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Optimized high-efficiency silicon solar cells with Jsc=42 mA/cm2 and eta=23.3%

 
: Glunz, S.W.; Knobloch, J.; Biro, D.; Wettling, W.

:
Volltext urn:nbn:de:0011-n-2095435 (353 KByte PDF)
MD5 Fingerprint: 0fb3451b655abc76aca6e89ef4f35986
Erstellt am: 20.12.2014


Ossenbrink, H.A.:
Fourteenth European Photovoltaic Solar Energy Conference 1997. Proceedings. Vol.1 : International conference held at Barcelona, Spain, 30 June-4 July 1997
Bedford: Stephens, 1997
ISBN: 1-901675-03-5
ISBN: 1-901675-01-9
ISBN: 1-901675-02-7
S.392-395
European Photovoltaic Solar Energy Conference <14, 1997, Barcelona>
Englisch
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Solarzellen - Entwicklung und Charakterisierung; Silicium-Photovoltaik; Kontaktierung und Strukturierung; Herstellung und Analyse von hocheffizienten Solarzellen; Industrielle und neuartige Solarzellenstrukturen

Abstract
In this paper the recent progress in the development of high-efficiency silicon solar cells at Fraunhofer ISE is reported. By a reduction of shadowing losses and an optimization of the anti-reflection coating the efficiency was improved up to 23.3 % on FZ-Si with an excellent short circuit current of 42 mA/cm2. With the optimized scheme a new record value for Cz-Si has been achieved: 22 %. Since the used high-efficiency process is quite complicated, another task was to simplify the process, while keeping the efficiency on a high level (> 20 %). This goal was reached with the RP-PERC process which is around 3 to 4 times less complex, but still leading to efficiencies up to 21.6 %. In the second part of the paper the influence of corona charges on the surface recombination velocity of lifetime test structures and solar cells was studied. The observed dramatic influence - S varies from 10 cm/s to 3000 cm/s, V(ind OC) from -44 mV to +11 mV - is in very good correlation with theoretical predictions. Especially, a cell with interdigitated rear contact grid was a fruitful instrument for this study. Additionally, this cell type is an excellent bifacial cell with efficiencies of 20.6 % and 19.3 % for illumination from the unmetallized and metallized side, respectively.

: http://publica.fraunhofer.de/dokumente/N-209543.html