is very low in the solid state or single crystal (SC) state. Some researchers have noted a weak indirect bandgap below the direct bandgap transition in these perovskites. ...
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Polar methylammonium organic cations detune state coupling and extend hot-carrier lifetime in lead halide perovskitesChem (IF 25.832) Pub Date : 2022-07-27 ,DOI:10.1016/j.chempr.2022.07.005Cheng Wang, Weibin Chu, Feihong Ye, Zhenwei Ou, Zhe Li, Quanbing Guo, Zhuo Zheng, Zhiping Wang, Xiaoze Liu, Guojia Fang, Oleg Prezhdo, Ti Wang, Hongxing XuThe slow hot-carrier relaxation properties of lead halide perovskites show great promise for hot-carrier solar cells. Here, we discover that the hot-carrier relaxation could be prolonged by two orders of magnitude in lead halide perovskites. By ultrafast spectroscopy, we unravel a slow hot-carrier relaxation process mediated by an intermediate state above the conduction band minimum (CBM). This intermediate ...
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Simple Ball-Milled Molybdenum Sulfide Nanosheets for Effective Interface Passivation with Self-Repairing Function to Attain High-Performance Perovskite Solar CellsSolar RRL (IF 9.173) Pub Date : 2022-05-31 ,DOI:10.1002/solr.202200061Lan Xiao, Ziyi Wang, Chang Shi, Xueli Yu, Liang Ma, Haixia Li, Guojia Fang, Pingli QinInterface defects can generate serious nonradiative recombination in perovskite solar cells (PSCs) and need to be restrained for further optimization of device performance. Herein, common and easily available 2D MoS2 nanosheets prepared by a ball-milled method are demonstrated. The obtained MoS2 has bigger specific surface area and narrower pore distribution, inducing more water to be trapped on the ...
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Unveiling the key factor affecting the illumination deterioration and response measures for lead halide perovskite solar cellsJournal of Energy Chemistry (IF 13.599) Pub Date : 2022-05-15 ,DOI:10.1016/j.jechem.2022.05.011Feihong Ye, Haibing Wang, Weijun Ke, Chen Tao, Guojia FangSo far, it’s been widely acknowledged that the PbI2 decomposition under illumination mainly accounts for the degradation of perovskite solar cells (PSCs) under maximum power point (MPP) tracking condition. However, PSCs without excess PbI2 were also reported to deteriorate rapidly under the same condition. Here, we demonstrate that the key to enhance PSCs stability under MPP tracking condition is not ...
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Highly Efficient Quasi-2D Green Perovskite Light-Emitting Diodes with Bifunctional Amino AcidAdvanced Optical Materials (IF 10.05) Pub Date : 2022-04-21 ,DOI:10.1002/adom.202200276Chenwei Liu, Yongjie Liu, Shuxin Wang, Jiwei Liang, Cheng Wang, Fang Yao, Weijun Ke, Qianqian Lin, Ti Wang, Chen Tao, Guojia FangQuasi-two-dimensional (quasi-2D) perovskite light-emitting diodes (PeLEDs) are considered as one of the most potential candidates in electroluminescence territory owing to their unique quantum confinement effect and excellent thermal stability of the light. Nevertheless, heterogeneous energy domain distribution leads to severe non-radiative recombination in the process of energy transfer, which enormously ...
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Origins and influences of metallic lead in perovskite solar cellsJoule (IF 46.048) Pub Date : 2022-04-12 ,DOI:10.1016/j.joule.2022.03.005Jiwei Liang, Xuzhi Hu, Chen Wang, Chao Liang, Cong Chen, Meng Xiao, Jiashuai Li, Chen Tao, Guichuan Xing, Rui Yu, Weijun Ke, Guojia FangMetallic lead (Pb0) impurities in metal-halide perovskites have attracted tremendous research concerns owing to their detrimental effects on perovskite solar cells (PSCs). However, the origins and influences of the Pb0 behind this issue have yet to be well understood. Herein, we show that Pb0 is hardly formed in the growth of halide perovskites but is easily postformed in the perovskite films with ...
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Internal Encapsulation for Lead Halide Perovskite Films for Efficient and Very Stable Solar CellsAdvanced Energy Materials (IF 29.698) Pub Date : 2022-03-28 ,DOI:10.1002/aenm.202200361Yansong Ge, Feihong Ye, Meng Xiao, Haibing Wang, Chen Wang, Jiwei Liang, Xuzhi Hu, Hongling Guan, Hongsen Cui, Weijun Ke, Chen Tao, Guojia FangExternal encapsulation technique as a straightforward craft process has been adopted to prevent the infiltration of moisture and oxygen, thereby improving environmental stabilities of lead halide perovskite solar cells (PSCs). However, irreversible light-induced degradation originating from various vacancies and ion diffusion or migration inside the device cannot be efficiently solved by external encapsulation ...
