Presentation Details
| Halide Perovskite Phase Transitions.How They Work and How to Watch Them. Jeffrey Christians. Hope College, Department of Engineering, Holland, MI, USA |
Abstract
Of all the photovoltaic (PV) technologies competing to pick up the torch from silicon and begin the “next-generation” of PV, halide perovskites appear to be the front runners. It appears that if they fail to become the market leader it will be directly due to durability challenges. In this work, we discuss learnings gained over the years regarding the phase instability of halide perovskites. Practical aspects of the phase transition are discussed as are methods for analysis and imaging. Specifically, optical absorption, scanning electron microscopy, and visible microscopy are discussed as primary measurement techniques with additional insight from compositional studies. We determine aspects of the kinetics, highlight the importance of surface chemistry and defects in the nucleation on non-perovskite phases, and track phase growth across domain and crystal grain boundaries in thin films. Taken together, this work provides a deeper picture of the phase instability of halide perovskites which can assist researchers working to engineering more phase-stable halide perovskite materials for PV and other applications.
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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.