Highly Efficient Large-Area Flexible Perovskite Solar Cells Containing Tin Oxide Vertical Nanopillars without Oxygen Vacancies

Peng Sun, Geping Qu, Qikun Hu, Yicong Ma, Hongshuai Liu, Zong Xiang Xu, Zhifeng Huang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Fabrication of high-quality electron transporting layers (ETLs) on large-area flexible electrodes is necessarily required, but challenging, to improve photovoltaic performance of flexible perovskite solar cells (PSCs) that are demanded for wearable electronic devices. This work shows one-step, oxygen-assisted glancing angle deposition to facilely deposit polycrystalline SnO2 nanopillars (NPs) that are free of oxygen deficiencies and vertically protrude on large-area transparent electrodes. Functioning as ETLs, SnO2 NPs comprehensively lead to an enhancement of light harvesting in perovskites, exciton separation, electron extraction and collection, and hole blocking, as well as the prevention of perovskite decomposition and the formation of perovskite defects. Large-area (1 cm2) flexible PSCs containing the SnO2 NPs show the champion power conversion efficiency (PCE) of 14.9%, which undergoes only 10% degradation for approximately 800 h storage and 20% degradation by manual bending for around 400 times. These photovoltaic performances are remarkably superior to large-area flexible PSCs having the conventionally used spin-coated SnO2 thin films that contain oxygen vacancies. These results pave the way toward scale-up fabrication of flexible PSCs that simultaneously satisfy the commercial requirements of high photovoltaic efficiency, shelf stability, and mechanical stability.

Original languageEnglish
Pages (from-to)3568-3577
Number of pages10
JournalACS Applied Energy Materials
Volume5
Issue number3
Early online date18 Mar 2022
DOIs
Publication statusPublished - 28 Mar 2022

Scopus Subject Areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Electrical and Electronic Engineering
  • Materials Chemistry

User-Defined Keywords

  • electron transporting layers
  • flexible perovskite solar cells
  • glancing angle deposition
  • oxygen deficiency
  • tin oxide nanopillars

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