Optimization of light trapping in ultrathin nonhomogeneous CuIn1-ξGaξSe2 solar cell backed by 1D periodically corrugated backreflector

Faiz Ahmad, Tom H. Anderson, Peter B. Monk, Akhlesh Lakhtakia

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

8 Scopus citations


We studied the optimization of an ultrathin CuIn1-ξGaξSe2 (CIGS) solar cell with a nonhomogeneous CIGS absorber layer and backed by a 1D metallic periodically corrugated back-reflector (PCBR) with a rectangular profile. Nonhomogeneity in the CIGS absorber layer was modeled through either a sinusoidal or a linear bandgap variation along the thickness direction. The maximum power density for the AM1.5G spectrum was determined from the spectrum of the useful solar absorptance computed using the rigorous coupled-wave approach. Ultrathin solar cells with optimized PCBR and homogenous bandgap depending on the thickness of the CIGS layer were found to deliver the best photonic absorption characteristics. The open-circuit voltage, efficiency, and fill factor were calculated for the optimal designs using values of the reverse-saturation current density, ideality factor, and the series resistance density obtained from experimental results. The overall trend is that the effect of the PCBR becomes less prominent as the thickness of the CIGS absorber layer increases. Higher efficiency and fill factor can be achieved with a solar cell containing as 400-nm-thick CIGS layer compared to the conventional solar cell with a 2200-nm-thick CIGS layer.

Original languageEnglish (US)
Title of host publicationNanostructured Thin Films XI
EditorsTom G. Mackay, Akhlesh Lakhtakia
ISBN (Electronic)9781510620339
StatePublished - 2018
EventNanostructured Thin Films XI 2018 - San Diego, United States
Duration: Aug 22 2018Aug 23 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherNanostructured Thin Films XI 2018
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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