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  Wang, L.; Lin, X.; Ennaoui, A.; Wolf, C.; Lux-Steiner, M.; Klenk, R.: Solution-processed In₂S₃ buffer layer for chalcopyrite thin film solar cells. EPJ Photovoltaics 7 (2016), p. 70303/1-5

10.1051/epjpv/2016001
Open Access Version

Abstract:
We report a route to deposit In2S3 thin films from air-stable, low-cost molecular precursor inks for Cd-free buffer layers in chalcopyrite-based thin film solar cells. Different precursor compositions and processing conditions were studied to define a reproducible and robust process. By adjusting the ink properties, this method can be applied in different printing and coating techniques. Here we report on two techniques, namely spin-coating and inkjet printing. Active area efficiencies of 12.8% and 12.2% have been achieved for In2S3-buffered solar cells respectively, matching the performance of CdS-buffered cells prepared with the same batch of absorbers.