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Photocurrent spectrum (PC) is reported both at room temperature and at 77 K on p-i-n Zn1-xCdxSe/ZnSe multiple quantum well heterostructures (x approximately equals 0.12) grown by molecular beam epitaxy. Almost all the exciton transitions, allowed and forbidden, associated with the two lowest electron and three highest hole subbands are clearly observed. With the increase of well width from 22 angstrom to 54 angstrom, an evolution of excitonic structure in PC spectra is demonstrated. Theoretical calculations show a quite good agreement with the measurement results, and from the comparison between theory and experiment, an exiton binding energy for heavy hole of 28 meV, and for light hole of 20 meV are obtained for this type of quantum wells.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only. |
