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A Low Concentration Receiver Concept for Cost Effective Crystalline Back Contact Cells

: Ebert, M.; Dörsam, T.; Fellmeth, T.; Hädrich, I.; Eitner, U.; Biro, D.; Wiesenfarth, M.; Noriega, P.; Caparros, S.; Castano, F.


Institute of Electrical and Electronics Engineers -IEEE-:
40th IEEE Photovoltaic Specialist Conference, PVSC 2014 : Denver, Colorado, 08.06.2014-13.06.2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-4398-2
ISBN: 978-1-4799-4397-5
Photovoltaic Specialists Conference (PVSC) <40, 2014, Denver/Colo.>
Conference Paper
Fraunhofer ISE ()
Photovoltaische Module; Systeme und Zuverlässigkeit; III-V und Konzentrator-Photovoltaik; Photovoltaische Module und Kraftwerke; Konzentrator-Bauelemente; Modulentwicklung; CPV; interconnection; cells; receiver; contact cells

A versatile interconnection and receiver concept for back contact low concentrating crystalline solar cells is presented. The key feature is the AP-C-MWT cell which allows for any cell formats as a multiple of 22.5 × 10 mm2. We demon-strate the feasibility of an adequate receiver concept and show the electrical optimization steps for a given concentration. The steps include the electrical finite-element-method (FEM) simula-tion of the interconnector conductivity and an analytical model to derive the optimal geometric design. Finally measured efficiency data for a built prototype are reported, showing a receiver effi-ciency based on string area of 19.2% (C=9.9) and a cell to receiv-er efficiency of 99.3%.