Positive Aging Effect of ZnO Nanoparticles Induced by Surface Stabilization

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Wenjuan Zhang
  • Xingtong Chen
  • Zhiwei Xu
  • Longjia Wu
  • Yixing Yang
  • Song Chen

Detail(s)

Original languageEnglish
Pages (from-to)5863-5870
Journal / PublicationThe Journal of Physical Chemistry Letters
Volume11
Issue number15
Online published3 Jul 2020
Publication statusPublished - 6 Aug 2020

Abstract

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.

Citation Format(s)

Positive Aging Effect of ZnO Nanoparticles Induced by Surface Stabilization. / Zhang, Wenjuan; Chen, Xingtong; Ma, Yuhui; Xu, Zhiwei; Wu, Longjia; Yang, Yixing; Tsang, Sai-Wing; Chen, Song.

In: The Journal of Physical Chemistry Letters, Vol. 11, No. 15, 06.08.2020, p. 5863-5870.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review