@article{Jin2024, 
author = {Yongbin Jin and Huiping Feng and Zheng Fang and Liu Yang and Kaikai Liu and Bingru Deng and Jingfu Chen and Xueling Chen and Yawen Zhong and Jinxin Yang and Chengbo Tian and Liqiang Xie and Zhanhua Wei},
title = {Stabilizing semi-transparent perovskite solar cells with a polymer composite hole transport layer},
year = {2024},
journal = {Nano Research},
volume = {17},
number = {3},
pages = {1500-1507},
keywords = {building integrated photovoltaics, semi-transparent solar cells, composite hole transport layer, π-conjugated polymer},
url = {https://www.sciopen.com/article/10.1007/s12274-023-5975-5},
doi = {10.1007/s12274-023-5975-5},
abstract = {Semi-transparent perovskite solar cells (ST-PSCs) have broad applications in building integrated photovoltaics. However, the stability of ST-PSCs needs to be improved, especially in n-i-p ST-PSCs since the doped 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9'-spirobifluorene (Spiro-OMeTAD) is unstable at elevated temperatures and high humidity. In this work, a π-conjugated polymer poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophene-2-yl)-benzo[1,2-b:4,5-b']dithiophene))-alt-(5,5-(1',3'-di-2-thienyl-5',7'-bis(2-ethylhexyl)benzo[1',2'-c:4',5'-c']dithiophene-4,8-dione)] (PBDB-T) is selected to form a polymer composite hole transport layer (HTL) with Spiro-OMeTAD. The sulfur atom of the thiophene unit and the carbonyl group of the polymer interact with the undercoordinated Pb2+ at the perovskite surface, which stabilizes the perovskite/HTL interface and passivates the interfacial defects. The incorporation of the polymer also increases the glass transition temperature and the moisture resistance of Spiro-OMeTAD. As a result, we obtain ST-PSCs with a champion efficiency of 13.71% and an average visible light transmittance of 36.04%. Therefore, a high light utilization efficiency of 4.94% can be obtained. Moreover, the encapsulated device can maintain 84% of the initial efficiency after 751 h under continuous one-sun illumination (at 30% relative humidity) at the open circuit and the unencapsulated device can maintain 80% of the initial efficiency after maximum power tracking for more than 1250 h under continuous one-sun illumination.}
}