NDLI: A-Si:H/c-Si heterojunctions: a future mainstream technology for high-efficiency crystalline silicon solar cells?

Content Provider	IEEE Xplore Digital Library
Author	Ballif, C. Barraud, L. Descoeudres, A. Holman, Z.C. Morel, S. De Wolf, S.
Copyright Year	2012
Description	Author affiliation: Ecole Polytechnique Fédérale de Lausanne (EPFL), Institute of Microengineering (IMT), Photovoltaics and Thin-Film Electronics Laboratory, Breguet 2, 2000 Neuchâtel, Switzerland (Ballif, C.; Barraud, L.; Descoeudres, A.; Holman, Z.C.; Morel, S.; De Wolf, S.)
Abstract	In this contribution, we shortly review the main features of amorphous /crystalline silicon heterojunction (SHJ) solar cells, including interface defects and requirements for high quality interfaces. We show how a process flow with a limited number of process steps leads to screen printed solar cells of $2×2cm^{2}$ with 21.8% efficiency and of $10×10cm^{2}$ with 20.9% efficiency (n-type FZ). We show that the devices work in high injection conditions of $3×10^{15}cm^{−3}$ at the maximum power point, a factor two higher than the base doping. Several research labs and companies can now produce large area 6″ cells well over 20% on CZ wafers and some of the critical cost factors, such a metallization can be overcome with suitable strategies. Based on the high quality coating tools and processes developed for thin films used for flat panel display or thin film solar cell coatings, the deposition of the layers required to make SHJ cells has the potential to be performed in a controlled way at low cost. Considering the few process steps required, the high quality n-type Cz wafers that can be obtained by proper crystal growth control, SHJ technology has several assets that could make it become a widespread PV technology.
Starting Page	001705
Ending Page	001709
File Size	332361
Page Count	5
File Format	PDF
ISBN	9781467300643
ISSN	01608371
e-ISBN	9781467300667
DOI	10.1109/PVSC.2012.6317924
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-06-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Silicon Films Photovoltaic cells Cleaning Annealing Argon Lead crystalline silicon silicon heterojunction solar cells amorphous silicon
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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