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

Hua Zhu; Tong Cai; Meidan Que; Jeong-Pil Song; Brenda M Rubenstein; Zhongwu Wang; Ou Chen

doi:10.1021/acs.jpclett.8b01852

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

J Phys Chem Lett. 2018 Aug 2;9(15):4199-4205. doi: 10.1021/acs.jpclett.8b01852. Epub 2018 Jul 13.

Authors

Hua Zhu¹, Tong Cai¹, Meidan Que¹, Jeong-Pil Song¹, Brenda M Rubenstein¹, Zhongwu Wang², Ou Chen¹

Affiliations

¹ Department of Chemistry , Brown University , Providence , Rhode Island 02912 , United States.
² Cornell High Energy Synchrotron Source , Cornell University , Ithaca , New York 14853 , United States.

PMID: 29991259
DOI: 10.1021/acs.jpclett.8b01852

Abstract

Formamidinium lead halide (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 with their methylammonium-based (MA-based) analogues. Herein, we report a study of the pressure-induced structural and optical evolutions of FAPbI₃ hybrid organic-inorganic perovskite nanocrystals (NCs) using a synchrotron-based X-ray scattering technique coupled to in situ absorption and photoluminescence spectroscopies. As a result of their unique structural stability and soft nature, FAPbI₃ NCs exhibit a wide range of band-gap tunability (1.44-2.17 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 band gap of FAPbI₃ NCs using pressure but more importantly sheds light on how to strategically design the band gaps of FA-based hybrid organic-inorganic perovskites for various optoelectronic applications.