Evaluation of hetero and back contact junctions of CZTSe: Ge bilayers solar cells with Modulus Spectroscopy

Sanghyun Lee, Kent J. Price, Edgardo Saucedo

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    1 Scopus citations

    Abstract

    We fabricated and analyzed CZTSe: Ge bi-layers solar cells to accurately evaluate the electrical structure at hetero and back contact junctions by modulus spectroscopy. Two separate built-in potentials of hetero and back contact junctions are extensively investigated to describe qualitative each junction model of CZTSe: Ge bilayers devices. Fabricated devices are analyzed with an equivalent circuit model, and LEVM/LEMW software resolved two different parallel circuit branch components. Modeling with LEVM/LEMW software accurately fits our model to modulus and impedance spectra in the given testing frequency domain. Using TCAD numerical simulations, we examine a variety of device models with a set of built-in potentials for appropriate parallel circuits with two capacitance and two resistance (R2=0.99). Our study shows that heterojunction built-in potential is 801 meV, which is 10 % smaller than a theoretical value, 894 meV. Conversely, the built-in potential of the back contact junction is 428 meV. Total built-in potential is 373 meV.

    Original languageEnglish
    Title of host publication2021 IEEE 48th Photovoltaic Specialists Conference, PVSC 2021
    Pages403-405
    Number of pages3
    ISBN (Electronic)9781665419222
    DOIs
    StatePublished - Jun 20 2021
    Event48th IEEE Photovoltaic Specialists Conference, PVSC 2021 - Fort Lauderdale, United States
    Duration: Jun 20 2021Jun 25 2021

    Publication series

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

    Conference

    Conference48th IEEE Photovoltaic Specialists Conference, PVSC 2021
    Country/TerritoryUnited States
    CityFort Lauderdale
    Period6/20/216/25/21

    Bibliographical note

    Funding Information:
    ACKNOWLEDGEMENT Authors acknowledges the generous support by the Duke Energy Foundation and CSRC at Indiana State University.

    Publisher Copyright:
    © 2021 IEEE.

    Keywords

    • built-in potential
    • CZTSe
    • Ge
    • Modulus spectroscopy

    ASJC Scopus subject areas

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

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