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McCandless, Brian E; Buchanan, Wayne A; Thompson, Christopher P; Sriramagiri, Gowri; Lovelett, Robert J; Duenow, Joel; Albin, David; Jensen, Søren; Colegrove, Eric; Moseley, John; Moutinho, Helio; Harvey, Steve; Al-Jassim, Mowafak; Metzger, Wyatt K
Scientific reports, 09/2018, Letnik: 8, Številka: 1Journal Article
Thin film materials for photovoltaics such as cadmium telluride (CdTe), copper-indium diselenide-based chalcopyrites (CIGS), and lead iodide-based perovskites offer the potential of lower solar module capital costs and improved performance to microcrystalline silicon. However, for decades understanding and controlling hole and electron concentration in these polycrystalline films has been extremely challenging and limiting. Ionic bonding between constituent atoms often leads to tenacious intrinsic compensating defect chemistries that are difficult to control. Device modeling indicates that increasing CdTe hole density while retaining carrier lifetimes of several nanoseconds can increase solar cell efficiency to 25%. This paper describes in-situ Sb, As, and P doping and post-growth annealing that increases hole density from historic 10 limits to 10 -10 cm levels without compromising lifetime in thin polycrystalline CdTe films, which opens paths to advance solar performance and achieve costs below conventional electricity sources.
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