Journal
ADVANCED SCIENCE
Volume 8, Issue 19, Pages -Publisher
WILEY
DOI: 10.1002/advs.202100084
Keywords
blueshift-redshift crossover; inorganic lead-halide perovskites; material dimensionality; temperature-dependent bandgap
Categories
Funding
- Strategic Priority Research Program of the CAS [XDB20000000]
- National Natural Science Foundation of China [U1805252, 11704380, 12074380, 21975257, 11774345, 51672272, 21804134]
- CAS/SAFEA International Partnership Program for Creative Research Teams
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The temperature-dependent bandgap in CsPbBr3 perovskites varies with material dimensionality, showing an initial blueshift followed by a redshift trend in 2D nanoplatelets. This shift is attributed to the larger contribution from electron-optical phonon interaction in nanoplatelets compared to nanocrystals, as indicated by the Bose-Einstein two-oscillator modeling. These findings provide valuable insights into the origin of temperature-dependent bandgap shifts in perovskite semiconductor materials.
Understanding the origin of temperature-dependent bandgap in inorganic lead-halide perovskites is essential and important for their applications in photovoltaics and optoelectronics. Herein, it is found that the temperature dependence of bandgap in CsPbBr3 perovskites is variable with material dimensionality. In contrast to the monotonous redshift ordinarily observed in bulk-like CsPbBr3 nanocrystals (NCs), the bandgap of 2D CsPbBr3 nanoplatelets (NPLs) exhibits an initial blueshift then redshift trend with decreasing temperature (290-10 K). The Bose-Einstein two-oscillator modeling manifests that the blueshift-redshift crossover of bandgap in the NPLs is attributed to the significantly larger weight of contribution from electron-optical phonon interaction to the bandgap renormalization in the NPLs than in the NCs. These new findings may gain deep insights into the origin of bandgap shift with temperature for both fundamentals and applications of perovskite semiconductor materials.
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