Back contact passivation with Ga-grading in narrow bandgap (Ag,Cu)(In,Ga)Se<sub>2</sub> bifacial solar cells on In<sub>2</sub>O<sub>3</sub>:Sn back contact
This study investigates the effect of Ga-grading in narrow bandgap (Ag,Cu)(In,Ga)Se<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> (ACIGS) bifacial solar cells on In<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</inf>:Sn (ITO) transparent substrates. It is found that the performance of cells on ITO equals or supersedes the performance of reference cells made on Mo. Up to 60% bifaciality was found for the cells on ITO. At the ACIGS/ITO interface a layer of 3 nm GaO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">x</inf> is identified with STEM and is believed to have a passivating effect on the back contact. An increase in the steepness of the Ga-grading results in better overall performance for front and rear side measurements, which likely indicates an added rear-contact passivation effect.
Authors
- Klara Kiselman (ORCID: https://orcid.org/0009-0002-5591-7572)
- Patrick Pearson (ORCID: https://orcid.org/0000-0001-9972-4655)
- Marika Edoff (ORCID: https://orcid.org/0000-0003-4111-4613)
- Olivier Donzel‐Gargand (ORCID: https://orcid.org/0000-0002-2101-3746)
- André Violas (ORCID: https://orcid.org/0009-0001-6858-6680)
- Pedro M. P. Salomé (ORCID: https://orcid.org/0000-0002-1050-2958)
- Lars Stolt
- E. P. Yakovleva
Institutions
- Uppsala University (SE)
- International Iberian Nanotechnology Laboratory (PT)
Publication Details
- Published
- 2025-06-08
- DOI
- https://doi.org/10.1109/pvsc59419.2025.11133411
- Citations
- 1
- Primary Topic
- Chalcogenide Semiconductor Thin Films
- Type
- article
- Field-Weighted Citation Impact
- 0.73