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• W4292808712 endingPage "11338" @default.
• W4292808712 startingPage "11328" @default.
• W4292808712 abstract "K, Rb, and Cs improve Cu(In,Ga)Se2 (CIGS) solar cell performance, but the mechanism remains unclear. Here we use air-free transfer of multiple samples to study KF post-deposition treatments (PDTs) by X-ray photoelectron spectroscopy. The KF PDTs do not change the majority carrier concentration or Cd in-diffusion, but they boost efficiency by 6.1% absolute, improve minority carrier lifetime, and shift the surface valence band further from the Fermi energy. Unlike former reports, the valence-band shift is not a result of lower Cu/(Ga+In) or higher K/(K+Cu) composition ratios. We propose that instead, KF PDTs alter the surface valence-band alignment through a reconstructive phase transformation from chalcopyrite CIGS to K2CuIn3Se6 or KInSe2, which have layered structures. These compounds can leave Cu-free cation planes after K is rinsed away, unlike the structure of chalcopyrite CIGS or CuIn3Se5." @default.
• W4292808712 created "2022-08-24" @default.
• W4292808712 creator A5005172948 @default.
• W4292808712 creator A5005730457 @default.
• W4292808712 creator A5017397438 @default.
• W4292808712 creator A5066087733 @default.
• W4292808712 date "2022-08-23" @default.
• W4292808712 modified "2023-09-28" @default.
• W4292808712 title "K Improves Cu(In,Ga)Se₂ Surface Band Alignment through Reconstruction" @default.
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