Reevaluation of bandgap and free exciton binding energy of GaP |
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Authors: | B Monemar L Samuelson |
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Institution: | Lund Institute of Technology, Department of Solid State Physics, Box 725, S-220 07 Lund 7, Sweden |
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Abstract: | Very sensitive measurements on the spectral behaviour of the free-to-bound excitation σpl°(hν) from the valence band to the deep 0 donor in GaP at low temperatures are presented. Evaluation of the threshold energy for the electronic transition, together with the known value of the 0 binding energy, provides a simple and accurate way to determine the indirect bandgap Eg of GaP. Our new value is Eg = 2.3525 ± 0.003 eV at 1.5 K, which gives an exciton binding energy Ex = 24 ± 3 meV, considerably larger than previously used values. These data also imply an upward revision of acceptor binding energies in GaP with 10 ± 2 meV. |
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