Abstract
Back contacts for Si solar cells made by Al evaporation and screen printing Al paste were studied by transmission electron microscopy. Si was found to diffuse into the Al during heating. Si diffusion formed vacancies in the Si wafer and Al could then penetrate the Si wafer in spiked formations. The Al spikes retracted during cooling, leaving a doped back surface field region.
Original language | English |
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Pages (from-to) | 863-869 |
Number of pages | 7 |
Journal | Progress in Photovoltaics: Research and Applications |
Volume | 22 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2014 Jan 1 |
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Electrical and Electronic Engineering
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics