Optimizing the geometry of local aluminum-alloyed contacts to fully screen-printed silicon solar cells

Author

Müller, Jens ; Gatz, Sebastian ; Bothe, Karsten ; Brendel, Rolf

Author_Institution

Inst. for Solar Energy Res. Hamelin (ISFH), Emmerthal, Germany

fYear

2012

fDate

3-8 June 2012

Abstract

The performance optimization of solar cells comprising a locally contacted rear surface is a trade-off between rear surface recombination losses and resistive losses. Considering local aluminum (Al)-alloyed contacts formed by screen-printing an additional challenge arises from the impact of the processing conditions on the contact properties. The aim of this work is the development of a guideline to find the optimum contact geometry based on analytical models and experimentally verified parameterizations. Our study reveals equal performance of point and line rear contact layouts and an optimum metallization fraction of around 20 % on 2 Ωcm p-type Czochralski grown (Cz) Si.

Keywords

aluminium; crystal growth from melt; metallisation; silicon; solar cells; surface recombination; line rear contact layouts; local aluminum alloyed contacts; metallization fraction; p-type Czochralski growth; performance optimization; point rear contact layouts; rear surface recombination losses; resistive losses; screen printed silicon solar cells; Analytical models; Current density; Metallization; Photovoltaic cells; Reflectivity; Resistance; Silicon; analytical model; local Al alloyed contacts; screen printing; silicon solar cells;

fLanguage

English

Publisher

ieee

Conference_Titel

Photovoltaic Specialists Conference (PVSC), 2012 38th IEEE

Conference_Location

Austin, TX

ISSN

0160-8371

Print_ISBN

978-1-4673-0064-3

Type

conf

DOI

10.1109/PVSC.2012.6318038

Filename

6318038