Presentation Details
| Polymer-Modified Wide Bandgap Perovskites for Stable Tandem Top Cell Deposited in Open-Air Muneeza Ahmad, Rayna Hylden, Nicholas Rolston. Arizona State University, Tempe, AZ, USA |
Abstract
Mixed-halide perovskite compositions have been widely used for their ideal bandgap for tandem devices; however, achieving reproducible films with a stable phase under operation remains a challenge. Our work involves using a high molecular weight polyvinylpyrrolidone (PVP) polymer additive to improve the ink rheology and make it compatible with an open-air quench-free blade coating process. The polymer-modified ink produces more uniform and homogenous films with better optoelectronic performance with no effect on the crystal structure. This additive is compatible with different wide bandgap compositions and demonstrates UV-stability for unencapsulated samples up to 100 hours of direct UVA light exposure under ambient conditions. We propose a passivation of defects and the environmental stability of the perovskite film mediated by a polymer matrix.
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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.