Correlation between grain composition and charge carrier collection in Cu(In,Ga)Se2 solar cells

Bradley West, Sebastian Husein, Michael Stuckelberger, Barry Lai, Jorg Maser, Benjamin Stripe, Volker Rose, Harvey Guthrey, Mowafak Al-Jassim, Mariana Bertoni

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Scopus citations


Understanding the spatial composition inhomogeneity in CIGS solar cells can provide insight into a potentially large cause of decreased cell efficiency. We used synchrotron based nano x-ray fluorescence and nano x-ray beam induduced current to investigate the correlation between grain-to-grain compositional variations in Cu(In,Ga)Se2 absorber layers and variations in carrier collection efficiency. We found compositional variations as large as 5 at. % and current variations as large as 10%. Grains with higher average copper concentration and lower indium concentration showed increased carrier collection than neighboring grains with lower copper and higher indium concentration. We also investigated the overall composition dependence of carrier collection in CIGS films and show that 30% gallium content devices show a correlation between charge carrier collection, while 60% content devices do not.

Original languageEnglish (US)
Title of host publication2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Print)9781479979448
StatePublished - Dec 14 2015
Event42nd IEEE Photovoltaic Specialist Conference, PVSC 2015 - New Orleans, United States
Duration: Jun 14 2015Jun 19 2015


Other42nd IEEE Photovoltaic Specialist Conference, PVSC 2015
Country/TerritoryUnited States
CityNew Orleans


  • current measurement
  • microstructure
  • photovoltaic cells
  • synchrotron radiation
  • thin films

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials


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