AgInS2-ZnS quantum dots: Excited state interactions with TiO2 and Photovoltaic Performance

Steven M. Kobosko, Danilo H. Jara, Prashant V. Kamat

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)

Abstract

Multinary quantum dots such as AgInS2 and alloyed AgInS2-ZnS are an emerging class of semiconductor materials for applications in photovoltaic and display devices. The nanocrystals of (AgInS2)x-(ZnS)1-x (for x = 0.67) exhibit a broad emission with a maximum at 623 nm and interact strongly with TiO2 nanostructures by injecting electrons from the excited state. The electron transfer rate constant as determined from transient absorption spectroscopy was 1.8 × 1010 s-1. The photovoltaic performance was evaluated over a period of a few weeks to demonstrate the stability of AgInS2-ZnS when utilized as sensitizers in solar cells. We report a power conversion efficiency of 2.25% of our champion cell 1 month after its fabrication. The limitations of AgInS2-ZnS nanocrystals in achieving greater solar cell efficiency are discussed.

Original languageEnglish
Pages (from-to)33379-33388
Number of pages10
JournalACS Applied Materials and Interfaces
Volume9
Issue number39
DOIs
Publication statusPublished - 2017
Externally publishedYes

Keywords

  • AginS
  • Electron transfer
  • Emission quenching
  • Quantum dots
  • Solar cells

ASJC Scopus subject areas

  • Materials Science(all)

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