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Enhanced Carrier Diffusion Enables Efficient Back-Contact Perovskite Photovoltaics |
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| Authors: | Boya Zhao Dr Lara V Gillan Dr Andrew D Scully Dr Anthony S R Chesman Dr Boer Tan Dr Xiongfeng Lin Dr Jingying Liu Dr Kevin J Rietwyk Siqi Deng Dr Christopher Bailey Prof Yi-Bing Cheng Prof Dane R McCamey Prof Udo Bach |
| Institution: | 1. Department of Chemical and Biological Engineering, Monash University, Victoria, 3800 Australia
ARC Centre of Excellence in Exciton Science, Australia;2. ARC Centre of Excellence in Exciton Science, Australia School of Physics, University of New South Wales, New South Wales, 2052 Australia;3. CSIRO Manufacturing, Victoria, 3168 Australia;4. Department of Materials Science and Engineering, Monash University, Victoria, 3800 Australia;5. Department of Materials Science and Engineering, Monash University, Victoria, 3800 Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China Foshan Xianhu Laboratory, Foshan, 528216 China;6. Department of Chemical and Biological Engineering, Monash University, Victoria, 3800 Australia |
| Abstract: | Back-contact architectures offer a promising route to improve the record efficiencies of perovskite solar cells (PSCs) by eliminating parasitic light absorption. However, the performance of back-contact PSCs is limited by inadequate carrier diffusion in perovskite. Here, we report that perovskite films with a preferred out-of-plane orientation show improved carrier dynamic properties. With the addition of guanidine thiocyanate, the films exhibit carrier lifetimes and mobilities increased by 3–5 times, leading to diffusion lengths exceeding 7 μm. The enhanced carrier diffusion results from substantial suppression of nonradiative recombination and improves charge collection. Devices using such films achieve reproducible efficiencies reaching 11.2 %, among the best performances for back-contact PSCs. Our findings demonstrate the impact of carrier dynamics on back-contact PSCs and provide the basis for a new route to high-performance back-contact perovskite optoelectronic devices at low cost. |
| Keywords: | Back-Contact Architecture Carrier Dynamics Crystallographic Orientation Guanidine Thiocyanate Perovskite Solar Cells |