Presentation Details
| Thin Bilayer CdSeTe/CdTe Solar Cells Lilly Quintana - Barrera, James R.Sites. Colorado State University, Fort Collins, CO, USA |
Abstract
CdSeTe/CdTe thin-film solar cells with total absorber thicknesses between 0.6 and 1.5-µm were fabricated by close-space sublimation and all achieved efficiencies above 14.9%. Absorbers consisted of 100, 250, and 500-nm of CdSeTe (CST) followed by 500 or 1000-nm of CdTe. A standard 3-µm bilayer (500-nm CST/2500-nm CdTe) was also fabricated as a reference device. The thin absorber layers were deposited on an 80-nm MgZnO window layer and processed using the same CdCl2 treatment, Cu doping, and Te back-surface treatment, followed by colloidal carbon/Ni back contacts. Devices were electrically and optically characterized to investigate how reducing the absorber thickness affects device performance. The highest efficiency of 17.7% was obtained with a 1.1-µm absorber, while a sub-micron device with a 750-nm absorber achieved 16.2% efficiency, demonstrating strong performance at reduced thickness. For a fixed CdTe thickness, reducing the CST layer led to an increase in open-circuit voltage (Voc). These results show that CST/CdTe devices can maintain high performance even with sub-micron and micron-scale absorbers, which could reduce material use, energy consumption during deposition, and overall processing time for manufacturing.
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.