Work

Mechanistic Identification of Oxygen Species in the Degradation of CsPbBr3 Quantum Dot Films Through Real-Time In Situ Monitoring

Year: 2025

Type: article

Abstract: The chemical identity of oxygen species plays a decisive role in determining the optical stability of halide perovskite QD films. Here, real-time in situ spectroscopic monitoring, together with steady-state and time-resolved photoluminescence measurements, is utilized to differentiate the effects of molecular oxygen and plasma-activated oxygen species on CsPbBr3 QD films. The films maintain nearly unchanged emission intensity, spectral profile, and carrier lifetimes when stored in vacuum or exposed to molecular O2 even under UV illumination, demonstrating that neutral O2 exhibits minimal reactivity toward the [PbBr6]4− framework. In contrast, oxygen plasma generates highly reactive atomic and ionic oxygen species that induce rapid and spatially heterogeneous photoluminescence quenching. This degradation is attributed to Br− extraction, Br-vacancy formation, and subsequent Pb–O bond generation, which collectively introduce deep trap states and enhance nonradiative recombination. These findings clearly indicate that reactive oxygen species rather than molecular O2 are the dominant driver of oxygen-induced luminescence degradation, providing mechanistic insight and offering processing guidelines for the reliable integration of perovskite nanomaterials in optoelectronic devices.

Source: Materials

DOI: 10.3390/ma18235467

Authors: Zewen Lin, Jie Song, Haixia Wu, Hongliang Li, Rui Huang

Institution: Hanshan Normal University

Language: English

Topic: Perovskite Materials and Applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funders: National Natural Science Foundation of China, Department of Education of Guangdong Province, Hanshan Normal University, Basic and Applied Basic Research Foundation of Guangdong Province