Robust and Swiftly Reversible Thermochromic Behavior of a 2D Perovskite of (C6H4(CH2NH3)2)(CH3NH3)[Pb2I7] for Smart Window and Photovoltaic Smart Window Applications

Yang Zhang; Zeyang Wang; Shu Hu; Pingyuan Yan; Heng Li; ChuanXiang Sheng

doi:10.1021/acsami.1c00163

Robust and Swiftly Reversible Thermochromic Behavior of a 2D Perovskite of (C₆H₄(CH₂NH₃)₂)(CH₃NH₃)[Pb₂I₇] for Smart Window and Photovoltaic Smart Window Applications

ACS Appl Mater Interfaces. 2021 Mar 17;13(10):12042-12048. doi: 10.1021/acsami.1c00163. Epub 2021 Mar 5.

Authors

Yang Zhang¹, Zeyang Wang¹, Shu Hu¹, Pingyuan Yan¹, Heng Li¹, ChuanXiang Sheng¹

Affiliation

¹ School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

PMID: 33666435
DOI: 10.1021/acsami.1c00163

Abstract

Highly robust, swiftly reversible thermochromic nature of a two-dimensional (2D) perovskite of (PDMA)(CH₃NH₃)_n-1Pb_nI_3n+1, nominally prepared as n = 2 is found, where PDMA = C₆H₄(CH₂NH₃)₂. A wide band gap variation from 700 to 430 nm is observed between room temperature and >60 °C under ambient conditions, resulting from moisture absorption and desorption. X-ray diffraction and Fourier-transform infrared spectroscopy are performed to analyze the hydrated and dehydrated states. Furthermore, the (PDMA)(CH₃NH₃)_n-1Pb_nI_3n+1 film is demonstrated as an active material for smart windows and thermochromic solar cells, which could lower the inside air temperature in an enclosed space and supply a power conversion efficiency of more than 0.5% at a high ambient temperature, respectively. Overall, we may pave a pathway for exploring the novel phenomena and applications of Dion-Jacobson 2D perovskites.

Keywords: 2D perovskite; Dion−Jacobson; smart window; solar cell; thermochromic.