Constructing an n/n+ homojunction in a monolithic perovskite film for boosting charge collection in inverted perovskite photovoltaics
| Autor: | Yan-Na Lu, Meifang Yang, Yinye Yu, Xingzhan Wei, Ying Tan, Yecheng Zhou, Wu-Qiang Wu, Jun-Xing Zhong, Yong Jiang, Chengxi Zhang, Wenhuai Feng, Xi Chen, Chan-Ying Yao, Lianzhou Wang, Li Gong |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment business.industry Doping Energy conversion efficiency Halide 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Pollution 0104 chemical sciences Nuclear Energy and Engineering Photovoltaics Electric field Environmental Chemistry Surface modification Optoelectronics Homojunction 0210 nano-technology business Perovskite (structure) |
| Zdroj: | Energy & Environmental Science. 14:4048-4058 |
| ISSN: | 1754-5706 1754-5692 |
| DOI: | 10.1039/d1ee00918d |
| Popis: | The suboptimal carrier dynamics at the perovskite/electron transport layer has largely limited the further performance enhancement of the state-of-the-art inverted p-i-n structured perovskite solar cells. Herein, we discovered that a simple surface modification of the perovskite film by a trivalent metal halide salt, InBr3, could convert the doping levels of the top surface to be more n-type, which spontaneously formed an intriguing n/n+ homojunction between the bulk (weak n type (n) component) and the surface (more n-type (n+) component) in a monolithic perovskite film. This brought about synergistic advantages of the enlarged built-in electric field for facilitated charge separation, as well as optimized electronic energy level alignment and minimized electron injection barrier at the perovskite/C60 interface, leading to both accelerated charge extraction and suppressed interfacial charge recombination. Blade-coated inverted PSCs with n/n+ homojunctions achieved a high power conversion efficiency (PCE) of up to 22.2%, narrowing the efficiency gap with their conventional n-i-p counterparts. The InBr3 surface treatment also improved the operational stability to >1000 hours under light with 93% initial efficiency retained. |
| Databáze: | OpenAIRE |
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