Work

Ultrafast Photoexcitation Induced Nonthermal Lattice Expansion in 2D Perovskite

Year: 2025

Type: article

Abstract: Light-induced lattice change of perovskites is found to be critical for device performance. However, the underlying mechanism is still not fully understood. Here, real-time time-dependent density functional theory (rt-TDDFT) calculations along with experiments are utilized to discern the photo-induced electronic and structural changes in 2D Dion-Jacobson (DJ) perovskites, showing that photoexcitation drives the non-thermal lattice expansion, leading to the increase in bandgap. The ultrafast photoexcitation effect is found to improve the film crystallinity and charge transport, which brings a longer carrier lifetime and slower carrier recombination rate, leading to remarkable improvement of photovoltaic performance. These results not only provide insights into the photo-physics of perovskites, but also show the potential of a new passivation technique for perovskite optoelectronics via ultrafast photoexcitation.

Source: Advanced Science

DOI: 10.1002/advs.202510954

Authors: Xiangyu Chen, Jiakang Zhou, Yunfan Yue, Zhongle Zeng, Xuewen Wang

Institutions: Wuhan University of Technology, State Key Laboratory of Advanced Technology For Materials Synthesis and Processing

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $6,730

Funders: National Key Research and Development Program of China, Basic and Applied Basic Research Foundation of Guangdong Province