Boron Doped diamond films as electron donors in photovoltaics: An X-ray absorption and hard X-ray photoemission study
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- Department of Physics, University of California, Davis, California 95616 (United States)
- Ångström Solar Center, Uppsala University, Box 534, SE-751 21 Uppsala (Sweden)
- Department of Physics, University of California, Berkeley, California 94720 (United States)
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
- Department of Chemistry, University of Wisconsin Madison, Madison, Wisconsin 53706 (United States)
Highly boron-doped diamond films are investigated for their potential as transparent electron donors in solar cells. Specifically, the valence band offset between a diamond film (as electron donor) and Cu(In,Ga)Se₂ (CIGS) as light absorber is determined by a combination of soft X-ray absorption spectroscopy and hard X-ray photoelectron spectroscopy, which is more depth-penetrating than standard soft X-ray photoelectron spectroscopy. In addition, a theoretical analysis of the valence band is performed, based on GW quasiparticle band calculations. The valence band offset is found to be small: VBO=VBM{sub CIGS} – VBM{sub diamond}=0.3 eV±0.1 eV at the CIGS/Diamond interface and 0.0 eV±0.1 eV from CIGS to bulk diamond. These results provide a promising starting point for optimizing the band offset by choosing absorber materials with a slightly lower valence band maximum.
- OSTI ID:
- 22305789
- Journal Information:
- Journal of Applied Physics, Vol. 116, Issue 14; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
BINDING ENERGY
BORON ADDITIONS
COMPUTERIZED SIMULATION
DIAMONDS
DOPED MATERIALS
ELECTRONS
FILMS
HARD X RADIATION
INTERFACES
PHOTOELECTRON SPECTROSCOPY
PHOTOEMISSION
PHOTOVOLTAIC EFFECT
SOFT X RADIATION
SOLAR CELLS