Colloidal Quantum Dot Photovoltaics Using Ultrathin, Solution-Processed Bilayer In2O3/ZnO Electron Transport Layers with Improved Stability

Ahmad R. Kirmani*, Flurin Eisner, Ahmed E. Mansour, Yuliar Firdaus, Neha Chaturvedi, Akmaral Seitkhan, Mohamad I. Nugraha, Emre Yarali, F. Pelayo Garclá De Arquer, Edward H. Sargent, Thomas D. Anthopoulos, Aram Amassian

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Solution-processed colloidal quantum dot (CQD) photovoltaics (PVs) continue to mature with improvements in device architectures and ligand exchange strategies. Carrier selective contacts extract photogenerated charge carriers from the CQD absorber; however, the role of the electron-transporting layer (ETL) in stability remains unclear. Herein, we find that the typically used >100 nm thick ZnO ETL suffers from parasitic absorption and carrier recombination resulting in unstable n-i-p solar cells with faster UV-degradation. We address this by developing an ultrathin (ca. 20 nm), quantum-confined, solution-processed In2O3/ZnO ETL. This bilayer ETL results in solar cells with significantly improved overall stability without compromising performance, with an 11.1% power conversion efficiency hero device.

Original languageEnglish (US)
Pages (from-to)5135-5141
Number of pages7
JournalACS Applied Energy Materials
Volume3
Issue number6
DOIs
StatePublished - Jun 22 2020

Keywords

  • colloidal quantum dots
  • electron-transporting layer
  • indium oxide
  • solar cells
  • stability
  • zinc oxide

ASJC Scopus subject areas

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

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