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Co-diffused back-contact back-junction silicon solar cells

: Keding, Roman

Fulltext urn:nbn:de:0011-n-3601754 (2.3 MByte PDF)
MD5 Fingerprint: 1321ffb067aa7f6f116048295938b984
Created on: 13.11.2015


Stuttgart: Fraunhofer Verlag, 2015, 204 pp.
Zugl.: Freiburg, Univ., Diss., 2015
Solar Energy and Systems Research
ISBN: 3-8396-0905-4
ISBN: 978-3-8396-0905-7
Dissertation, Electronic Publication
Fraunhofer ISE ()
solar energy; solar cell efficiency

The driving force in photovoltaics is the reduction of the ratio between device costs and conversion efficiency. The present research study introduces a highly innovative diffusion process, called co-diffusion, which allows for a drastic decrease in process costs, on the one hand, and the assembly of a highly efficient solar cell device, the back-contact back-junction (BC-BJ) silicon solar cell, on the other. The co-diffusion approach is based on pre-patterned layers, which contain dopants, deposited by means of plasma enhanced chemical vapor deposition and diffusion in a tube furnace, which contains dopant gases in the process atmosphere. The solar cells are built on n-type silicon which features a high potential in achieving a high silicon life time, which is a necessary requirement of highly efficient BC-BJ solar cells. Fundamental knowledge in terms of co-diffusion processes can be gained from this research study. The processes allow for the fabrication of BC-BJ solar cell devices with a conversion efficiency exceeding 21 percent.