Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines
Abstract
Large‐bandgap perovskites offer a route to improve the efficiency of energy capture in photovoltaics when employed in the front cell of perovskite–silicon tandems. Implementing perovskites as the front cell requires an inverted (p–i–n) architecture; this architecture is particularly effective at harnessing high‐energy photons and is compatible with ionic‐dopant‐free transport layers. Here, a power conversion efficiency of 21.6% is reported, the highest among inverted perovskite solar cells (PSCs). Only by introducing a secondary amine into the perovskite structure to form MA1−xDMAxPbI3 (MA is methylamine and DMA is dimethylamine) are defect density and carrier recombination suppressed to enable record performance. It is also found that the controlled inclusion of DMA increases the hydrophobicity and stability of films in ambient operating conditions: encapsulated devices maintain over 80% of their efficiency following 800 h of operation at the maximum power point, 30 times longer than reported in the best prior inverted PSCs. The unencapsulated devices show record operational stability in ambient air among PSCs.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 30, 2019
- Source ID
- 10.1002/adma.201903559
Entities
People
- Andrew Johnston
- Edward H. Sargent
- Fei Wang
- Hao Chen
- Jiangyu Li
- Kaimin Xu
- Lu Qiao
- Makhsud I Saidaminov
- Qi Wei
- Run Long
- Siwen Xu
- Wenjia Zhou
- Xiao Wang
- Yi Hou
- Youqi Ke
- Zhenghao Liu
- Zhijun Ning
- Zijian Peng
Organizations
- Beijing Normal University
- Office of Naval Research
- Shanghai Institute of Ceramics
- ShanghaiTech University
- Shenzhen Institutes of Advanced Technology
- University of Chinese Academy of Sciences
- University of Toronto
- University of Washington