Biaxially-Textured Photovoltaic Film Crystal Silicon on Ion Beam Assisted Deposition CaF2 Seed Layers on Glass
We grow biaxially textured heteroepitaxial crystal silicon (c-Si) films on display glass as a low-cost photovoltaic material. We first fabricate textured CaF{sub 2} seed layers using ion-beam assisted deposition, then coat the CaF{sub 2} with a thin, evaporated epitaxial Ge buffer and finally deposit heteroepitaxial silicon on the Ge. The silicon is grown by hot-wire chemical vapor deposition, a high-rate, scalable epitaxy technology. Electron and X-ray diffraction confirm the biaxial texture of the CaF{sub 2} and epitaxial growth of the subsequent layers. Transmission electron microscopy reveals columnar silicon grains about 500 nm across. We fabricate a proof-of-concept epitaxial film c-Si solar cell with an open circuit voltage of 375 mV that is limited by minority carrier lifetime.
- Research Organization:
- National Renewable Energy Lab. (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
- DOE Contract Number:
- AC36-08GO28308
- OSTI ID:
- 1048589
- Report Number(s):
- NREL/JA-5200-55506; TRN: US201216%%1022
- Journal Information:
- Energy & Environmental Science, Vol. 5, Issue 5; ISSN 1754-5692
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
BUFFERS
CARRIER LIFETIME
CHEMICAL VAPOR DEPOSITION
DEPOSITION
ELECTRIC POTENTIAL
ELECTRONS
EPITAXY
GLASS
ION BEAMS
SEEDS
SILICON
SOLAR CELLS
TEXTURE
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION
solar energy
crystal silicon
photovoltaic material
film crystal silicon