Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9586228 | Journal of Luminescence | 2005 | 4 Pages |
Abstract
Transient photocurrent of SrTiO3 induced by excitation in the fundamental absorption has been measured by the time-of-flight method at low temperatures. The drift mobilities of electrons and holes at 4Â K were evaluated to be 1.10Ã104 and 7.0Ã103Â mm2Â s-1Â V-1, respectively. The result indicates that the hole as well as the electron is highly mobile in SrTiO3 crystal and that the photo-generated carriers relax into large polarons. We have found that the drift mobilities of the carriers are retarded with increasing the electric field. The field dependence of the drift mobility may arise from the polarization induced by the carrier relaxation with the external electric field.
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Authors
Chihiro Itoh, Mitsuyoshi Sasabe, Hirotsugu Kida, Ken-ichi Kan'no,