A novel and functional single-layer sheet of ZnSe

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Abstract

The recently synthesized freestanding four-atom-thick double-layer sheet of ZnSe holds great promise as an ultraflexible and transparent photoelectrode material for solar water splitting. In this work, we report theoretical studies on a novel three-atom-thick single-layer sheet of ZnSe that demonstrates a strong quantum confinement effect by exhibiting a large enhancement of the band gap (2.0 eV) relative to the zinc blende (ZB) bulk phase. Theoretical optical absorbance shows that the largest absorption of this ultrathin single-layer sheet of ZnSe occurs at a wavelength similar to its four-atom-thick double-layer counterpart, suggesting a comparable behavior on incident photon-to-current conversion efficiency for solar water splitting, among a wealth of potential applications. The results presented herein for ZnSe may be generalized to other group II-VI analogues.

Original languageEnglish
Pages (from-to)1458-1464
Number of pages7
JournalACS Applied Materials and Interfaces
Volume7
Issue number3
DOIs
StatePublished - Jan 28 2015

Funding

FundersFunder number
U.S. Department of EnergyDE-AC02-05CH11231, DE-AC05-00OR22750

    Keywords

    • BSE
    • DFT
    • GW approximation
    • Two-dimensional materials
    • photovoltaic

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