Abstract
Although perovskite solar cells (PSCs) have achieved encouraging efficiency, the photon loss at the substrate due to light reflection has not been well addressed. Light management is promising to reduce reflection loss and realize higher power conversion efficiency (PCE) of PSCs. Here, a bilayer antireflective coating (ARC) has been designed and coated onto the backside of the glass substrate of (FAPbI3)x-(MAPbBr3)1_x PSCs to enhance photon harvesting and consequently the device efficiency. The bottom layer of the bilayer ARC is made from a silica polymer and the top layer is made from the mixture of hexamethyldisiloxane-modified mesoporous silica nanoparticles and a fluorinated silica polymer. By adjusting the refractive index and the film thickness of each layer according to a two-layer model, enhanced glass trans-mittance in a broadband wavelength range can be reached, with the maximum transmittance increasing from ca. 90% to over 95%. With the bilayer ARC, the maximum short-circuit current density and PCE of (FAPbI3)x(MAPbBr3)1-x PSCs can be increased from 25.5 mA cm-2 and 22.7% to 26.5 mA cm-2 and 23.9% with negligible changes in fill factor and open-circuit voltage. This work presents a simple yet effective strategy to enhance the efficiency of solar cells employing bilayer antirefective coatings, which can be applied to other types of solar cells.
摘要
虽然钙钛矿太阳能电池效率的发展令人鼓舞, 但是由于光反射造成的器件基底界面的光子损失等问题仍然没有解决. 光管理是降低反射损失并提高器件效率的有效途径. 因此, 我们设计了双层减反膜以涂敷在(FAPbI3)x(MAPbB3)1-x钙钛矿太阳能电池的玻璃基底外侧, 以期达到增加光吸收和提高器件效率目的. 该研究中的减反膜底层由硅聚合物构成,上层由氟代硅聚合物和六甲基二硅氧烷/介孔二氧化硅纳米粒子复合而成. 通过精确调控上下层的折射率及厚度, 我们在宽波段范围内实现了玻璃基底透过率从最高约90%显著提升到95%. 在电池器件的玻璃基底外侧溶液涂膜制备减反膜后, (FAPbI3)x(MAPbBr3)1-x钙钛矿太阳能电池在保持填充因子和开路电压不变的情况下, 短路电流和效率分别从25.5 mA cm-2和22.7%提高到26.5 mA cm-2和23.9%. 本研究提出了一种简单、高效的通过双层减反膜的光管理提高太阳能电池效率的方法, 且此方法可拓展到其他类型太阳能电池体系.
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References
Stoumpos CC, Malliakas CD, Kanatzidis MG. Semiconducting tin and lead iodide perovskites with organic cations: Phase transitions, high mobilities, and near-infrared photoluminescent properties. Inorg Chem, 2013, 52: 9019–9038
Fang Y, Bi C, Wang D, et al. The functions of fullerenes in hybrid perovskite solar cells. ACS Energy Lett, 2017, 2: 782–794
NREL, https://www.nrel.gov/pv/assets/pdfs/best-reserch-cell-effi-ciencies.pdf (Last access in Feb, 2020)
Wang P, Li R, Chen B, et al. Gradient energy alignment engineering for planar perovskite solar cells with efficiency over 23%. Adv Mater, 2020, 32: 1905766
Gong X, Sun Q, Liu S, et al. Highly efficient perovskite solar cells with gradient bilayer electron transport materials. Nano Lett, 2018, 18: 3969–3977
Kim H, Lim KG, Lee TW. Planar heterojunction organometal halide perovskite solar cells: Roles of interfacial layers. Energy Environ Sci, 2016, 9: 12–30
Chang CY, Chu CY, Huang YC, et al. Tuning perovskite morphology by polymer additive for high efficiency solar cell. ACS Appl Mater Interfaces, 2015, 7: 4955–4961
Chiang CH, Wu CG. Bulk heterojunction perovskite-PCBM solar cells with high fill factor. Nat Photon, 2016, 10: 196–200
Sun C, Xue Q, Hu Z, et al. Phosphonium halides as both processing additives and interfacial modifiers for high performance pla-nar-heterojunction perovskite solar cells. Small, 2015, 11: 3344–3350
Chen Q, Zhou H, Song TB, et al. Controllable self-induced passivation of hybrid lead iodide perovskites toward high performance solar cells. Nano Lett, 2014, 14: 4158–4163
Wang L, McCleese C, Kovalsky A, et al. Femtosecond time-resolved transient absorption spectroscopy of CH3NH3PbI3 perovskite films: evidence for passivation effect of Pbl2. J Am Chem Soc, 2014, 136: 12205–12208
Jiang Q, Chu Z, Wang P, et al. Planar-structure perovskite solar cells with efficiency beyond 21%. Adv Mater, 2017, 29: 1703852
Kim M, Kim GH, Lee TK, et al. Methylammonium chloride induces intermediate phase stabilization for efficient perovskite solar cells. Joule, 2019, 3: 2179–2192
Jiang Q, Zhao Y, Zhang X, et al. Surface passivation of perovskite film for efficient solar cells. Nat Photonics, 2019, 13: 460–466
Luo X, Gao Y, Zhu P, et al. Record photocurrent density over 26 mA cm in planar perovskite solar cells enabled by antire-flective cascaded electron transport layer. Sol RRL, 2020, 4: 2000169
Deng K, Li L. Optical design in perovskite solar cells. Small Methods, 2020, 4: 1900150
Wang Y, Chen M, Li D, et al. Mesoporous silica hybrids as an antireflective coating to enhance light harvesting and achieve over 16% efficiency of organic solar cells. J Mater Chem C, 2019, 7: 14962–14969
Moghal J, Kobler J, Sauer J, et al. High-performance, single-layer antireflective optical coatings comprising mesoporous silica na-noparticles. ACS Appl Mater Interfaces, 2012, 4: 854–859
Keshavarz Hedayati M, Elbahri M. Antireflective coatings: Conventional stacking layers and ultrathin plasmonic metasurfaces, a mini-review. Materials, 2016, 9: 497
