Dresden 2017 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 64: Poster: Photovoltaics and Optics

HL 64.30: Poster

Wednesday, March 22, 2017, 15:00–19:00, P1C

Absorber surface treatment and alternative buffer layers for Cu₂ZnSn(S,Se)₄ solar cells — •Markus Neuwirth¹, Elisabeth Seydel¹, Michael Wolf¹, Lwitiko Mwakyusa¹, Thomas Schnabel², Erik Ahlswede², Heinz Kalt¹, and Michael Hetterich¹ — ¹Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — ²Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany

Solar cells based on Cu₂ZnSn(S,Se)₄ (CZTSSe) are promising since they only comprise environmentally friendly and earth-abundant elements. However, they still struggle with low efficiencies, mainly related to a high open-circuit voltage deficit that could partially result from the presence of secondary phases in the absorber layer. These phases can be especially problematic at the absorber’s surface where they influence the CZTSSe/CdS interface. Surface treatments like chemical etching can remove such parasitic phases and improve the interface quality. Alternative buffer layers like ZnSe may also improve the interface quality and modify the band alignment in the interface region. In this contribution we compare CZTSSe solar cells with alternative buffer layers and previous absorber surface treatments to solar cells with chemical bath deposited CdS buffer layer.