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Analysis of backsheet and rear cover reflection gains for bifacial solar cells

: Mittag, M.; Grünzweig, A.; Wiese, M.; Mahmoud, N.; Schmid, A.; Heinrich, M.

Volltext urn:nbn:de:0011-n-5039894 (483 KByte PDF)
MD5 Fingerprint: 6d96f7af9413d50ed77bcaf978e1b32f
Erstellt am: 17.8.2018

Smets, A.:
33rd European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2017 : Proceedings of the international conference held in Amsterdam, The Netherlands, 25 September - 29 September 2017
München: WIP, 2017
ISBN: 978-3-936338-47-8
ISBN: 3-936338-47-7
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <33, 2017, Amsterdam>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
photovoltaisches Modul; Systeme und Zuverlässigkeit; Photovoltaik; Photovoltaische Module und Kraftwerke; Modultechnologie; cell-to-module; CTM; gain; module; simulation

Bifacial solar cells are known to increase module power and performance. Due to their active rear side additional gains are possible from internal reflections. Existing models to analyze cell-to-module (CTM) gains need to be extended. We analyze reflection within modules with bifacial cells and establish a system and a nomenclature for gains resulting from internal reflection. Transmission through the cell, subsequent reflection on module cover layers and a second absorption of light in the solar cell leads to additional gains in the range of 0.5 – 0.8% for bifacial cells in modules with reflecting rear cover materials (i.e. white backsheets) under STC conditions. We present models to calculate gains and perform measurements on bifacial modules with different backsheets and covers. Cover coupling gains for bifacial cells are higher compared to monofacial cells (20%rel in modules with white backsheets).