NDLI: Characterization of Laser-Doped Localized p-n Junctions for High Efficiency Silicon Solar Cells

Content Provider	IEEE Xplore Digital Library
Author	Fell, A. Surve, S. Franklin, E. Weber, K.J.
Copyright Year	1963
Abstract	To further increase the efficiency of industrial crystalline silicon solar cells, a point-contact solar cell concept with localized p-n junctions is considered a promising candidate if implemented by a low cost processing technique like laser doping. For efficient development and optimization of such a processing technique, we present a dedicated test structure to derive the fundamental diode characteristics specific to the localized p-n junction, namely the contact resistance to the metal and the recombination properties, i.e., the dark saturation current. Those properties are fitted to measured dark current-voltage curves by 3-D device simulations using Quokka. We show that in particular, the contact resistance can be accurately extracted and that the method is robust against uncertainties of other device properties of the test structure. Simulations of an idealized point-contact solar cell are performed to judge the usefulness of the extractable value range with respect to the efficiency potential. Furthermore, we apply the method to laser doping experiments. We successfully characterize the recombination and contact resistance and identify a ~24% efficiency potential of a nonoptimized two-step laser doping process. Other single step processes show a very high recombination (J_0pn ≫ 1e^-10 A/cm²) likely due to imperfections around the perimeter of the laser processed area.
Sponsorship	IEEE Electron Devices Society
Starting Page	1943
Ending Page	1949
Page Count	7
File Size	2313702
File Format	PDF
ISSN	00189383
Volume Number	61
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	P-n junctions Semiconductor lasers Photovoltaic cells Conductivity Sensitivity Doping Metals solar cell. Conductive boundary modeling quasi- neutrality Quokka simulation solar cell quasi-neutrality
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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