Solution-processed zinc phosphide (α-Zn3P2) colloidal semiconducting nanocrystals for thin film photovoltaic applications

Download
  1. Get@NRC: Solution-processed zinc phosphide (α-Zn3P2) colloidal semiconducting nanocrystals for thin film photovoltaic applications (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1021/nn4034234
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleACS Nano
ISSN1936-0851
Volume7
Issue9
Pages81368146; # of pages: 11
SubjectCore-shell; earth-abundant; Photovoltaics; Semiconductor nanocrystals; Solution-processed; Zinc phosphide; Heterojunctions; Molybdenum oxide; Nanocrystals; Nanoparticles; Photoelectron spectroscopy; Photoelectrons; Quantum confinement; Synthesis (chemical); Thin films; Transmission electron microscopy; X ray diffraction; X ray photoelectron spectroscopy; Zinc
AbstractZinc phosphide (Zn3P2) is a promising earth-abundant material for thin film photovoltaic applications, due to strong optical absorption and near ideal band gap. In this work, crystalline zinc phosphide nanoparticles are synthesized using dimethylzinc and tri-n-octylphosphine as precursors. Transmission electron microscopy and X-ray diffraction data show that these nanoparticles have an average diameter of ∼8 nm and adopt the crystalline structure of tetragonal α-Zn3P2. The optical band gap is found to increase by 0.5 eV relative to bulk Zn 3P2, while there is an asymmetric shift in the conduction and valence band levels. Utilizing layer-by-layer deposition of Zn 3P2 nanoparticle films, heterojunction devices consisting of ITO/ZnO/Zn3P2/MoO3/Ag are fabricated and tested for photovoltaic performance. The devices are found to exhibit excellent rectification behavior (rectification ratio of 600) and strong photosensitivity (on/off ratio of ∼10²). X-ray photoelectron spectroscopy and ultraviolet photoemission spectroscopy analyses reveal the presence of a thin 1.5 nm phosphorus shell passivating the surface of the Zn3P 2 nanoparticles. This shell is believed to form during the nanoparticle synthesis.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21270521
Export citationExport as RIS
Report a correctionReport a correction
Record identifierae7f8f26-1d83-4169-9e87-cebfd4b01348
Record created2014-02-14
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)