期刊
ADVANCED OPTICAL MATERIALS
卷 9, 期 22, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202101062
关键词
lattice expansion; lead-free perovskites; single crystals; smart windows; thermochromism
资金
- IIT, Roorkee
- Indian Space Research Organization
This study demonstrates reversible thermochromism in all-inorganic Cs3Sb2I9 perovskite single crystals, showing a color change between red and dark-brown with temperature variations. The reversible thermochromism is attributed to lattice expansion and strain relaxation at elevated temperatures, making these perovskites promising for smart thermochromic windows and temperature sensor applications.
Here, 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 Sb-I 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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