Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite
Abstract
Shallow defects are mostly benign in covalent semiconductors, such as silicon, given that they do not constitute non-radiative recombination sites. In contrast, the existence of shallow defects in ionic perovskite crystals might have significant repercussions on the long-term stability of perovskite solar cells (PSCs) because of the metastability of the ubiquitous formamidinium lead triiodide (FAPbI3) perovskite and the migration of charged point defects. Here, we show that shallow iodine interstitial defects (Ii) can be generated unintentionally during commonly used post-fabrication treatments, which can lower the cubic-to-hexagonal transformation barrier of FAPbI3-based perovskites to accelerate its phase degradation. We demonstrate that concurrently avoiding the generation of Ii and the more effective passivation of iodine vacancies (VI) can improve the thermodynamic stability of the films and operational stability of the PSCs. In conclusion, our most stable PSC retained 92.1 % of its initial performance after nearly 1,000 h of continuous illumination operational stability testing.
- Authors:
- Publication Date:
- Research Org.:
- Univ. of California, Los Angeles, CA (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1831313
- Alternate Identifier(s):
- OSTI ID: 1663202; OSTI ID: 1720181
- Grant/Contract Number:
- EE0008751
- Resource Type:
- Published Article
- Journal Name:
- Joule
- Additional Journal Information:
- Journal Name: Joule Journal Volume: 4 Journal Issue: 11; Journal ID: ISSN 2542-4351
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; defects; perovskite; iodine interstitial; iodine vacancy; shallow defects; surface treatment; passivation; trifluoroacetate; formamidinium; stability
Citation Formats
Tan, Shaun, Yavuz, Ilhan, Weber, Marc H., Huang, Tianyi, Chen, Chung-Hao, Wang, Rui, Wang, Hao-Cheng, Ko, Jeong Hoon, Nuryyeva, Selbi, Xue, Jingjing, Zhao, Yepin, Wei, Kung-Hwa, Lee, Jin-Wook, and Yang, Yang. Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite. United States: N. p., 2020.
Web. doi:10.1016/j.joule.2020.08.016.
Tan, Shaun, Yavuz, Ilhan, Weber, Marc H., Huang, Tianyi, Chen, Chung-Hao, Wang, Rui, Wang, Hao-Cheng, Ko, Jeong Hoon, Nuryyeva, Selbi, Xue, Jingjing, Zhao, Yepin, Wei, Kung-Hwa, Lee, Jin-Wook, & Yang, Yang. Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite. United States. https://doi.org/10.1016/j.joule.2020.08.016
Tan, Shaun, Yavuz, Ilhan, Weber, Marc H., Huang, Tianyi, Chen, Chung-Hao, Wang, Rui, Wang, Hao-Cheng, Ko, Jeong Hoon, Nuryyeva, Selbi, Xue, Jingjing, Zhao, Yepin, Wei, Kung-Hwa, Lee, Jin-Wook, and Yang, Yang. Sun .
"Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite". United States. https://doi.org/10.1016/j.joule.2020.08.016.
@article{osti_1831313,
title = {Shallow Iodine Defects Accelerate the Degradation of α-Phase Formamidinium Perovskite},
author = {Tan, Shaun and Yavuz, Ilhan and Weber, Marc H. and Huang, Tianyi and Chen, Chung-Hao and Wang, Rui and Wang, Hao-Cheng and Ko, Jeong Hoon and Nuryyeva, Selbi and Xue, Jingjing and Zhao, Yepin and Wei, Kung-Hwa and Lee, Jin-Wook and Yang, Yang},
abstractNote = {Shallow defects are mostly benign in covalent semiconductors, such as silicon, given that they do not constitute non-radiative recombination sites. In contrast, the existence of shallow defects in ionic perovskite crystals might have significant repercussions on the long-term stability of perovskite solar cells (PSCs) because of the metastability of the ubiquitous formamidinium lead triiodide (FAPbI3) perovskite and the migration of charged point defects. Here, we show that shallow iodine interstitial defects (Ii) can be generated unintentionally during commonly used post-fabrication treatments, which can lower the cubic-to-hexagonal transformation barrier of FAPbI3-based perovskites to accelerate its phase degradation. We demonstrate that concurrently avoiding the generation of Ii and the more effective passivation of iodine vacancies (VI) can improve the thermodynamic stability of the films and operational stability of the PSCs. In conclusion, our most stable PSC retained 92.1 % of its initial performance after nearly 1,000 h of continuous illumination operational stability testing.},
doi = {10.1016/j.joule.2020.08.016},
journal = {Joule},
number = 11,
volume = 4,
place = {United States},
year = {Sun Nov 01 00:00:00 EDT 2020},
month = {Sun Nov 01 00:00:00 EDT 2020}
}
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