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Enhanced photo-response performance of Cu2O-based graded heterojunction optoelectronic devices with a Ga2O3 buffer layerJournal of Materials Chemistry C (IF 8.067) Pub Date : 2022-03-02 ,DOI:10.1039/d2tc00652aMeng Xiao, Kailian Dong, Jiwei Liang, Jin He, Guojia FangCuprous oxide (Cu2O) has been widely investigated in optoelectronic devices because of its non-toxicity, high optical absorption coefficient, intrinsic p-type conductivity, and high hole mobility. However, misaligned energy levels remain an obstacle to obtaining efficient optoelectronic devices due to the extremely high conduction band minimum of Cu2O. Here, a band-aligned wide bandgap Ga2O3 buffer ...
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Revealing key factors of efficient narrow-bandgap mixed lead-tin perovskite solar cells via numerical simulations and experimentsNano Energy (IF 19.069) Pub Date : 2022-02-21 ,DOI:10.1016/j.nanoen.2022.107078Wenjun Zhang, Lishuai Huang, Wenwen Zheng, Shun Zhou, Xuzhi Hu, Jin Zhou, Jiashuai Li, Jiwei Liang, Weijun Ke, Guojia FangMixed lead and tin (Pb-Sn) halide perovskites promise high-performance solar cells because of their narrow bandgaps and other outstanding essential properties. However, there is still a big gap between the performance of the practical devices and theoretical limitations. Here we investigate key factors for realizing high-performance narrow-bandgap Pb-Sn perovskite solar cells (PSCs) via numerical simulations ...
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Enhanced efficiency and stability of triple-cation perovskite solar cells with CsPbIxBr3 − x QDs “surface patches”SmartMat Pub Date : 2022-02-02 ,DOI:10.1002/smm2.1087Guang Yang, Hengkai Zhang, Siqi Li, Zhiwei Ren, Guojia Fang, Dangyuan Lei, Gang Li
Perovskite solar cells (PSCs) with a light-harvesting three-dimensional perovskite bulk layer as backbone component have achieved great progress in performance. Nonradiative recombination is one major place to improve efficiency and stability as they cause significant energy loss in PSCs. Additionally, an imperfection in grain boundaries will initiate device degradation. One of the most successful
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Quasi-Single Crystalline Cuprous Oxide Wafers via Stress-Assisted Thermal Oxidation for Optoelectronic DevicesAdvanced Functional Materials (IF 19.924) Pub Date : 2021-12-22 ,DOI:10.1002/adfm.202110505Meng Xiao, Pengbin Gui, Kailian Dong, Liangbin Xiong, Jiwei Liang, Fang Yao, Wenjing Li, Yongjie Liu, Jiashuai Li, Weijun Ke, Chen Tao, Guojia FangP-type semiconductor cuprous oxide (Cu2O) offers promising optoelectronic applications such as solar cells and photodetectors owing to its considerable absorption coefficients and high carrier mobility. However, polycrystalline Cu2O films with low carrier mobility resulting from excessive grain boundaries and structure disorder fail to meet the demands for these optoelectronic applications. Here a ...
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A multi-functional halogen-free cesium salt bulk-doping treatment toward performance-enhancement of perovskite solar cellsJournal of Power Sources (IF 9.794) Pub Date : 2021-12-14 ,DOI:10.1016/j.jpowsour.2021.230900Wenlong Shao, Haibing Wang, Feihong Ye, Chen Wang, Chenwei Liu, Shun Zhou, Chen Tao, Guojia FangDopant engineering involving molecular/ionic additives is a kind of usual technique to achieve state-of-the-art perovskite solar cells (PSCs) with favorable stability. It is critical to maximize the functions of doping agents for perovskite due to its unstable structure, inherent defect, weak water resistance, and so on. To ameliorate these problems, herein, we introduce a multi-functional halogen-free ...
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Organic-inorganic hybrid hole transport layers with SnS doping boost the performance of perovskite solar cellsJournal of Energy Chemistry (IF 13.599) Pub Date : 2021-12-03 ,DOI:10.1016/j.jechem.2021.11.034Xiaolu Zheng, Haibing Wang, Feihong Ye, Cong Chen, Weijun Ke, Wenjing Zhang, Chuanxin He, Yanlong Tai, Guojia FangPerovskite solar cells (PSCs) have demonstrated excellent photovoltaic performance which currently rival the long-standing silicon solar cells’ efficiency. However, the relatively poor device operational stability of PSCs still limits their future commercialization. Binary sulfide is a category of materials with promising optoelectrical properties, which shows the potential to improve both the efficiency ...
