钙钛矿中热载流子的超快光谱探测  

Ultrafast Spectroscopy of Hot Carriers in Perovskites

作　　者：方红华 黎潇泽 周沄科 孙洪波[1] Fang Honghua;Li Xiaoze;Zhou Yunke;Sun Hongbo(State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学精密仪器系精密测试技术及仪器国家重点实验室,北京100084

出　　处：《光学学报》2021年第8期118-133,共16页Acta Optica Sinica

基　　金：国家自然科学基金(62075115,61960206003)。

摘　　要：热载流子能量耗散是太阳能电池效率损耗的主要来源之一。近年来,钙钛矿中的热载流子效应获得了研究人员的广泛关注。相比于传统半导体材料,钙钛矿具有较慢的热载流子冷却过程,有望利用这些热载流子,提高太阳能电池的能量转换效率,克服单结太阳能电池的Shockley-Queisser极限。本文主要阐述了近几年人们利用超快光谱技术在钙钛矿中观测到的热载流子弛豫现象,总结了其热载流子的动力学特性;对钙钛矿中各种体系中热载流子冷却的机理进行了梳理,并讨论了钙钛矿中热载流子的传输特性和抽取方法;最后对钙钛矿中的热载流子弛豫过程的调控和其热载流子太阳能电池中的应用发展进行了展望。Hot carrier energy loss is one of major loss channels of solar cell efficiency loss.In recent years,the hot carrier effect in perovskites has received extensive attention from researchers.Compared with traditional semiconductor materials,perovskite has a slower hot carrier cooling process.It is expected to use these hot carriers to improve the energy conversion efficiency of solar cells and overcome the Shockley-Queisser limit of single-junction solar cells.In this paper,recent photophysical findings on slowed hot carriers in varied perovskites are reviewed.The ultrafast cooling dynamics and related measurement techniques are summarized,with discussion of underlying slowed hot carrier cooling mechanisms.The transport and extraction of hot carrier in perovskite are highlighted.Engineering of hot-carrier cooling properties and prospects for perovskite hot-carrier solar cells are also presented.

关 键 词：超快光学 超快光谱 热载流子 太阳能电池 钙钛矿 

分 类 号：O433.1[机械工程—光学工程]