Electrical Bias as an Alternate Method for Reproducible Measurement of Copper Indium Gallium Diselenide (CIGS) Photovoltaic Modules

Research output: Contribution to conferencePaperpeer-review

14 Scopus Citations

Abstract

Light-to-dark metastable changes in thin-film photovoltaic (PV) modules can introduce uncertainty when measuring module performance on indoor flash testing equipment. This study describes a method to stabilize module performance through forward-bias current injection rather than light exposure. Measurements of five pairs of thin-film copper indium gallium diselenide (CIGS) PV modules indicate that forward-bias exposure maintained the PV modules at a stable condition (within 1%) while the unbiased modules degraded in performance by up to 12%. It was also found that modules exposed to forward bias exhibited stable performance within about 3% of their long-term outdoor exposed performance. This carrier-injection method provides a way to reduce uncertainty arising from fast transients in thin-film module performance between the time a module is removed from light exposure and when it is measured indoors, effectively simulating continuous light exposure by injecting minority carriers that behave much as photocarriers do. This investigation also provides insight into the initial light-induced transients of thin-film modules upon outdoor deployment.

Original languageAmerican English
DOIs
StatePublished - 2012
EventReliability of Photovoltaic Cells, Modules, Components, and Systems V - San Diego, CA, United States
Duration: 13 Aug 201216 Aug 2012

Conference

ConferenceReliability of Photovoltaic Cells, Modules, Components, and Systems V
Country/TerritoryUnited States
CitySan Diego, CA
Period13/08/1216/08/12

Bibliographical note

See CP-5200-56078 for preprint

NREL Publication Number

  • NREL/CP-5200-56978

Other Report Number

  • Paper No. 84720G

Keywords

  • CIGS
  • Forward bias
  • Metastability
  • Photovoltaic
  • Thin film
  • Transients

Fingerprint

Dive into the research topics of 'Electrical Bias as an Alternate Method for Reproducible Measurement of Copper Indium Gallium Diselenide (CIGS) Photovoltaic Modules'. Together they form a unique fingerprint.

Cite this