American Institute of Physics, Applied Physics Letters, 14(105), p. 142103, 2014
DOI: 10.1063/1.4897995
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The electronic structure of the solar cell absorber CuInSe2 is studied using magneto-transmission in thin polycrystalline films at magnetic fields up to 29 T. A, B, and C free excitons are resolved in absorption spectra at zero field and a Landau level fan generated by diamagnetic exciton recombination is observed for fields above 7 T. The dependence of the C band exciton binding energy on magnetic fields, calculated using a hydrogenic approximation, is used to determine the C exciton Rydberg at 0 T (8.5 meV), band gap (1.2828 eV), and hole effective mass m(so) = (0.31 +/- 0.12)m(0) for the C valence sub-band. (C) 2014 AIP Publishing LLC.