Influence of Molybdenum Back Contact on the PID Effect for Cu(In,Ga)Se2 Solar Cell

Salomon, O. and Hempel, W. and Kiowski, O. and Lotter, E. and Witte, W. and Ferati, A. and Schneikart, A. and Kaune, G. and Schäffler, R. and Becker, M. and Schröppel, B. and Vidal Lorbada, Ricardo and Mücke, D. and Walter, T. (2019). Influence of Molybdenum Back Contact on the PID Effect for Cu(In,Ga)Se2 Solar Cell. "Coatings", v. 9 (n. 794); pp. 1-12. ISSN 2079-6412. https://doi.org/10.3390/coatings9120794.

Description

Title: Influence of Molybdenum Back Contact on the PID Effect for Cu(In,Ga)Se2 Solar Cell
Author/s:
  • Salomon, O.
  • Hempel, W.
  • Kiowski, O.
  • Lotter, E.
  • Witte, W.
  • Ferati, A.
  • Schneikart, A.
  • Kaune, G.
  • Schäffler, R.
  • Becker, M.
  • Schröppel, B.
  • Vidal Lorbada, Ricardo
  • Mücke, D.
  • Walter, T.
Item Type: Article
Título de Revista/Publicación: Coatings
Date: 26 November 2019
ISSN: 2079-6412
Volume: 9
Subjects:
Freetext Keywords: CIGS; PID; sodium; GDOES; EBIC; CV; stability PV; photovoltaic
Faculty: Instituto de Energía Solar (IES) (UPM)
Department: Electrónica Física, Ingeniería Eléctrica y Física Aplicada
UPM's Research Group: Silicio y Nuevos Conceptos para Células Solares
Creative Commons Licenses: Recognition

Full text

[img]
Preview
PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (2MB) | Preview

Abstract

The authors investigated the effect of an applied high voltage (1 kV) across the thickness of a soda-lime glass substrate of Cu(In,Ga)Se2 (CIGS) thin-film solar cells. Two types of CIGS cells were tested, differing only in the deposition process of the molybdenum (Mo) back contact. Whilst one cell type was susceptible to potential induced degradation (PID), the other exhibited highly increased stability against PID. PID occurs for PID-susceptible cells after the transfer of a certain amount of charge through the soda-lime glass substrate when the Mo back contact of the cell operates as a cathode (negatively biased versus backside of the substrate). Capacitance–voltage and electron-beam-induced current measurements showed an enlarged space charge region expanding to the Mo back contact and a lowered doping density by a negative potential for PID-susceptible cells. Glow discharge optical emission spectroscopy (GDOES) revealed an accumulation of sodium (Na) in the solution-grown CdS buffer layer and a segregation on the surface of the ZnO:Al window layer for higher charges for PID-susceptible cells. Cells with increased PID immunity did not show an increase of Na for charges up to around 9 mC/cm². We demonstrate that it is possible to improve the PID stability of CIGS solar cells by modification of the molybdenum back contact.

More information

Item ID: 57428
DC Identifier: http://oa.upm.es/57428/
OAI Identifier: oai:oa.upm.es:57428
DOI: 10.3390/coatings9120794
Official URL: https://www.mdpi.com/2079-6412/9/12/794
Deposited by: D. Ricardo Vidal Lorbada
Deposited on: 03 Dec 2019 10:36
Last Modified: 03 Dec 2019 10:36
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM