Modulated surface texturing of temporary Al foils substrates for high-efficiency thin-film, flexible solar cells
Gianluca Limodio (TU Delft - Photovoltaic Materials and Devices)
Davide Bartesaghi (HyET Solar Netherlands)
Maurice Hietkamp (HyET Solar Netherlands)
Sajith Nawaratne (Student TU Delft)
Edward A.G. Hamers (HyET Solar Netherlands)
Arno H.M. Smets (TU Delft - Photovoltaic Materials and Devices)
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Abstract
In this work we focus on texturing Al substrate in order to employ the modulated surface texturing approach for thin-film, flexible, micromorph solar cells. We deployed two different methods to induce micro-craters in Al foil, i) bare Al etching by KOH and ii) AZO sacrificial layer etched in KOH. After modelling the etching kinetics of KOH on Al, we characterized the 2D correlation length and rms roughness of these samples and find the optimal aspect ratio of 12% to deposit high-quality 3 µm-thick nc-Si. Finally, excellent angular scattering properties have been measured for both employed methods.