Bibliographic Details
| Title: |
Evaluation of the two-photon absorption characteristics of GaSb/GaAs quantum rings. |
| Authors: |
Wagener, M. C., Carrington, P. J., Botha, J. R., Krier, A. |
| Superior Title: |
Journal of Applied Physics; 2014, Vol. 116 Issue 4, p044304-1-044304-6, 6p |
| Subject Terms: |
TWO-photon absorbing materials, PHOTONS, GALLIUM arsenide, BAND gaps, PHOTOEMISSION, QUANTUM rings |
| Abstract: |
The optical parameters describing the sub-bandgap response of GaSb/GaAs quantum rings solar cells have been obtained from photocurrent measurements using a modulated pseudomonochromatic light source in combination with a second, continuous photo-filling source. By controlling the charge state of the quantum rings, the photoemission cross-sections describing the two-photon sub-bandgap transitions could be determined independently. Temperature dependent photo-response measurements also revealed that the barrier for thermal hole emission from the quantum rings is significantly below the quantum ring localisation energy. The temperature dependence of the sub-bandgap photo-response of the solar cell is also described in terms of the photo- and thermal-emission characteristics of the quantum rings. [ABSTRACT FROM AUTHOR] |
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| Database: |
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