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- W3199280873 abstract "Cadmium-free buffer layers deposited by a dry vacuum process are mandatory for low-cost and environmentally friendly Cu(In1-xGax)Se2 (CIGS) photovoltaic in-line production. Zn(O,S) has been identified as an alternative to the chemical bath deposited CdS buffer layer, providing comparable power conversion efficiencies. Recently, a significant efficiency enhancement has been reported for sputtered Zn(O,S) buffers after an annealing treatment of the complete solar cell stack; the enhancement was attributed to interdiffusion at the CIGS/Zn(O,S) interface, resulting in wide-gap ZnSO4 islands formation and reduced interface defects. Here, we exclude interdiffusion or island formation at the absorber/buffer interface after annealing up to 200 °C using high-resolution scanning transmission electron microscopy (HR-STEM) and energy-dispersive X-ray spectroscopy (EDX). Interestingly, HR-STEM imaging reveals an epitaxial relationship between a part of the Zn(O,S) buffer layer grains and the CIGS grains induced by annealing at such a low temperature. This alteration of the CIGS/buffer interface is expected to lead to a lower density of interface defects, and could explain the efficiency enhancement observed upon annealing the solar cell stack, although other causes cannot be excluded." @default.
- W3199280873 created "2021-09-27" @default.
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- W3199280873 date "2021-09-13" @default.
- W3199280873 modified "2023-10-01" @default.
- W3199280873 title "Atomic-Scale Interface Modification Improves the Performance of Cu(In<sub>1–<i>x</i></sub>Ga<sub><i>x</i></sub>)Se<sub>2</sub>/Zn(O,S) Heterojunction Solar Cells" @default.
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- W3199280873 doi "https://doi.org/10.1021/acsami.1c10251" @default.
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