Abstract
AbstractHere, lattice expansion modulated reversible thermochromism (TCM) in all‐inorganic lead‐free Cs3Sb2I9 perovskite single crystals (SCs) is demonstrated. Upon temperature change, Cs3Sb2I9 SC exhibits a reversible color change between red and dark‐brown. The corresponding optical band‐edge modulation and structural phase transition are monitored by temperature dependent UV–vis absorption spectroscopy and X‐ray diffraction study. This observed reversible TCM is attributed to the lattice expansion and strain relaxation at elevated temperatures. Additionally, Raman spectroscopy confirms enhanced electron–phonon coupling originating from stretched SbI terminal bonds at elevated temperature. This work validates that the all‐inorganic Cs3Sb2I9 perovskites have the potential in smart thermochromic windows and temperature sensors applications.
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