Ultrafast Carrier Drift Transport Dynamics in CsPbI 3 Perovskite Nanocrystalline Thin Films.
Kanishka KobbekaduwaExian LiuQian ZhaoJasjit Singh BainsJianbing ZhangYing ShiHaimei ZhengDawen LiTong CaiOu ChenApparao M RaoMatthew C BeardJoseph M LutherJianbo GaoPublished in: ACS nano (2023)
We study the early time carrier drift dynamics in CsPbI 3 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 3 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.