期刊
ACS APPLIED ENERGY MATERIALS
卷 3, 期 7, 页码 6853-6859出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.0c00956
关键词
perovskite solar cell; PTAA; molecular weight; charge extraction; photo-induced transient photovoltage
资金
- European Union [764047]
- Ministry of Science and Higher Education of the Russian Federation [K2-2019-013]
- MINECO
- AGAUR [CTQ2013-47183, CTQ 2017-89814-P, 2017-SGR-00978]
- ICIQ
- ICREA
The PTAA polymer (poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine]) is often used as a hole transport material (HTM) for high-efficiency perovskite solar cells (PSCs). However, there are great differences within the solar cell efficiencies reported. Herein, we show that when increasing PTAA molecular weight (MW) from 10 to 115 kDa, the power conversion efficiency also increases. We analyze how the differences in MW influence the interfacial carrier losses in the PSCs under operando conditions using advanced photoinduced spectroscopic techniques. Moreover, we compare kinetics and structural/morphological effects by studying different PTAA MW films. Our results show that the observed differences within the reported PSC efficiencies are due to the differences in carrier recombination kinetics, which are influenced by the differences in the polymer MW.
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