`
`ELSEVIER
`
`Available online at www.5ciencedirect.com
`
`SCIENCE C DmEc"
`
`Solar Energy Materlals
`8: Solar Cells
`
`Solar Energy Materials & Solar Cells 90 (2006) 130871321
`wwwelseviercom/1ocate/ solmat
`
`Evaluation of InGaP/InGaAs/Ge triple—junction
`solar cell and optimization of solar cell’s structure
`focusing on series resistance for high-efficiency
`concentrator photovoltaic systems
`
`Kensuke Nishiokaa’*, Tatsuya Takamotob, Takaaki Aguib,
`Minoru Kaneiwab, Yukiharu Uraokac, Takashi FuyukiC
`
`aGraduate School of Materials Science, Japan Advanced Institute of Science and Technology, 1—] Asahidai,
`Nomi, Ishikawa 923—1292, Japan
`bSHARP Corporation, 282-] Hajikami, Shinjo-cno, Kitakatsaragi—gun, Nara 639-2198, Japan
`CGraduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma,
`Nara 630-0101, Japan
`
`Received 26 April 2005; received in revised form 12 August 2005; accepted 12 August 2005
`Available online 29 September 2005
`
`Abstract
`
`The series resistance of an InGaP/InGaAs/Ge triple-junction solar cell was evaluated in detail.
`Series resistance components such as electrode resistance,
`tunnel junction resistance and lateral
`resistance between electrodes were estimated separately. The characteristics of the triple-junction
`solar cell under concentrated light were evaluated by equivalent circuit calculation with a simulation
`program with integrated circuit emphasis
`(SPICE). By equivalent circuit calculation,
`the
`optimization of cell designs was performed, focusing on series resistance and cell current in order
`to realize high-efficiency concentrator cells.
`© 2005 Elsevier B.V. All rights reserved.
`
`Keywords: Triple-junction solar cell; Series resistance; Circuit calculation; Concentrated light; SPICE
`
`*Corresponding author. Tel.: + 81761511562; fax: + 8176151 1149.
`E—mail address: nishioka@jaist.ac.jp (K. Nishioka).
`
`0927—0248/55 — see front matter © 2005 Elsevier B.V. All rights reserved.
`doi:10.1016/j.solmat.2005.08.003
`
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