- Startseite
- Mitarbeitende
- Andrae
- Publikationen
- Multicrystalline silicon thin film solar cells based on vanadium oxide heterojunction and laser doped contacts
Multicrystalline silicon thin film solar cells based on vanadium oxide heterojunction and laser doped contacts
in: Physica Status Solidi A-Applications and Materials Science (2019)
Liquid phase crystallized (LPC) silicon thin films on glass substrates are a feasible alternative to conventional crystalline silicon (c-Si) wafers for solar cells. Due to substrate limitation, a low temperature technology is needed for solar cell fabrication. While silicon heterojunction is typically used, in this work the combination of vanadium oxide/c-Si heterojunction as emitter and base contacts defined by IR laser processing of phosphorus-doped amorphous silicon carbide stacks is explored. LPC solar cells are fabricated using such technologies in order to identify their issues and advantages with a promising performance of an active-area efficiency of 5.6%. Apart from the absence of light trapping techniques, the relatively low efficiency obtained is attributed to a low lifetime in the LPC silicon bulk. These poor material properties imply a short diffusion length that makes that only photogenerated carriers in the emitter regions could be collected. Consequently, future devices should show narrower base contact regions, suggesting a shorter-wavelength laser, combined with longer LPC substrate lifetimes.