Presentation Details
| Multi-Resonant Light Trapping in Ultrathin Cu(In, Ga)Se2 Solar Cells: From Concept to Design Rules (yes) Merve Demir1, Daniel Jimenez1, Bodo Fuhrmann2, Matthias Maiberg1, Marcel Schrader1, Paul Rondt1, Heiko Kempa1, Alexander Sprafke1, 2, Roland Scheer1. 1Institute of Physics, Martin Luther University Halle Wittenberg, Halle (Saale), Germany.2Interdisciplinary Center of Materials Science, Martin Luther University Halle Wittenberg, Halle (Saale), Germany |
Abstract
Ultrathin Cu(In,Ga)Se₂ (CIGSe) solar cells enable cost-effective large-scale production and applications such as bifacial and tandem devices by reducing absorber thickness. However, pronounced back-contact recombination and incomplete optical absorption limit device performance. Nanotextured back contacts are considered a promising approach to simultaneously provide electrical passivation and light trapping, yet the optimal nanostructure design remains unresolved. In this work, a light-management concept based on functional back contacts is investigated to identify optimal nanotexturing parameters and minimize optical and electronic losses. By combining systematic optical simulations with a realistic growth model, clear design guidelines for nanotexturing parameters were identified. The experimentally realized devices confirm the predicted optical trends and exhibit enhanced photocurrent. External quantum efficiency measurements reveal pronounced optical gains in the near-infrared range between 800 and 1200 nm. However, implementation of nanotextured back contacts also leads to decrease in open circuit voltage. Therefore, in order to capture the trade-off between effective light trapping and carrier collection, optoelectronic simulations accounting for carrier recombination were employed. Combined opto-electronic simulation results show quantitative agreement with measured EQE spectra. These findings highlight the necessity of jointly optimizing optical and electronic effects in nanotextured ultrathin CIGSe architectures and provide a framework for the rational design of light-management strategies in next generation thin film solar cells.
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No part of this publication may be reproduced, distributed, or transmitted in any form or by any means, including photocopying, recording, or other electronic or mechanical methods, without the prior written permission of the author.
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