Presentation Details
| A study of Se profiles in As doped Cd(Se, Te) photovoltaic devices Eric Colegrove, Josh Brown, Robert Morrissey, Andrea Mathew, Aditya Ratnapagol, Hongling Lott, Ryan Muzzio, Ed Sartor, Matt Young, Craig Perkins, Darius Kuciauskas, Matthew Reese. National Laboratories of the Rockies, Golden, CO, USA |
Abstract
Selenium (Se) alloying is widely used to reduce recombination and enhance photocurrent in cadmium telluride (CdTe) photovoltaics (PV), but Se redistribution during CdCl2 treatment introduces additional complexity that affects absorber chemistry and device performance. In this study, four As-doped Cd(Se,Te) absorber configurations with systematically varied initial Se profiles were designed and fabricated. A one-dimensional diffusion model was used to guide the design of the initial Se distributions and predict post-CdCl₂ profiles. The absorbers were processed both at NLR and as part of the CTAC round-robin in collaboration with First Solar. Compositional depth profiling, optoelectronic measurements, and photoluminescence reveal that while total Se still drives performance, more careful consideration of the initial Se profile and its redistribution during CdCl2 may enable additional benefits. These sample conditions also provide a platform to investigate other phenomena observed in modern CdTe PV.
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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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