Pressure-Induced Phase Transformation and Bandgap Engineering of Formamidinium Lead Iodide Perovskite Nanocrystals

Formamidinium lead halides (FAPbX3, X=Cl, Br, I) perovskite materials have recently drawn an increased amount of attention owing to their superior optoelectronic properties and enhanced material stability as compared to their methylammonium-based (MA-based) analogues. Herein, we report a study of pr...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2018-07
Main Authors: Zhu, Hua, Cai, Tong, Que, Meidan, Song, Jeong-Pil, Rubenstein, Brenda M, Wang, Zhongwu, Chen, Ou
Format: Article
Language:English
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Summary:Formamidinium lead halides (FAPbX3, X=Cl, Br, I) perovskite materials have recently drawn an increased amount of attention owing to their superior optoelectronic properties and enhanced material stability as compared to their methylammonium-based (MA-based) analogues. Herein, we report a study of pressure-induced structural and optical evolution of FAPbI3 hybrid organic-inorganic perovskite nanocrystals (NCs) using a synchrotron-based X-ray scattering technique coupled with in situ absorption and photoluminescence (PL) spectroscopies. As a result of their unique structural stability and soft nature, FAPbI3 NCs exhibit a wide range of bandgap tunability (1.44 eV - 2.17 eV) as a function of pressure (0 - 13.4 GPa). The study presented here not only provides an efficient and chemically orthogonal means to controllably engineer the bandgap of FAPbI3 NCs using pressure, but more importantly sheds light on how to strategically design the bandgaps of FA-based hybrid organic-inorganic perovskites for various optoelectronic applications.
ISSN:1948-7185