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Analysis of local Al-P+-layers for solar cells processed by small screen-printed structures

: Krause, J.; Woehl, R.; Biro, D.

Volltext urn:nbn:de:0011-n-1564397 (546 KByte PDF)
MD5 Fingerprint: 21a0bf7fc8af668095c984894c6a5dec
Erstellt am: 3.8.2012

European Commission:
25th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2010. Proceedings : 5th World Conference on Photovoltaic Energy Conversion, 6-10 , September 2010, Valencia, Spain
München: WIP-Renewable Energies, 2010
ISBN: 3-936338-26-4
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <25, 2010, Valencia>
World Conference on Photovoltaic Energy Conversion <5, 2010, Valencia>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
PV Produktionstechnologie und Qualitätssicherung; Silicium-Photovoltaik; Herstellung und Analyse von hocheffizienten Solarzellen; Pilotherstellung von industrienahen Solarzellen; Industrielle und neuartige Solarzellenstrukturen

In this work the formation of local p+-layers processed by small screen-printed Al-structures is investigated in comparison to a full area metallization. For a better understanding of the alloying process in an industrial belt furnace investigations on full area samples were performed varying the Al-paste amount and firing conditions. The samples were characterized by sheet resistance measurements for a fast determination of thickness and doping of the Al-p+-layers. For deeper analyses scanning electron microscope (SEM) pictures of some samples were taken in order to analyse homogeneity and thickness of different layers. The results of these analyses are compared to a simple model of the alloying process. So some major effects limiting the formation of thick p+-layers e.g. for high paste amounts could be determined. For small screen-printed structures a homogenous and very thick p+-layer could be observed. Surprisingly small printed structures result in a thicker p+-layer then corresponding fully metalized areas even if processed on the same wafer. The reason for this effect is probably the higher energy input from areas between printed fingers.