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Transporting holes stably under iodide invasion in efficient perovskite solar cells.

Authors :
Tao Wang
Yao Zhang
Weiyu Kong
Liang Qiao
Bingguo Peng
Zhichao Shen
Qifeng Han
Han Chen
Zhiliang Yuan
Rongkun Zheng
Xudong Yang
Source :
Science. 9/9/2022, Vol. 377 Issue 6611, p1227-1232. 6p. 1 Color Photograph, 3 Graphs.
Publication Year :
2022

Abstract

Highly efficient halide perovskite solar cells generally rely on lithium-doped organic hole transporting layers that are thermally and chemically unstable, in part because of migration of iodide anions from the perovskite layer. We report a solution strategy to stabilize the hole transport in organic layers by ionic coupling positive polymer radicals and molecular anions through an ion-exchange process. The target layer exhibited a hole conductivity that was 80 times higher than that of the conventional lithium-doped layer. Moreover, after extreme iodide invasion caused by light-soaking at 85°C for 200 hours, the target layer maintained high hole conductivity and well-matched band alignment. This ion-exchange strategy enabled fabrication of perovskite solar cells with a certified power conversion efficiency of 23.9% that maintained 92% under standard illumination at 85°C after 1000 hours. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00368075
Volume :
377
Issue :
6611
Database :
Academic Search Index
Journal :
Science
Publication Type :
Academic Journal
Accession number :
158972165
Full Text :
https://doi.org/10.1126/science.abq6235