NDLI: Decoupling charge carrier collection and metallization geometry of back-contacted back-junction silicon solar cells by using insulating thin films

Content Provider	IEEE Xplore Digital Library
Author	Reichel, C. Reusch, M. Granek, F. Hermle, M. Glunz, S.W.
Copyright Year	2010
Description	Author affiliation: Fraunhofer Institute for Solar Energy Systems (ISE), Heidenhofstr. 2, 79110 Freiburg, Germany (Reichel, C.; Reusch, M.; Granek, F.; Hermle, M.; Glunz, S.W.)
Abstract	Back-contacted back-junction silicon solar cells with a large emitter coverage (point-like base contacts) and a small emitter coverage (point-like emitter and base contacts) have been fabricated and analyzed. These solar cells feature an insulating thin film on the rear side in order to decouple the charge carrier collection geometry and the geometry of the metallization. It has been found, that for the investigated solar cells an increased collection efficiency is observed due to a significant reduction of electrical shading losses. Thus, high short-circuit currents could be achieved for both solar cell structures. Different insulating thin films, such as ALD Al and PECVD SiO have been investigated. It has been found that ALD layers are already insulating for a thinner film thickness. By applying these insulating thin films to the investigated solar cell structures no significant shunts are introduced. For solar cells on 1 Ωcm n-type material and with a large emitter coverage an efficiency of 21.9% (V = 673 mV, J = 40.6 $mA/cm^{2},$ FF = 80.1%) could be obtained and for solar cells with a small emitter coverage an efficiency of 22.7% (V = 706 mV, J = 41.0 $mA/cm^{2},$ FF = 78.5%) has been achieved.
Starting Page	001034
Ending Page	001038
File Size	770172
Page Count	5
File Format	PDF
ISBN	9781424458905
ISSN	01608371
e-ISBN	9781424458929
DOI	10.1109/PVSC.2010.5614640
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-06-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Photovoltaic cells Silicon Metallization Aluminum oxide Leakage current Photovoltaic systems
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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