Cited time in webofscience Cited time in scopus

Two local built-in potentials of H2S processed CZTSSe by complex impedance spectroscopy

Title
Two local built-in potentials of H2S processed CZTSSe by complex impedance spectroscopy
Author(s)
Lee, SanghyunPrice, Kent J.Kim, Dae-Hwan
Issued Date
2021-09
Citation
Solar Energy, v.225, pp.11 - 18
Type
Article
Author Keywords
Back contact junctionBuilt-in potentialCZTSSeHetero-junctionInterfaceSpectroscopy
Keywords
SILICON SOLAR-CELLSDEVICE CHARACTERISTICSEQUIVALENT-CIRCUITQUANTUM EFFICIENCYDEGRADATIONTRANSPORTADMITTANCEINTERFACEGROWTHMODEL
ISSN
0038-092X
Abstract
We have fabricated CZTSSe solar cells with H2S sulfo-selenization processes and investigated the electronic structure at the PN hetero- and back contact junctions by impedance spectroscopy. By decoupling each junction's impedance spectroscopic responses, we systematically characterized the built-in potential of two local junction interfaces. A developed equivalent circuit model has been optimized for decoupling each junction's property at different frequency bands. Modeling and numerical simulations were conducted with the in-house MATLAB modeling suites connected to external simulators of Sentaurus TCAD and LEVM/LEVMW software to estimate the impact of each junction component to impedance spectra. The optimized model is comprised of a parallel circuit combination with resistance and capacitor-like elements (constant phase elements), connected to one inductive element. The conversion efficiency of CZTSSe devices is 6.2% with bandgap energy 1.13 eV based on external quantum efficiency measurements. From the equivalent circuit model, the built-in potential of the hetero-junction is characterized as 956 meV, which is ~3% smaller than an ideal case from TCAD, 987 meV. Conversely, the built-in potential of the back contact junction is 476 meV. The apparent built-in potential is estimated as 480 meV from the Mott-Schottky equation. © 2021
URI
http://hdl.handle.net/20.500.11750/15530
DOI
10.1016/j.solener.2021.06.064
Publisher
Pergamon Press Ltd.
Related Researcher
  • 김대환 Kim, Dae-Hwan
  • Research Interests Solar Cells; 태양전지; Thin Film Deposition; 박막 증착; Atomic Layer Deposition; 원자층 증착; CIGS; CZTS; Sb chalcogenides; 안티모니 칼코지나이드
Files in This Item:

There are no files associated with this item.

Appears in Collections:
Division of Energy & Environmental Technology 1. Journal Articles

qrcode

  • twitter
  • facebook
  • mendeley

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE