Presentation Details
| Hybrid-Processed 1.61 eV Wide-Bandgap Perovskite Solar Cells Achieving 22% Efficiency Jin Ho Yang, Yeonwoo Park, Jae Ho Yun. KENTECH(Korea Institute of Energy Technology), Naju-si, South Korea |
Abstract
We demonstrate a hybrid-processed wide-bandgap perovskite solar cell with an optical bandgap of 1.61 eV, targeting top-cell applications in silicon tandem photovoltaics. In this approach, vacuum-deposited inorganic precursor layers (PbI₂ and CsBr) are converted using a mixed-halide solution precursor (MABr, MACl, and FAI) followed by a post-crystallization step, enabling stepwise control of composition and crystallization. To improve conversion homogeneity and reduce defect formation, we investigated the effects of a small DMF additive (1%) and spin-coating speed (2000–4000 rpm) on film quality and device performance. Under the optimized condition of 4000 rpm, DMF addition, Voc increased from 1.11 to 1.17 V and FF improved from 81.64% to 83.98%, leading to an increase in reverse-scan PCE from 20.68% to 22.07%. The forward-scan PCE also increased from 18.43% to 21.38%, and the reduced scan mismatch indicates mitigated hysteresis. These results highlight precursor infiltration and interfacial defect control as key factors for achieving both reproducibility and high performance in 1.6 eV-class wide-bandgap perovskite top cells for silicon tandem photovoltaics.
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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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