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Title:
 
Front- and Rear-Emitter Screen Printed Silicon Heterojunction Solar Cells with >20% Efficiency
 
Author(s):
 
S.Y. Herasimenka, W.J. Dauksher, C.J. Tracy, J. Lee, A. Augusto, H. Jain, K. Tyler, Z. Kiefer, P. Balaji, S. Bowden, C. Honsberg
 
Keywords:
 
Heterojunction, Silicon (Si), Solar Cell, Efficiency
 
Topic:
 
WAFER-BASED SILICON SOLAR CELLS AND MATERIALS TECHNOLOGY
Subtopic: Silicon Solar Cell Improvements
Event: 31st European Photovoltaic Solar Energy Conference and Exhibition
Session: 2AV.3.18
 
Pages:
 
761 - 764
ISBN: 3-936338-39-6
Paper DOI: 10.4229/EUPVSEC20152015-2AV.3.18
 
Price:
 
 
0,00 EUR
 
Document(s): paper
 

Abstract/Summary:


The results from the silicon heterojunction (SHJ) pilot line established at Arizona State University Solar Power Laboratory are presented. The pilot line is producing both front- and rear-emitter SHJ cells with 20.3% mean efficiency as well as bifacial cells with 20% front- and 19.5% rear-side efficiency. We also report 19% SHJ cells on 50-μm-thick wafers. The structure and optimization of the front- and rear-emitter cells is described. The key process improvements included (1) using IZO to achieve a good ohmic contact with (p+)a-Si layers, and using (n+)μc-Si as well as highly defective (n+)a-Si layers to ensure good ohmic contact with ITO; (2) using H2 plasma treatments of (i)a-Si layers to improve surface passivation; and (3) optimization of a-Si layers thickness to reduce optical and series resistance losses. Finally, an analysis of loss mechanisms in a 20% full wafer screen printed SHJ cell is presented and a roadmap towards 23% efficiency is discussed.