Improving stability by the introduction of oxidation in PbS colloidal quantum dot photodetectors

Ya Wang; Shaoqiu Xu; Mohan Yuan; Zhaorong Shi; Xingchen Zhang; Hang Xia; Xinzheng Lan

doi:10.1117/12.2691852

6 November 2023 Improving stability by the introduction of oxidation in PbS colloidal quantum dot photodetectors

Ya Wang, Shaoqiu Xu, Mohan Yuan, Zhaorong Shi, Xingchen Zhang, Hang Xia, Xinzheng Lan

Proceedings Volume 12921, Third International Computing Imaging Conference (CITA 2023); 129214L (2023) https://doi.org/10.1117/12.2691852
Event: Third International Computing Imaging Conference (CITA 2023), 2023, Sydney, Australia

Abstract

The PbS Colloidal Quantum Dots (CQDs) have garnered significant attention in the realm of infrared Photodetectors (PDs) owing to their advantageous features, such as monolithic integration with silicon-based readout circuits, high-performance and cost-effective infrared imaging. Nevertheless, the inherent characteristics of PbS CQD materials, namely their high surface area and energy, render them exceedingly susceptible to temperature and environmental influences, triggering CQD fusion and giving rise to trap states that ultimately impair the performance of PbS CQD PDs. This is one of the vital obstacles limiting the CQD imaging commercialization, thereby the PbS CQD stability needs to be tackled. In this study, we direct our focus towards the hole transport layer, i.e., 1, 2-ethanedithiol (EDT)-capped PbS CQDs, and propose an oxidation strategy aimed at impeding the PbS CQD fusion phenomenon and the generation of defects. Through the implementation of this strategy, the enhanced stability of CQDs ensured a greatly improved stability of PbS PDs, even under harsh environmental conditions characterized by 85 °C, 85% Relative Humidity (RH) in an N₂ environment.

Citation Download Citation

Ya Wang, Shaoqiu Xu, Mohan Yuan, Zhaorong Shi, Xingchen Zhang, Hang Xia, and Xinzheng Lan "Improving stability by the introduction of oxidation in PbS colloidal quantum dot photodetectors", Proc. SPIE 12921, Third International Computing Imaging Conference (CITA 2023), 129214L (6 November 2023); https://doi.org/10.1117/12.2691852

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