Modulated surface texturing of temporary Al foils substrates for high-efficiency thin-film, flexible solar cells

Conference paper (2020)

Authors

G. Limodio Photovoltaic Materials and Devices - EEMCS
Davide Bartesaghi HyET Solar Netherlands
Maurice Hietkamp HyET Solar Netherlands
Edward A.G. Hamers HyET Solar Netherlands
A.H.M. Smets Photovoltaic Materials and Devices - EEMCS
Research Group
Photovoltaic Materials and Devices (EEMCS) (TU Delft)
Copyright: © 2020 G. Limodio, Davide Bartesaghi, Maurice Hietkamp, D. Rajagopal, Sajith Nawaratne, Edward Hamers, A.H.M. Smets
DOI: https://doi.org/10.1109/PVSC45281.2020.9300722
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Published Date

2020

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Photovoltaic Materials and Devices

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.

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