Chen D. Anti-reflection (AR) coatings made by sol-gel processes: A review. Sol Energy Mater Sol Cells, 2001, 68: 313–336
Raut HK, Ganesh VA, Nair AS, et al. Anti-reflective coatings: A critical, in-depth review. Energy Environ Sci, 2011, 4: 3779–3804
Tavakoli MM, Tsui KH, Zhang Q, et al. Highly efficient flexible perovskite solar cells with antireflection and self-cleaning nano-structures. ACS Nano, 2015, 9: 10287–10295
Dudem B, Heo JH, Leem JW, et al. CH3NH3PbI3 planar perovskite solar cells with antireflection and self-cleaning function layers. Mater Chem A, 2016, 4: 7573–7579
Ye L, Zhang Y, Zhang X, et al. Sol-gel preparation of Si02/Ti02/ SiO2-TiO2 broadband antireflective coating for solar cell cover glass. Sol Energy Mater Sol Cells, 2013, 111: 160–164
Ye L, Zhang X, Zhang Y, et al. Three-layer tri-wavelength broadband antireflective coatings built from refractive indices controlled silica thin films. J Sol-Gel Sci Technol, 2016, 80: 1–9
Cox JT, Hass G, Thelen A. Triple-layer antireflection coatings on glass for the visible and near infrared. J Opt Soc Am, 1962, 52: 965
Lien S, Wuu D, Yeh W, et al. Tri-layer antireflection coatings (SiO2/SiO2-TiO2/TiO2) for silicon solar cells using a sol-gel technique. Sol Energy Mater Sol Cells, 2006, 90: 2710–2719
Kavakli IG, Kantarli K. Single and double-layer antireflection coatings on silicon. Turkish J Phys, 2002, 26: 349–354
Li X, Shen J. A scratch-resistant and hydrophobic broadband antireflective coating by sol-gel method. Thin Solid Films, 2011, 519: 6236–6240
Prene P, Priotton JJ, Beaurain L, et al. Preparation of a sol-gel broadband antireflective and scratch-resistant coating for amplifier blastshields of the French laser LIL. J Sol-Gel Sci Tech, 2000, 19: 533–537
Yang G, Chen C, Yao F, et al. Effective carrier-concentration tuning of SnO2 quantum dot electron-selective layers for high-performance planar perovskite solar cells. Adv Mater, 2018, 30: 1706023
MacLeod HA. Thin-Film Optical Filters. 4nd Edition. Boca Raton: CRC Press, 2010
Wang X, Zhao H, Cao Y, et al. Sol-gel preparation of laser damage resistant and moisture-proof antireflective coatings for KDP crystals. Langmuir, 2018, 34: 10262–10269
Koo H, Yi D, Yoo S, et al. A Snowman-like array of colloidal dimers for antireflecting surfaces. Adv Mater, 2004, 16: 274–277
Zhang XX, Cai S, You D, et al. Template-free sol-gel preparation of superhydrophobic ORMOSIL films for double-wavelength broadband antireflective coatings. Adv Funct Mater, 2013, 23: 4361–4365
Wang H, Li F, Wang P, et al. Chlorinated fullerene dimers for interfacial engineering toward stable planar perovskite solar cells with 22.3% efficiency. Adv Energy Mater, 2020, 10: 2000615
Zimmermann E, Ehrenreich P, Pfadler T, et al. Erroneous efficiency reports harm organic solar cell research. Nat Photon, 2014, 8: 669–672
Acknowledgements
This work was supported by the Natural Science Foundation of Hubei Province (2019CFB575), and the National Natural Science Foundation of China (51861145101).
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Wang Y synthesized and prepared the ARC coating. Wang H, Chen M and Wang P fabricated the solar cell devices. Mao Y and Han W characterized the film morphology. Liu D and Wang T conceived the idea. All authors discussed the results and approved the manuscript.
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The authors declare no competing interest.
Yalun Wang received his BE degree in materials science and engineering from Hubei University, China in 2017. He is currently a Master student under the supervision of Dr. Dan Liu at Wuhan University of Technology, and is working on functional coatings to improve the efficiency and lifetime of solar cells.
Dan Liu received her PhD in physics from the University of Surrey, U.K. in 2010. She was a postdoc research associate at the School of Physics and Astronomy, University of Leeds, UK before joining as an associate professor in 2014 in the School of Materials Science and Engineering, Wuhan University of Technology, China. Her research interests are functional thin films for optoelectronic devices.
Hui Wang received her BE degree in materials science and engineering from Wuhan University of Technology, China in 2018. She is currently a PhD student under the supervision of Prof. Tao Wang at Wuhan University of Technology, and is working on perovskite solar cells.
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Wang, Y., Wang, H., Chen, M. et al. Bilayer broadband antireflective coating to achieve planar heterojunction perovskite solar cells with 23.9% efficiency. Sci. China Mater. 64, 789–797 (2021). https://doi.org/10.1007/s40843-020-1478-5
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DOI: https://doi.org/10.1007/s40843-020-1478-5