Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells

Author:

Fei Chengbin1ORCID,Kuvayskaya Anastasia2ORCID,Shi Xiaoqiang1ORCID,Wang Mengru1ORCID,Shi Zhifang1ORCID,Jiao Haoyang1ORCID,Silverman Timothy J.3ORCID,Owen-Bellini Michael3ORCID,Dong Yifan4ORCID,Xian Yeming5ORCID,Scheidt Rebecca4ORCID,Wang Xiaoming5ORCID,Yang Guang1ORCID,Gu Hangyu1ORCID,Li Nengxu1,Dolan Connor J.6ORCID,Deng Zhewen J. D.6ORCID,Cakan Deniz N.6ORCID,Fenning David P.6ORCID,Yan Yanfa5ORCID,Beard Matthew C.4ORCID,Schelhas Laura T.3ORCID,Sellinger Alan24ORCID,Huang Jinsong17ORCID

Affiliation:

1. Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

2. Department of Chemistry, Colorado School of Mines, Golden, CO 80401, USA.

3. Materials, Chemicals, and Computational Science Directorate, National Renewable Energy Laboratory, Golden, CO 80401, USA.

4. Chemistry and Nanoscience Center, National Renewable Energy Laboratory, Golden, CO 80401, USA.

5. Department of Physics and Astronomy, University of Toledo, Toledo, OH 43606, USA.

6. Department of Nanoengineering, University of California San Diego, La Jolla, CA 92093, USA.

7. Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Abstract

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.

Publisher

American Association for the Advancement of Science (AAAS)

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