Kobbekaduwa Kanishka, Liu Exian, Zhao Qian, Bains Jasjit Singh, Zhang Jianbing, Shi Ying, Zheng Haimei, Li Dawen, Cai Tong, Chen Ou, Rao Apparao M, Beard Matthew C, Luther Joseph M, Gao Jianbo
Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States.
Chemistry & Nanoscience Center, National Renewable Energy Laboratory, Golden, Colorado 80401, United States.
ACS Nano. 2023 Jul 25;17(14):13997-14004. doi: 10.1021/acsnano.3c03989. Epub 2023 Jul 14.
We study the early time carrier drift dynamics in CsPbI nanocrystal thin films with a sub 25 ps time resolution. Prior to trapping, carriers exhibit band-like transport characteristics, which is similar to those of traditional semiconductor solar absorbers including Si and GaAs due to optical phonon and carrier scattering at high temperatures. In contrast to the popular polaron scattering mechanism, the CsPbI nanocrystal thin film demonstrates the strongest optical phonon scattering mechanism among other inorganic-organic hybrid perovskites, Si, and GaAs. This ultrafast dynamics study establishes a foundation for understanding the fundamental carrier drift properties that drive perovskite nanocrystal optoelectronics.
我们以低于25皮秒的时间分辨率研究了CsPbI纳米晶体薄膜中的早期载流子漂移动力学。在俘获之前，载流子表现出类能带输运特性，由于高温下的光学声子和载流子散射，这与包括Si和GaAs在内的传统半导体太阳能吸收体相似。与流行的极化子散射机制不同，CsPbI纳米晶体薄膜在其他无机-有机杂化钙钛矿、Si和GaAs中表现出最强的光学声子散射机制。这项超快动力学研究为理解驱动钙钛矿纳米晶体光电子学的基本载流子漂移特性奠定了基础。
