材料科学
钙钛矿(结构)
激子
载流子寿命
声子
多激子产生
光伏
载流子
纳米材料
化学物理
量子点
放松(心理学)
光电子学
凝聚态物理
纳米技术
化学
硅
物理
光伏系统
心理学
生态学
社会心理学
生物
结晶学
作者
Ben P Carwithen,Thomas R. Hopper,Ziyuan Ge,Navendu Mondal,Tong Wang,Rozana Mazlumian,Xijia Zheng,Franziska Krieg,Federico Montanarella,Georgian Nedelcu,Martin Kroll,Miguel Albaladejo-Siguan,Jarvist M. Frost,Karl Leo,Yana Vaynzof,Maryna I. Bodnarchuk,Maksym V. Kovalenko,Artem A. Bakulin
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-03-20
标识
DOI:10.1021/acsnano.2c12373
摘要
The relaxation of the above-gap ("hot") carriers in lead halide perovskites (LHPs) is important for applications in photovoltaics and offers insights into carrier-carrier and carrier-phonon interactions. However, the role of quantum confinement in the hot carrier dynamics of nanosystems is still disputed. Here, we devise a single approach, ultrafast pump-push-probe spectroscopy, to study carrier cooling in six different size-controlled LHP nanomaterials. In cuboidal nanocrystals, we observe only a weak size effect on the cooling dynamics. In contrast, two-dimensional systems show suppression of the hot phonon bottleneck effect common in bulk perovskites. The proposed kinetic model describes the intrinsic and density-dependent cooling times accurately in all studied perovskite systems using only carrier-carrier, carrier-phonon, and excitonic coupling constants. This highlights the impact of exciton formation on carrier cooling and promotes dimensional confinement as a tool for engineering carrier-phonon and carrier-carrier interactions in LHP optoelectronic materials.
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