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Interfacial Engineering of A Thiophene-based 2D/3D Perovskite Heterojunction for Efficient and Stable Inverted Wide-Bandgap Perovskite Solar CellsNano Energy (IF 19.069) Pub Date : 2021-10-08 ,DOI:10.1016/j.nanoen.2021.106608Cong Chen, Jiwei Liang, Junjun Zhang, Xinxing Liu, Xinxing Yin, Hongsen Cui, Haibing Wang, Chen Wang, Zaifang Li, Junbo Gong, Qianqian Lin, Weijun Ke, Chen Tao, Bo Da, Zejun Ding, Xudong Xiao, Guojia FangFabricating highly efficient and stable inverted wide-bandgap (WBG) perovskite solar cells (PSCs) is the key factor for developing high-efficiency and stabilized tandem solar cells. Herein, we propose an interfacial engineering strategy to form a 2D/3D perovskite heterojunction using 2-thiopheneethylammonium chloride (TEACl). The thiophene-based 2D/3D perovskite heterojunction improves the optoelectronic ...
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Luminescence enhancement of lead halide perovskite light-emitting diodes with plasmonic metal nanostructuresNanoscale (IF 8.307) Pub Date : 2021-09-09 ,DOI:10.1039/d1nr05667kMingfei Zheng, Guojia FangMetal halide perovskites, as newly emerging light emitters, have been attracting considerable attention on luminescent materials and devices, due to their superior optoelectronic properties and potential practical applications. Recently, perovskite light-emitting diodes (PeLEDs) based on lead halide perovskites (LHPs) have been largely designed and intensively studied in laboratory platforms. However ...
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Manipulating the morphology of CdS/Sb2S3 heterojunction using a Mg-doped tin oxide buffer layer for highly efficient solar cellsJournal of Energy Chemistry (IF 13.599) Pub Date : 2021-08-19 ,DOI:10.1016/j.jechem.2021.08.029Jiashuai Li, Liangbin Xiong, Xuzhi Hu, Jiwei Liang, Cong Chen, Feihong Ye, Jing Li, Yongjie Liu, Wenlong Shao, Ti Wang, Chen Tao, Guojia FangAntimony sulfide (Sb2S3) is an appealing semiconductor as light absorber for solar cells due to its high absorption coefficient, appropriate band gap (~1.7 eV) and abundance of constituent elements. However, power conversion efficiency (PCE) of Sb2S3-based solar cells still lags much behind the theoretically predicted due to the imperfect energy level alignment at the charge transporting layer/Sb2S3 ...
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Mesoporous Au@Cu2−x S Core–Shell Nanoparticles with Double Localized Surface Plasmon Resonance and Ligand Modulation for Hole-Selective Passivation in Perovskite Solar CellsSolar RRL (IF 9.173) Pub Date : 2021-07-10 ,DOI:10.1002/solr.202100358Tong Wu, Zhengchun Wang, Lan Xiao, Pingli Qin, Zhongli Qin, Liang Ma, Wei Zeng, Xiangbai Chen, Liangbin Xiong, Guojia FangCore–shell nanomaterials have led to their fascinating properties in optical applications due to the localized surface plasmon resonance (LSPR). Herein, a mesoporous core–shell Au@Cu2−x S nanomaterial with dual LSPR characteristics is introduced to stabilize and passivate the perovskite/spiro-OMeTAD interface of perovskite solar cells (PSCs). Thanks to the LSPR, Au@Cu2−x S nanoparticles (NPs) have ...
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Stable and low-photovoltage-loss perovskite solar cells by multifunctional passivationNature Photonics (IF 39.728) Pub Date : 2021-07-05 ,DOI:10.1038/s41566-021-00829-4Feihong Ye, Qiong Liang, Hang Yin, Yuxuan Chen, Yuanlin Zhuang, Siqi Li, Bowei Gao, Jianbo Wang, Tingting Shi, Xin Wang, Xinhui Lu, Hongbin Wu, Jianhui Hou, Dangyuan Lei, Shu Kong So, Yang Yang, Guojia Fang, Gang LiMetal halide perovskite solar cells have demonstrated a high power conversion efficiency (PCE), and further enhancement of the PCE requires a reduction of the bandgap-voltage offset (WOC) and the non-radiative recombination photovoltage loss (ΔVOC,nr). Here, we report an effective approach for reducing the photovoltage loss through the simultaneous passivation of internal bulk defects and dimensionally ...
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Revealing the Mechanism of π Aromatic Molecule as an Effective Passivator and Stabilizer in Highly Efficient Wide-Bandgap Perovskite Solar CellsSolar RRL (IF 9.173) Pub Date : 2021-06-29 ,DOI:10.1002/solr.202100249Jiwei Liang, Cong Chen, Xuzhi Hu, Meng Xiao, Chen Wang, Fang Yao, Jing Li, Haibing Wang, Jingwang He, Bo Da, Zejun Ding, Weijun Ke, Chen Tao, Guojia FangTrap-induced nonradiative recombination and decomposition are the major limiting factors that hinder the development of mixed-halide wide-bandgap perovskite solar cells. Specifically, the incorporation of formamidinium (FA+) and bromide in wide-bandgap (WBG) perovskite materials leads to shallow-energy-level traps and inferior light stability. Herein, the electron-withdrawing molecule 2,3,5,6 tetrafluoro-7 ...
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