NDLI: >21% Efficient Silicon Heterojunction Solar Cells on n- and p-Type Wafers Compared

Content Provider	IEEE Xplore Digital Library
Author	Descoeudres, A. Holman, Z.C. Barraud, L. Morel, S. De Wolf, S. Ballif, C.
Copyright Year	2011
Abstract	The properties and high-efficiency potential of front- and rear-emitter silicon heterojunction solar cells on n- and p-type wafers were experimentally investigated. In the low-carrier-injection range, cells on p-type wafers suffer from reduced minority carrier lifetime, mainly due to the asymmetry in interface defect capture cross sections. This leads to slightly lower fill factors than for n-type cells. By using high-quality passivation layers, however, these losses can be minimized. High open-circuit voltages (V_ocs) were obtained on both types of float zone (FZ) wafers: up to 735 mV on n-type and 726 mV on p-type. The best V_oc measured on Czochralski (CZ) p-type wafers was only 692 mV, whereas it reached 732 mV on CZ n-type. The highest aperture-area certified efficiencies obtained on 4 cm² cells were 22.14% (V_oc = 727 mV , FF = 78.4%) and 21.38% (V_oc = 722 mV, FF = 77.1%) on n- and p-type FZ wafers, respectively, proving that heterojunction schemes can perform almost as well on high-quality p-type as on n-type wafers. To our knowledge, this is the highest efficiency ever reported for a full silicon heterojunction solar cell on a p-type wafer, and the highest V_oc on any p-type crystalline silicon device with reasonable FF.
Starting Page	83
Ending Page	89
Page Count	7
File Size	1001008
File Format	PDF
ISSN	21563381
Volume Number	3
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photovoltaic cells Heterojunctions Indium tin oxide Silicon Current measurement Density measurement Standards photovoltaic cells Amorphous silicon crystalline silicon heterojunctions
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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