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      Sudden stress relaxation in compound semiconductor thin films triggered by secondary phase segregation

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          Potassium-induced surface modification of Cu(In,Ga)Se2 thin films for high-efficiency solar cells

          Thin-film photovoltaic devices based on chalcopyrite Cu(In,Ga)Se2 (CIGS) absorber layers show excellent light-to-power conversion efficiencies exceeding 20%. This high performance level requires a small amount of alkaline metals incorporated into the CIGS layer, naturally provided by soda lime glass substrates used for processing of champion devices. The use of flexible substrates requires distinct incorporation of the alkaline metals, and so far mainly Na was believed to be the most favourable element, whereas other alkaline metals have resulted in significantly inferior device performance. Here we present a new sequential post-deposition treatment of the CIGS layer with sodium and potassium fluoride that enables fabrication of flexible photovoltaic devices with a remarkable conversion efficiency due to modified interface properties and mitigation of optical losses in the CdS buffer layer. The described treatment leads to a significant depletion of Cu and Ga concentrations in the CIGS near-surface region and enables a significant thickness reduction of the CdS buffer layer without the commonly observed losses in photovoltaic parameters. Ion exchange processes, well known in other research areas, are proposed as underlying mechanisms responsible for the changes in chemical composition of the deposited CIGS layer and interface properties of the heterojunction.
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            High‐efficiency CuInxGa1−xSe2solar cells made from (Inx,Ga1−x)2Se3precursor films

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              Current issues in recrystallization: a review

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                Author and article information

                Journal
                PRBMDO
                Physical Review B
                Phys. Rev. B
                American Physical Society (APS)
                1098-0121
                1550-235X
                October 2015
                October 2015
                : 92
                : 15
                Article
                10.1103/PhysRevB.92.155310
                0bb9b06f-8116-44cc-887b-23cbaed491e3
                © 2015

                http://link.aps.org/licenses/aps-default-license

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