Presentation Details
| Nanoscale Visualization of Charge Carrier Transport and Recombination in Perovskite Photovoltaics Dane W.deQuilettes. Princeton University, Princeton, NJ, USA |
Abstract
The performance of photovoltaics can largely be attributed to the fine control of local charge carrier populations and their distributions. Charge carrier transport and recombination throughout a device stack are often controlled by several sources including charge traps, band bending, and phonons. Uncovering a clear picture of charge carrier behavior upon photoexcitation has been an ongoing challenge that often requires detailed nanoscale studies and a combination of characterization tools that can probe structure, stoichiometry, electronic structure, and the ultrafast dynamics of charge carriers. Here, we demonstrate several new approaches to directly visualize the nanoscale features that govern energy transport in polycrystalline perovskites. One key finding is that diffusion can be anisotropic and largely dependent on crystal structure and grain orientation. These results identify pathways to engineer materials at the nanoscale to achieve better PV performance.
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.
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.