Highly efficient and stable perovskite solar cells using thionyl chloride as a p-type dopant for spiro-OMeTAD
| Autor: | Qi Chen, Xinpeng Zhang, Yuqian Yang, Qianjin Zhu, Jeng-Yu Lin, Yitian Du, Weihai Sun, Ziruo Li, Xuping Liu, Yanfei Dou, Jihuai Wu |
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| Rok vydání: | 2020 |
| Předmět: |
Electron mobility
Materials science Dopant business.industry Mechanical Engineering Energy conversion efficiency Doping Metals and Alloys 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Thionyl chloride chemistry Mechanics of Materials Electrical resistivity and conductivity Materials Chemistry Optoelectronics 0210 nano-technology business Perovskite (structure) |
| Zdroj: | Journal of Alloys and Compounds. 847:156500 |
| ISSN: | 0925-8388 |
| Popis: | Hole transport materials (HTMs) play an important role in perovskite solar cells (PSCs). At present, the most frequent used HTM is spiro-OMeTAD. However, spiro-OMeTAD without dopants have low electrical conductivity and hole mobility. Therefore, the improvement of mobility and conductivity of hole transport layer (HTL) has become a crucial issue. Here, we introduce a dopant, thionyl chloride (SOCl2), to oxidize spiro-OMeTAD and generate more spiro-OMeTAD+. Under the same conditions, the optimized device doped with SOCl2 achieves a power conversion efficiency (PCE) of 20.76%, while the pristine one is only 18.13%. The doping of SOCl2 not only reduces the density of defect states at the interface between perovskite and HTL, but also suppresses the recombination of light-induced carriers. In addition, the stability of the PSCs based on SOCl2 is greatly improved, which can maintain 90% of the initial PCE for 31 days under ambient conditions. This work provides a simple and feasible strategy for dopant engineering of HTL to achieve efficient PSCs. |
| Databáze: | OpenAIRE |
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