Highly Efficient Lightweight Flexible Cu(In,Ga)Se₂ Solar Cells with a Narrow Bandgap Fabricated on Polyimide Substrates: Impact of Ag Alloying, Cs and Na Doping, and Front Shallow Ga Grading on Cell Performance.

ABSTRACT: Herein, lightweight, flexible Cu(In,Ga)Se₂ (CIGS) solar cells with a narrow bandgap of ≈1 eV are grown on polyimide substrates. The poor performance of the CIGS solar cells owing to a low growth temperature (≈400 °C) is considerably improved via Ag alloying, Na doping using alkali-silicate-glass thin layers (ASTLs) and the CsF postdeposition treatment (CsF-PDT), and front shallow Ga grading (surface field; SF). Along with improved device process, a notably high conversion efficiency of 21.2%, low V _OC deficit of 0.346 V, and high J _SC of ≈40 mA cm^-2 are achieved. Ag alloying and Na doping using ASTLs predominantly improve the CIGS bulk quality, while the CsF-PDT and SF reduce carrier recombination at the CIGS/CdS interface and vicin

SUBMITTER: Kamikawa Y 

PROVIDER: S-EPMC11934904 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature