Title
Interdigitated back-contacted structure: A different approach towards high-efficiency ultrathin copper indium gallium (di) selenide solar cells
Author
Rezaei, N.
Procel, P.
Simor, M.
Vroon, Z.
Zeman, M.
Isabella, O.
Publication year
2020
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.
Subject
Bandgap grading
CIGS solar cells
Electrical modelling
IBC
Light management
To reference this document use:
http://resolver.tudelft.nl/uuid:c5f24201-a343-4698-bca9-611e871daaa9
DOI
https://doi.org/10.1002/pip.3296
TNO identifier
877959
Publisher
Wiley
ISSN
1099-159X
Source
Progress in Photovoltaics, 28 (28)
Document type
article