Optical Characterization of Ternary Element Loss during Co-Chloride Passivation of Polycrystalline II-VI Wide-Bandgap Alloys

Carey Reich, Arthur Onno, Walajabad S. Sampath, Zachary C. Holman

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Alloys of the II-VI semiconductor CdTe with Mg or Zn have tunable bandgaps in the range modelled to be optimal for integration as a top cell in a tandem photovoltaic device with a Si bottom cell. Leveraging the low-cost production techniques developed for CdTe, this pairing has the potential to produce low-cost and highly efficient tandem PV cells. However, the CdCl2 post-deposition bulk passivation process widely used for CdTe reduces the concentration of the ternary elements in the absorber, reducing the bandgap from the modelled values, and results in poorer activation than the same process applied to pure CdTe material. We study the mitigation of this loss during CdCl2 treatment by the development of an overpressure of MgCl2 and ZnCl2, thought to be products of the loss reaction, for Cd1-xMgxTe and Cd1-xZnxTe, respectively. Little effect is seen until a vapor pressure far in excess of CdCl2 is achieved, reducing the loss - as measured by transmittance - by half.

Original languageEnglish (US)
Title of host publication2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages2494-2497
Number of pages4
ISBN (Electronic)9781728104942
DOIs
StatePublished - Jun 2019
Event46th IEEE Photovoltaic Specialists Conference, PVSC 2019 - Chicago, United States
Duration: Jun 16 2019Jun 21 2019

Publication series

NameConference Record of the IEEE Photovoltaic Specialists Conference
ISSN (Print)0160-8371

Conference

Conference46th IEEE Photovoltaic Specialists Conference, PVSC 2019
CountryUnited States
CityChicago
Period6/16/196/21/19

Keywords

  • II-VI semiconductors
  • Tandem Photovoltaics

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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    Reich, C., Onno, A., Sampath, W. S., & Holman, Z. C. (2019). Optical Characterization of Ternary Element Loss during Co-Chloride Passivation of Polycrystalline II-VI Wide-Bandgap Alloys. In 2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019 (pp. 2494-2497). [8980642] (Conference Record of the IEEE Photovoltaic Specialists Conference). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PVSC40753.2019.8980642