Efficient Inverted Perovskite Solar Cells with Low Voltage Loss Achieved by a Pyridine‐Based Dopant‐Free Polymer Semiconductor
Abstract
Currently, the performance improvement for inverted perovskite solar cells (PVSCs) is mainly limited by the high open circuit voltage (VOC) loss caused by detrimental non‐radiative recombination (NRR) processes. Herein, we report a simple and efficient way to simultaneously reduce the NRR processes inside perovskites and at the interface by rationally designing a new pyridine‐based polymer hole‐transporting material (HTM),PPY2, which exhibits suitable energy levels with perovskites, high hole mobility, effective passivation of the uncoordinated Pb2+and iodide defects, as well as the capability of promoting the formation of high‐quality polycrystalline perovskite films. In absence of any dopants, the inverted PVSCs usingPPY2as the HTM deliver an encouraging PCE up to 22.41 % with a smallVOCloss (0.40 V), among the best device performances for inverted PVSCs reported so far. Furthermore,PPY2‐based unencapsulated devices show an excellent long‐term photostability, and over 97 % of its initial PCE can be maintained after one sun constant illumination for 500 h.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 18, 2021
- Source ID
- 10.1002/anie.202016085
Entities
People
- Alex K.‐y. Jen
- Cheng Zhong
- Dangyuan Lei
- Danjun Liu
- Xianglang Sun
- Xin Wu
- Xinyu Yu
- Zhen Li
- Zhong'an Li
- Zonglong Zhu
Organizations
- Air Force Office of Scientific Research
- City University of Hong Kong
- Huazhong University of Science and Technology
- National Natural Science Foundation of China
- Wuhan University