Large Metastability in Cu(In,Ga)Se2 Devices: The Importance of Buffer Properties

Ingrid Repins, Stephen Glynn, Timothy Silverman, Hobart Stevens, Lorelle Mansfield, Rebekah Garris, Karen Bowers

Research output: Contribution to journalArticlepeer-review

14 Scopus Citations


Some commercial Cu (In,Ga)Se2 (CIGS) modules show large changes in current-voltage parameters with light soaking. While such changes are not necessarily indicative of a performance problem, the associated uncertainty may be disadvantageous in a highly competitive market. Thus, it is beneficial to understand the origin of large metastabilities in order to define what processing changes might diminish metastability without impacting other desirable aspects of high-performance devices. This study attempts to reproduce large metastabilities like those in some commercial products both through absorber and buffer processing variations in small devices. While variations of both types were found to affect metastability, only buffer variations could reproduce large metastability in high-efficiency devices. Device modeling confirms that buffer effects alone are sufficient to explain the large metastability seen in these devices.

Original languageAmerican English
Pages (from-to)749-759
Number of pages11
JournalProgress in Photovoltaics: Research and Applications
Issue number9
StatePublished - 2019

Bibliographical note

Publisher Copyright:
Published 2019. This article is a U.S. Government work and is in the public domain in the USA.

NREL Publication Number

  • NREL/JA-5K00-72573


  • buffer
  • CdS
  • CIGS
  • Cu (In,Ga)Se
  • light soak
  • metastable
  • Zn(O,S)


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