High-performance formamidinium-based perovskite solar cells via microstructure-mediated δ-to-α phase transformation
Abstract
The δ → α phase transformation is a crucial step in the solution-growth process of formamidinium-based lead triiodide (FAPbI3) hybrid organic–inorganic perovskite (HOIP) thin films for perovskite solar cells (PSCs). Because the addition of cesium (Cs) stabilizes the α phase of FAPbI3-based HOIPs, here our research focuses on FAPbI3(Cs) thin films. We show that having a large grain size in the δ-FAPbI3(Cs) non-perovskite intermediate films is essential for the growth of high-quality α-FAPbI3(Cs) HOIP thin films. Here grain coarsening and phase transformation occur simultaneously during the thermal annealing step. A large starting grain size in the δ-FAPbI3(Cs) thin films suppresses grain coarsening, precluding the formation of voids at the final α-FAPbI3(Cs)–substrate interfaces. PSCs based on the interface void-free α-FAPbI3(Cs) HOIP thin films are much more efficient and stable in the ambient atmosphere. This interesting finding inspired us to develop a simple room-temperature aging method for preparing coarse-grained δ-FAPbI3(Cs) intermediate films, which are subsequently converted to coarse-grained, high-quality α-FAPbI3(Cs) HOIP thin films. As a result, this study highlights the importance of microstructure meditation in the processing of formamidinium-based PSCs.
- Authors:
-
[4];
- Peking Univ., Beijing (China); Brown Univ., Providence, RI (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Brown Univ., Providence, RI (United States); Qingdao Univ. of Science and Technology, Qingdao (People's Republic of China)
- Brown Univ., Providence, RI (United States)
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Peking Univ., Beijing (China); Shanxi Univ., Shanxi (People's Republic of China)
- Publication Date:
- Research Org.:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- OSTI Identifier:
- 1358335
- Report Number(s):
- NREL/JA-5900-68540
Journal ID: ISSN 0897-4756
- Grant/Contract Number:
- AC36-08GO28308
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Chemistry of Materials
- Additional Journal Information:
- Journal Volume: 29; Journal Issue: 7; Journal ID: ISSN 0897-4756
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 14 SOLAR ENERGY; 36 MATERIALS SCIENCE; phase transformation; organic-inorganic; perovskite thin films; solar cells
Citation Formats
Liu, Tanghao, Zong, Yingxia, Zhou, Yuanyuan, Yang, Mengjin, Li, Zhen, Game, Onkar S., Zhu, Kai, Zhu, Rui, Gong, Qihuang, and Padture, Nitin P. High-performance formamidinium-based perovskite solar cells via microstructure-mediated δ-to-α phase transformation. United States: N. p., 2017.
Web. doi:10.1021/acs.chemmater.7b00523.
Liu, Tanghao, Zong, Yingxia, Zhou, Yuanyuan, Yang, Mengjin, Li, Zhen, Game, Onkar S., Zhu, Kai, Zhu, Rui, Gong, Qihuang, & Padture, Nitin P. High-performance formamidinium-based perovskite solar cells via microstructure-mediated δ-to-α phase transformation. United States. https://doi.org/10.1021/acs.chemmater.7b00523
Liu, Tanghao, Zong, Yingxia, Zhou, Yuanyuan, Yang, Mengjin, Li, Zhen, Game, Onkar S., Zhu, Kai, Zhu, Rui, Gong, Qihuang, and Padture, Nitin P. Tue .
"High-performance formamidinium-based perovskite solar cells via microstructure-mediated δ-to-α phase transformation". United States. https://doi.org/10.1021/acs.chemmater.7b00523. https://www.osti.gov/servlets/purl/1358335.
@article{osti_1358335,
title = {High-performance formamidinium-based perovskite solar cells via microstructure-mediated δ-to-α phase transformation},
author = {Liu, Tanghao and Zong, Yingxia and Zhou, Yuanyuan and Yang, Mengjin and Li, Zhen and Game, Onkar S. and Zhu, Kai and Zhu, Rui and Gong, Qihuang and Padture, Nitin P.},
abstractNote = {The δ → α phase transformation is a crucial step in the solution-growth process of formamidinium-based lead triiodide (FAPbI3) hybrid organic–inorganic perovskite (HOIP) thin films for perovskite solar cells (PSCs). Because the addition of cesium (Cs) stabilizes the α phase of FAPbI3-based HOIPs, here our research focuses on FAPbI3(Cs) thin films. We show that having a large grain size in the δ-FAPbI3(Cs) non-perovskite intermediate films is essential for the growth of high-quality α-FAPbI3(Cs) HOIP thin films. Here grain coarsening and phase transformation occur simultaneously during the thermal annealing step. A large starting grain size in the δ-FAPbI3(Cs) thin films suppresses grain coarsening, precluding the formation of voids at the final α-FAPbI3(Cs)–substrate interfaces. PSCs based on the interface void-free α-FAPbI3(Cs) HOIP thin films are much more efficient and stable in the ambient atmosphere. This interesting finding inspired us to develop a simple room-temperature aging method for preparing coarse-grained δ-FAPbI3(Cs) intermediate films, which are subsequently converted to coarse-grained, high-quality α-FAPbI3(Cs) HOIP thin films. As a result, this study highlights the importance of microstructure meditation in the processing of formamidinium-based PSCs.},
doi = {10.1021/acs.chemmater.7b00523},
journal = {Chemistry of Materials},
number = 7,
volume = 29,
place = {United States},
year = {Tue Mar 14 00:00:00 EDT 2017},
month = {Tue Mar 14 00:00:00 EDT 2017}
}
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