Presentation Details
| Vacuum Coating Strategies to Minimize Interface Voltage Loss in Perovskite Solar Cells Isaac B.Ogunniranye, Haoran Chen, Kshitiz Dolia, Scott L.Wenner, Kiran Lamichhane, Michael J.Heben, Randy J.Ellingson, Yanfa Yan, Zhaoning Song. The University of Toledo, Toledo, OH, USA |
Abstract
Perovskite solar cells (PSCs) have achieved remarkable efficiencies, yet voltage losses from interfacial recombination remain critical. We investigate processing-induced damage resulting from direct vacuum deposition of functional materials onto perovskite surfaces using photophysical analysis and microstructural characterization. We find that high-energy magnetron sputtering severely degrades perovskite films and induces voltage losses exceeding 259 mV. Conversely, atomic layer deposition (ALD) and thermal evaporation preserve material crystallinity and morphology. An ALD-deposited Al2O3 coating directly on top of the perovskite film provides superior passivation, achieving an external radiative efficiency of 2.26%, a quasi-Fermi level splitting of 1.157 eV, and a reduction in non-radiative recombination by ~100 mV. Bifacial p-i-n PSCs with SnOx/IZO back-contact architecture achieve 21% efficiency with VOC of 1.169V. This work establishes ALD as the optimal damage-free method for direct functional coating and voltage-loss minimization in high-performance PSCs.
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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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