Vitrification Transformation of Poly(Ethylene Oxide) Activating Interface Passivation for High-Efficiency Perovskite Solar Cells

Pingli Qin, Tong Wu, Zhengchun Wang, Xiaolu Zheng, Xueli Yu, Guojia Fang, Gang Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

16 Citations (Scopus)

Abstract

Interface engineering is critical for achieving high-efficiency and high-stability perovskite solar cells (PSCs). Herein, a new interface engineering approach—poly(ethylene oxide) (PEO) modification of SnO2 quantum dot (QD) film—to improve electron transport is introduced. It is found that when the PEO film is annealed over its glass-transition temperature, the ether-oxygen unshared electron pair in the PEO film activates to form a crosslinking complex with metal ions at the SnO2 QD and perovskite interface, which triggers heterogeneous nucleation over the perovskite precursor film and is beneficial for achieving uniform and dense perovskite films. PEO is also shown to passivate the bulk defects of perovskite films and the interface defects between SnO2 QD and perovskite, which promotes electron-transferring from the perovskite layer to cathode. PSCs based on SnO2 QD with PEO treatment exhibit an enhanced efficiency, leading to a champion PCE of 20.23%, with good reproducibility and stability.

Original languageEnglish
Article number1900134
JournalSolar RRL
Volume3
Issue number10
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • charge-extraction
  • interface passivation
  • perovskite solar cells
  • polyethylene oxide
  • vitrification transformation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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