Positive Aging Effect of ZnO Nanoparticles Induced by Surface Stabilization

For quantum-dot photodiodes comprising an electron-transporting layer assembled of ZnO nanoparticles, the light emitter/absorber generally exhibits enhanced optoelectronic performance after the device is shelf-aged. To understand the so-called positive aging effect, the optoelectronic properties of...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2020-08, Vol.11 (15), p.5863-5870
Main Authors: Zhang, Wenjuan, Chen, Xingtong, Ma, Yuhui, Xu, Zhiwei, Wu, Longjia, Yang, Yixing, Tsang, Sai-Wing, Chen, Song
Format: Article
Language:English
Subjects:
Physical Insights into Materials and Molecular Properties
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Summary:For quantum-dot photodiodes comprising an electron-transporting layer assembled of ZnO nanoparticles, the light emitter/absorber generally exhibits enhanced optoelectronic performance after the device is shelf-aged. To understand the so-called positive aging effect, the optoelectronic properties of ZnO nanoparticles are investigated at the thin film and device level as a function of aging time. It is evidenced that the aging process is driven by a surface-stabilizing mechanism of ZnO nanoparticles, in which the active surface adsorption sites for oxygen are gradually but irreversibly stabilized, i.e.. with surface termination of HO-ZnO, leading to reduced nonradiative recombination and increased built-in potential in the adjacent photoactive layer. This work provides insight into new synthetic routes for minimizing the negative impact caused by the aging process.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.0c01640