Impact of ultrafast carrier cooling on the open-circuit voltage in a Ag/Bi co-doped CsPbBr₃ NC based photodetector.

IF 3.1 2区物理与天体物理 Q2 OPTICS

Optics letters Pub Date : 2025-06-15 DOI:10.1364/OL.564552

Chinmay Barman, Rahul Murali, Venugopal Rao Soma, Sai Santosh Kumar Raavi

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引用次数: 0

Abstract

Precise control of the hot carrier (HC) relaxation dynamics in halide perovskites is crucial for optimizing the performance of optoelectronic applications requiring efficient energy harvesting and charge transport. Herein, we investigate the effects of Bi, Ag, and Ag/Bi co-doping on HC relaxation in CsPbBr₃ nanocrystals (NCs) using femtosecond transient absorption spectroscopy (TAS) and assess their impact on self-powered photodetectors (PDs). Temperature-dependent photoluminescence (PL) and HC energy loss rate analysis reveal an almost twofold reduction in the coupling strength and a threefold enhancement in the longitudinal optical (LO) phonon lifetimes after doping/co-doping. The extended LO phonon lifetime and suppressed coupling strength after Ag and Ag/Bi co-doping enhance the hot phonon bottleneck effect and prolong the HC relaxation process. These findings and improved self-powered PD performance provide a practical strategy for tailoring the HC dynamics in perovskite NCs, paving the way for designing high-efficiency photodetectors and solar cells.

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超快载流子冷却对银/铋共掺CsPbBr3 NC光电探测器开路电压的影响。

卤化物钙钛矿中热载流子（HC）弛豫动力学的精确控制对于优化需要高效能量收集和电荷传输的光电应用的性能至关重要。本文利用飞秒瞬态吸收光谱（TAS）研究了Bi、Ag和Ag/Bi共掺杂对CsPbBr3纳米晶体（NCs）中HC弛豫的影响，并评估了它们对自供电光电探测器（pd）的影响。温度依赖性光致发光（PL）和HC能量损失率分析表明，掺杂/共掺杂后，耦合强度降低了近两倍，纵向光学（LO）声子寿命提高了三倍。Ag和Ag/Bi共掺杂延长了LO声子寿命，抑制了耦合强度，增强了热声子瓶颈效应，延长了HC弛豫过程。这些发现和改进的自供电PD性能为定制钙钛矿NCs中的HC动力学提供了实用策略，为设计高效光电探测器和太阳能电池铺平了道路。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics letters 物理-光学

CiteScore

6.60

自引率

8.30%

发文量

2275

审稿时长

1.7 months

期刊介绍： The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community. Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.