Engineering of effective back-contact barrier of CZTSe: Nanoscale Ge solar cells – MoSe2 defects implication

Sanghyun Lee, Kent J. Price, Edgardo Saucedo, Sergio Giraldo

    Research output: Contribution to journalArticlepeer-review

    9 Scopus citations

    Abstract

    Using temperature-dependent measurements and device modeling, we systematically study the effective back-contact barrier of CZTSe devices to improve the property of the back-contact interface. By comparing with CZTSe devices with various nanoscale Ge configurations, CZTSe nanoscale Ge bi-layers devices show the improved power conversion efficiency by 1.1%. DC magnetron sputtering is used to fabricate CZTSe: nanolayer Ge devices. Critical device parameters are characterized to understand the impact of nanoscale Ge films on the back-contact device characteristics. Based on empirical results, modeling is performed for the influence of MoSe2 defects on the effective back-contact barrier. Analysis of experimental results of Ge bi-layers devices with the improved back-contact barrier makes a good agreement with modeling and Sentaurus TCAD simulation at the 95% confidence-level. The conversion efficiency of CZTSe: nanoscale Ge bi-layers devices is improved up to 8.3%.

    Original languageEnglish
    Pages (from-to)114-120
    Number of pages7
    JournalSolar Energy
    Volume194
    DOIs
    StatePublished - Dec 2019

    Bibliographical note

    Funding Information:
    This work was partially supported by the Louisville Gas & Energy and Kentucky Utility Foundation , Duke Energy Foundation , and CSRC at Indiana State University.

    Funding Information:
    This work was partially supported by the Louisville Gas & Energy and Kentucky Utility Foundation, Duke Energy Foundation, and CSRC at Indiana State University.

    Publisher Copyright:
    © 2019 International Solar Energy Society

    Keywords

    • Back-contact
    • CZTSe
    • Ge nanolayer
    • Kesterite
    • Scottky barrier
    • Thin film solar cells

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Materials Science (all)

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