Abstract
Anisotropy of the valence band is experimentally demonstrated in CuInSe2, a key component of
the absorber layer in one of the leading thin-film solar cell technology. By changing the orientation
of applied magnetic fields with respect to the crystal lattice, we measure considerable differences
in the diamagnetic shifts and effective g-factors for the A and B free excitons. The resulting free
exciton reduced masses are combined with a perturbation model for non-degenerate independent
excitons and theoretical dielectric constants to provide the anisotropic effective hole masses,
revealing anisotropies of 5.5 (4.2) for the A (B) valence bands.
the absorber layer in one of the leading thin-film solar cell technology. By changing the orientation
of applied magnetic fields with respect to the crystal lattice, we measure considerable differences
in the diamagnetic shifts and effective g-factors for the A and B free excitons. The resulting free
exciton reduced masses are combined with a perturbation model for non-degenerate independent
excitons and theoretical dielectric constants to provide the anisotropic effective hole masses,
revealing anisotropies of 5.5 (4.2) for the A (B) valence bands.
| Original language | English |
|---|---|
| Article number | 262101 |
| Number of pages | 4 |
| Journal | Applied Physics Letters |
| Volume | 101 |
| DOIs | |
| Publication status | Published - 26 Dec 2012 |
Keywords
- anisotropy
- CuInSe2
- effective masses
- valence band
- thin-film solar cell technology
- applied magnetic fields
- crystal lattice