Additive-Modulated Evolution of HC(NH2)2PbI3 Black Polymorph for Mesoscopic Perovskite Solar Cells

Zaiwei Wang; Yuanyuan Zhou; Shuping Pang; Zewen Xiao; Jiliang Zhang; Wenqiang Chai; Hongxia Xu; Zhihong Liu; Nitin P. Padture; Guanglei Cui

doi:10.1021/acs.chemmater.5b03169

Additive-Modulated Evolution of HC(NH₂)₂PbI₃ Black Polymorph for Mesoscopic Perovskite Solar Cells

Zaiwei Wang
, Yuanyuan Zhou
, Shuping Pang
, Zewen Xiao
, Jiliang Zhang
, Wenqiang Chai
, Hongxia Xu
, Zhihong Liu
, Nitin P. Padture
, Guanglei Cui

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

225 Citations (Scopus)

Abstract

Formamidinium lead triiodide (HC(NH₂)₂PbI₃ or FAPbI₃) is gaining increasing interest in the field of mesoscopic perovskite solar cells (PSCs) for its broader light absorption compared with the more widely studied CH₃NH₃PbI₃ (MAPbI₃). Because FAPbI₃ has two polymorphs ("black" α-FAPbI₃ and "yellow" δ-FAPbI₃) at ambient temperature, where α-FAPbI₃ is the desirable photoactive perovskite phase, it becomes particularly important to suppress the formation of the nonperovskite δ-FAPbI₃ for achieving high efficiency in FAPbI₃-based mesoscopic PSCs. In this study, we demonstrate that the judicious use of low-volatility additives in the precursor solution assists in the evolution of α-FAPbI₃ through the formation of non-δ-FAPbI₃ intermediate phases, which then convert to α-FAPbI₃ during thermal annealing. The underlying mechanism involved in the additive-modulated evolution of α-FAPbI₃ upon mesoporous TiO₂ substrates is elucidated, which suggests guidelines for developing protocols for the fabrication efficient FAPbI₃-based mesoscopic PSCs. © 2015 American Chemical Society.

Original language	English
Pages (from-to)	7149-7155
Journal	Chemistry of Materials
Volume	27
Issue number	20
DOIs	https://doi.org/10.1021/acs.chemmater.5b03169
Publication status	Published - 27 Oct 2015

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@article{47afdd9aa0c1432d8087605fe484a941,

title = "Additive-Modulated Evolution of HC(NH2)2PbI3 Black Polymorph for Mesoscopic Perovskite Solar Cells",

abstract = "Formamidinium lead triiodide (HC(NH2)2PbI3 or FAPbI3) is gaining increasing interest in the field of mesoscopic perovskite solar cells (PSCs) for its broader light absorption compared with the more widely studied CH3NH3PbI3 (MAPbI3). Because FAPbI3 has two polymorphs ({"}black{"} α-FAPbI3 and {"}yellow{"} δ-FAPbI3) at ambient temperature, where α-FAPbI3 is the desirable photoactive perovskite phase, it becomes particularly important to suppress the formation of the nonperovskite δ-FAPbI3 for achieving high efficiency in FAPbI3-based mesoscopic PSCs. In this study, we demonstrate that the judicious use of low-volatility additives in the precursor solution assists in the evolution of α-FAPbI3 through the formation of non-δ-FAPbI3 intermediate phases, which then convert to α-FAPbI3 during thermal annealing. The underlying mechanism involved in the additive-modulated evolution of α-FAPbI3 upon mesoporous TiO2 substrates is elucidated, which suggests guidelines for developing protocols for the fabrication efficient FAPbI3-based mesoscopic PSCs. {\textcopyright} 2015 American Chemical Society.",

author = "Zaiwei Wang and Yuanyuan Zhou and Shuping Pang and Zewen Xiao and Jiliang Zhang and Wenqiang Chai and Hongxia Xu and Zhihong Liu and Padture, \{Nitin P.\} and Guanglei Cui",

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T1 - Additive-Modulated Evolution of HC(NH2)2PbI3 Black Polymorph for Mesoscopic Perovskite Solar Cells

AU - Wang, Zaiwei

AU - Zhou, Yuanyuan

AU - Pang, Shuping

AU - Xiao, Zewen

AU - Zhang, Jiliang

AU - Chai, Wenqiang

AU - Xu, Hongxia

AU - Liu, Zhihong

AU - Padture, Nitin P.

AU - Cui, Guanglei

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

PY - 2015/10/27

Y1 - 2015/10/27

N2 - Formamidinium lead triiodide (HC(NH2)2PbI3 or FAPbI3) is gaining increasing interest in the field of mesoscopic perovskite solar cells (PSCs) for its broader light absorption compared with the more widely studied CH3NH3PbI3 (MAPbI3). Because FAPbI3 has two polymorphs ("black" α-FAPbI3 and "yellow" δ-FAPbI3) at ambient temperature, where α-FAPbI3 is the desirable photoactive perovskite phase, it becomes particularly important to suppress the formation of the nonperovskite δ-FAPbI3 for achieving high efficiency in FAPbI3-based mesoscopic PSCs. In this study, we demonstrate that the judicious use of low-volatility additives in the precursor solution assists in the evolution of α-FAPbI3 through the formation of non-δ-FAPbI3 intermediate phases, which then convert to α-FAPbI3 during thermal annealing. The underlying mechanism involved in the additive-modulated evolution of α-FAPbI3 upon mesoporous TiO2 substrates is elucidated, which suggests guidelines for developing protocols for the fabrication efficient FAPbI3-based mesoscopic PSCs. © 2015 American Chemical Society.

AB - Formamidinium lead triiodide (HC(NH2)2PbI3 or FAPbI3) is gaining increasing interest in the field of mesoscopic perovskite solar cells (PSCs) for its broader light absorption compared with the more widely studied CH3NH3PbI3 (MAPbI3). Because FAPbI3 has two polymorphs ("black" α-FAPbI3 and "yellow" δ-FAPbI3) at ambient temperature, where α-FAPbI3 is the desirable photoactive perovskite phase, it becomes particularly important to suppress the formation of the nonperovskite δ-FAPbI3 for achieving high efficiency in FAPbI3-based mesoscopic PSCs. In this study, we demonstrate that the judicious use of low-volatility additives in the precursor solution assists in the evolution of α-FAPbI3 through the formation of non-δ-FAPbI3 intermediate phases, which then convert to α-FAPbI3 during thermal annealing. The underlying mechanism involved in the additive-modulated evolution of α-FAPbI3 upon mesoporous TiO2 substrates is elucidated, which suggests guidelines for developing protocols for the fabrication efficient FAPbI3-based mesoscopic PSCs. © 2015 American Chemical Society.

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U2 - 10.1021/acs.chemmater.5b03169

DO - 10.1021/acs.chemmater.5b03169

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SN - 0897-4756

VL - 27

SP - 7149

EP - 7155

JO - Chemistry of Materials

JF - Chemistry of Materials

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