Photo-doping of spiro-OMeTAD for highly stable and efficient perovskite solar cells

Kim, Seul-Gi; Fish, George C.; Socie, Etienne; Terpstra, Aaron T.; Park, Dong-Am; Zhu, Kai; Grätzel, Michael; Moser, Jacques -E.; Park, Nam-Gyu

doi:10.1016/j.joule.2024.03.012

Title: Photo-doping of spiro-OMeTAD for highly stable and efficient perovskite solar cells

Journal Article · 15 April 2024 · Joule

DOI: https://doi.org/10.1016/j.joule.2024.03.012 · OSTI ID:2361057

Kim, Seul-Gi ^[1]; Fish, George C. ^[2]; Socie, Etienne ^[2]; Terpstra, Aaron T. ^[2]; Park, Dong-Am ^[3]; Zhu, Kai ^[4]; Grätzel, Michael ^[2]; Moser, Jacques -E. ^[2];

^[3]

National Renewable Energy Laboratory (NREL), Golden, CO (United States); Sungkyunkwan Univ., Suwon (Republic of Korea)
Ecole Polytechnique Federale Lausanne (EPFL) (Switzerland)
Sungkyunkwan Univ., Suwon (Republic of Korea)
National Renewable Energy Laboratory (NREL), Golden, CO (United States)

A widely used component of high-efficiency perovskite solar cells (PSCs) is the molecular hole-transport material (HTM) spiro-OMeTAD. This organic solid needs to be p-doped to acquire sufficient hole conductivity. However, the conventional doping method using LiTFSI in the air is slow, sensitive to the environment, and may lead to the deterioration of the PSCs by unintended oxidation or dopant migration. It is thus highly desirable to develop fast doping approaches that avoid exposing the PSC to ambient air and easy-to-move dopant ions. Here, we report here that light absorption by spiro-OMeTAD itself triggers redox photochemistry that has so far been ignored. Strikingly, we found that Y(III) or La(III)-tBP complexes catalyze the symmetry-breaking charge separation of photo-excited spiro-OMeTAD, resulting in the efficient p-doping of the HTM. Using this photo-redox process, we realize PSCs with superior stability over cells using conventional doping that show no degradation under continuous illumination over 1,000 h.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office; Swiss National Science Foundation (SNF); National Research Foundation of Korea (NRF)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2361057

Report Number(s):: NREL/JA--5900-89954; MainId:90733; UUID:5e29833c-02d5-4565-a0eb-c486de0595dd; MainAdminId:72651

Journal Information:: Joule, Journal Name: Joule Journal Issue: 6 Vol. 8; ISSN 2542-4351

Publisher:: Elsevier - Cell PressCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Photo-doping of spiro-OMeTAD for highly stable and efficient perovskite solar cells

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