Interdigitated back-contacted structure: A different approach towards high-efficiency ultrathin copper indium gallium (di)selenide solar cells

Nasim Rezaei, Paul Procel , Marcel Simor, Zeger Vroon, Miro Zeman, Olindo Isabella

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
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Abstract

An interdigitated back-contacted (IBC) configuration is proposed for submicron copper indium gallium (di)selenide (CIGS). In a modelling platform, the structure was opto-electrically optimized for maximum efficiency. The results are compared with a reference front/back-contacted (FBC) solar cell with similar absorber thickness and exhibiting 11.9% efficiency. The electrical passivation at the front side is accomplished by an Al2O3 layer, which is endowed with negative fixed charges. The results indicate that with an optimal geometry and engineered bandgap grading, the efficiency of the new IBC structure can reach 17%. Additionally, with a reasonably low defect density in the absorber layer, efficiencies as high as 19.7% and open-circuit voltage comparable with that of the record solar cell are possible with the IBC structure.

Original languageEnglish
Pages (from-to)899-908
Number of pages10
JournalProgress in Photovoltaics: research and applications
Volume28
Issue number9
DOIs
Publication statusPublished - 2020

Keywords

  • bandgap grading
  • CIGS solar cells
  • electrical modelling
  • IBC
  • light management

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