Reversible thermochromism, temperature-dependent conductivity and high stability for a laminated bismuth(iii)–silver(i) hybrid double perovskite. Issue 35 (31st August 2022)

• Record Type: Journal Article
• Authors: Lassoued, Mohamed Saber; Wang, Tengbo; Faizan, Ahmad; Li, Qian-Wen; Chen, Wei-Peng; Zheng, Yan-Zhen
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 35(2022)
• Page Start: 12574
• Page End: 12581
• Publication Date: 2022-08-31
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc03031d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : We report here a new two-dimensional bimetallic double perovskite with reversible thermochromism, enhanced electrical conductivity and outstanding stability. Abstract : Lead-free hybrid perovskite materials have attracted tremendous consideration due to their applications in photovoltaics, optoelectronics, thermal sensors, etc. Herein, we isolated a new stable semiconductive 2D bismuth(iii )–silver(i ) iodide hybrid double perovskite formulated as (H2 MPP)2 [BiAgI8 ], where H2 MPP = 1-methylpiperidinium-4-amine, with reversible solid-state thermochromism, a narrow bandgap and considerable temperature-dependent conductivity. Upon heating from 150 K to 450 K, (H2 MPP)2 [BiAgI8 ] crystals exhibit a reversible colour change between orange and dark red. The associated structural changes were monitored using in situ single-crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), UV-visible absorption and Raman spectroscopy. Besides, the electrical conductivity of (H2 MPP)2 [BiAgI8 ] changes over four orders of magnitude upon thermochromism (up to 1.51 × 10 −6 S cm −1 at 450 K) and showed an efficiently enhanced photocurrent switching on/off ratio. Moreover, the (H2 MPP)2 [BiAgI8 ] crystals can be processed into thin films via spin coating and exhibit high stability under heat and moisture, which is indicative of their potential optoelectronic applications based on thermochromism.