光激发
纳米团簇
超快激光光谱学
材料科学
光电流
电子转移
纳米晶
钙钛矿(结构)
光电子学
电子
光谱学
纳米技术
化学
原子物理学
物理
激发态
光化学
结晶学
量子力学
作者
Kritiman Marjit,Goutam Ghosh,Srijon Ghosh,Debarati Ghosh,Anusri Medda,Amitava Patra
标识
DOI:10.1021/acsphyschemau.2c00070
摘要
Lead halide perovskite nanocrystals have received significant attention as an absorber material for designing efficient optoelectronic devices. The fundamental understanding of the hot carrier (HC) dynamics as well as its extraction in hybrid systems is essential to further boost the performance of solar cells. Herein, we have explored the electron transfer dynamics in the CsPbBr3-Au144 cluster hybrid using ultrafast transient absorption spectroscopy. Our analysis reveals faster HC cooling time (from 515 to 334 fs) and a significant drop in HC temperature from 1055 to 860 K in hybrid, suggesting the hot electron transfer from CsPbBr3 nanocrystals to the Au nanoclusters (NCs). Eventually, we observe a much faster hot electron transfer compared to the band-edge electron transfer, and 45% hot-electron transfer efficiency was achieved at 0.64 eV, above band-edge photoexcitation. Furthermore, the significant enhancement of the photocurrent to the dark current ratio in this hybrid system confirms the charge separation via the electron transfer from CsPbBr3 nanocrystals to Au144 NCs. These findings on HC dynamics could be beneficial for optoelectronic devices.
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