Presentation Details
| Improved Mechanical Robustness and Durability Enabled by Textured Wafers and Interlayers in Perovskite-Silicon Tandem Solar Cells (yes) Muzhi Li1, Mathilde Fievez2, Zhengshan Yu2, Nicholas Rolston1. 1Materials Science and Engineering, Fulton Schools of Engineering, Arizona State University, Tempe, AZ, USA.2Beyond Silicon, Tempe, AZ, USA |
Abstract
State-of-the-art perovskite-silicon tandem solar cells with high power conversion efficiency (PCE) commonly employ mechanically fragile materials, namely fullerene-based electron transport layers. Therefore, despite rapid advances in PCE, stability concerns have significantly hindered commercialization potential. Here, we first investigate combined environmental and mechanical reliability of perovskite-silicon tandem solar cells on different types of Si bottom cells and by quantifying their fracture energy (Gc) under two accelerated aging conditions: thermal cycling and combined light-and-heat exposure. Notably, we observe a substantial improvement in the mechanical integrity of C60-containing tandem devices when fabricated on rougher substrates, specifically textured Si wafers. The results also reveal a linear relationship between Gc and substrate roughness, with increasing roughness enhancing the Gc of C60-containing stacks from approximately 0.5 J·m-2 on float-zone wafers to values exceeding 1 J·m-2 on textured wafers. Furthermore, light+heat aging induces pronounced degradation of Gc in devices fabricated on both textured and float-zone (FZ) silicon wafers, whereas thermal cycling leads to Gc degradation in FZ wafers but not in those based on textured wafers. We propose strategies that improve and retain adhesion under light-and-heat aging using buffer or polymer interlayers that have more robust bonding to perovskite and act as ion diffusion barriers. These findings highlight a direct link between changes in mechanical integrity and operational degradation modes, offering valuable insights for the design of durable perovskite-silicon tandem 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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