A Strategy for Tuning Electron–Phonon Coupling and Carrier Cooling in Lead Halide Perovskite Nanocrystals

Shi，Huafeng1,2; Zhang，Xiaoli3; Li，Ruxue1; Zhang，Xinhai1

2023-12-01

10.3390/nano13243134

Nanomaterials   影响因子和分区

2079-4991

Perovskites have been recognized as a class of promising materials for optoelectronic devices. We intentionally include excessive Cs cations in precursors in the synthesis of perovskite CsPbBr nanocrystals and investigate how the Cs cations influence the lattice strain in these perovskite nanocrystals. Upon light illumination, the lattice strain due to the addition of alkali metal Cs cations can be compensated by light–induced lattice expansion. When the Cs cation in precursors is about 10% excessive, the electron–phonon coupling strength can be reduced by about 70%, and the carrier cooling can be slowed down about 3.5 times in lead halide perovskite CsPbBr nanocrystals. This work reveals a new understanding of the role of Cs cations, which take the A–site in ABX perovskite and provide a new way to improve the performance of perovskites and their practical devices further.

carrier cooling electron–phonon coupling light–induced lattice expansion perovskites

SCI

英语

第一 ; 通讯

2-s2.0-85180515600

Scopus

1.Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Center of Attosecond Science,Songshan Lake Materials Laboratory (SLAB),Dongguan,523808,China
3.Guangdong Provincial Key Laboratory of Information Photonics Technology,School of Physics,Opto–Electronic Engineering,Guangdong University of Technology,Guangzhou,510006,China

Shi，Huafeng,Zhang，Xiaoli,Li，Ruxue,等. A Strategy for Tuning Electron–Phonon Coupling and Carrier Cooling in Lead Halide Perovskite Nanocrystals[J]. Nanomaterials,2023,13(24).

Shi，Huafeng,Zhang，Xiaoli,Li，Ruxue,&Zhang，Xinhai.(2023).A Strategy for Tuning Electron–Phonon Coupling and Carrier Cooling in Lead Halide Perovskite Nanocrystals.Nanomaterials,13(24).

Shi，Huafeng,et al."A Strategy for Tuning Electron–Phonon Coupling and Carrier Cooling in Lead Halide Perovskite Nanocrystals".Nanomaterials 13.24(2023).