Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells
The light-emitting diodes (LEDs) used in indoor testing of perovskite solar cells do not expose them to the levels of ultraviolet (UV) radiation that they would receive in actual outdoor use. We report degradation mechanisms of p-i-n-structured perovskite solar cells under unfiltered sunlight and with LEDs. Weak chemical bonding between perovskites and polymer hole-transporting materials (HTMs) and transparent conducting oxides (TCOs) dominate the accelerated A-site cation migration, rather than direct degradation of HTMs. An aromatic phosphonic acid, [2-(9-ethyl-9H-carbazol-3-yl)ethyl]phosphonic acid (EtCz3EPA), enhanced bonding at the perovskite/HTM/TCO region with a phosphonic acid group bonded to TCOs and a nitrogen group interacting with lead in perovskites. A hybrid HTM of EtCz3EPA with strong hole-extraction polymers retained high efficiency and improved the UV stability of perovskite devices, and a champion perovskite minimodule-independently measured by the Perovskite PV Accelerator for Commercializing Technologies (PACT) center-retained operational efficiency of >16% after 29 weeks of outdoor testing.
Authors
- Laura T. Schelhas (ORCID: https://orcid.org/0000-0003-2299-1864)
- Haoyang Jiao (ORCID: https://orcid.org/0000-0003-2563-1581)
- Guang Yang (ORCID: https://orcid.org/0000-0003-0994-9178)
- Connor J. Dolan (ORCID: https://orcid.org/0000-0001-6503-9043)
- Deniz N. Cakan (ORCID: https://orcid.org/0000-0001-5177-8654)
- Alan Sellinger (ORCID: https://orcid.org/0000-0001-6705-1548)
- Nengxu Li (ORCID: https://orcid.org/0000-0003-2430-8037)
- Timothy J. Silverman (ORCID: https://orcid.org/0000-0003-4951-7994)
- David P. Fenning (ORCID: https://orcid.org/0000-0002-4609-9312)
- Yeming Xian (ORCID: https://orcid.org/0000-0002-6709-705X)
- Hangyu Gu (ORCID: https://orcid.org/0000-0003-0378-9185)
- Chengbin Fei (ORCID: https://orcid.org/0000-0002-8981-091X)
- Mengru Wang (ORCID: https://orcid.org/0000-0003-1864-2207)
- Yifan Dong (ORCID: https://orcid.org/0000-0003-2912-3322)
- Rebecca A. Scheidt (ORCID: https://orcid.org/0000-0001-7715-3396)
- Jinsong Huang (ORCID: https://orcid.org/0000-0002-0509-8778)
- Michael Owen‐Bellini (ORCID: https://orcid.org/0000-0002-4551-8124)
- Anastasia Kuvayskaya (ORCID: https://orcid.org/0009-0007-8135-7106)
- Matthew C. Beard (ORCID: https://orcid.org/0000-0002-2711-1355)
- Xiaoqiang Shi (ORCID: https://orcid.org/0000-0003-0284-9588)
- Zhifang Shi (ORCID: https://orcid.org/0000-0003-1673-0983)
- Yanfa Yan (ORCID: https://orcid.org/0000-0003-3977-5789)
- Xiaoming Wang (ORCID: https://orcid.org/0000-0002-5438-1334)
- Zhewen J. D. Deng (ORCID: https://orcid.org/0000-0001-8009-7102)
Institutions
- University of North Carolina at Chapel Hill (US)
Publication Details
- Journal
- UNC Libraries
- Published
- 2025-10-04
- DOI
- https://doi.org/10.17615/7qft-ym77
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00