Presentation Details
| Neutralization of the impact of belt speed on screen printed copper metallization by LECO on PERC homogeneous emitter Abasifreke Ebong1, Donald Intal1, Sandra Huneycutt1, Ajeet Rohatgi2, Vijay Upadhyaya2, Sagnik Dasgupta2, Ruohan Zhong2, Thad Druffel3, Ruvini Dharmadasa3. 1University of North Carolina at Charlotte, Charlotte, NC, USA.2Georgia Institute of Technology, Atlanta, GA, USA.3Bert Thin Films LLC, Louisville, KY, USA |
Abstract
Copper fire-through metallization is a cost-effective alternative to Ag counterpart for industrial high efficiency solar cells. The fire through dielectric metallization relies on belt speed, which dictates the ramp up and ramp down rates for effective contact formation. In this paper three belt speeds (325oC, 360oC, 390oC) at constant peak firing temperature, were used to process PERC (homogeneous emitter) cells. After the contact firing the electrical parameters were dependent on belt speed, but after LECO treatment, they were identical. The SEM/EDS cross sectional analyses showed increased elemental Cu with belt speed, and the series resistance was lowest for the middle belt speed before LECO. However, after the LECO treatment, the series resistance dropped, respectively, to 0.503 Ωcm-2, 0.428 Ωcm-2 and 0.500 Ωcm-2 leading to efficiency of 20.8% on homogeneous PERC emitter.
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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.