Electrochemical modulation of trap states in PbS QDs and their electrical characterization

Junyoung Jin, Tae Hwan Park, Tae Yeon Seong, Gyu Weon Hwang

Research output: Contribution to journalArticlepeer-review

Abstract

The optoelectronic devices based on colloidal lead sulfide quantum dots (PbS QDs) have suffered from electronic trap states in bandgap. The trap state is a source for accelerating carrier recombination and degrading the performance of optoelectronic devices. Here, we treated PbS QD electrochemically using cyclic voltammetry to modulate the density of trap states. The reduction of the trap density in the QD layer after electrochemical treatment was confirmed by the impedance analyzing technique, the thermal admittance spectroscopy. The XPS spectra showed that the QD films are oxidized after the electrochemical treatment, implying that the oxidation of the QD surface regulated the trap density through the electrochemical treatment.

Original languageEnglish
Pages (from-to)54-58
Number of pages5
JournalJournal of the Korean Physical Society
Volume81
Issue number1
DOIs
Publication statusPublished - 2022 Jul

Bibliographical note

Funding Information:
The authors acknowledge the financial support from the Korea Institute of Science and Technology (KIST) Institution Program (Grant no. 2E31510).

Publisher Copyright:
© 2022, The Korean Physical Society.

Keywords

  • Cyclic voltammetry
  • Lead sulfide
  • Quantum dot
  • Thermal admittance spectroscopy
  • Trap passivation
  • XPS

ASJC Scopus subject areas

  • General Physics and Astronomy

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