Photocarrier transport in iron-doped potassium lithium tantalate niobate studied by time-of-flight measurement
✍ Scribed by Zhongxiang Zhou; Yang Li; Hao Tian; Jun Li; Yuqiang Liu; Yanqiang Yang
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 331 KB
- Volume
- 282
- Category
- Article
- ISSN
- 0030-4018
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✦ Synopsis
The photocarrier mobility of Fe 0.03 wt%-doped potassium lithium tantalate niobate (K 0.95 Li 0.05 Ta 0.61 Nb 0.39 O 3 ) was investigated by time-of-flight (TOF) measurement. The longitudinal photocarrier response due to pulsed excitation leads to values of the drift mobility of l h = 1.45 Â 10 À2 cm 2 /V s for holes, l e = 0.325 Â 10 À2 cm 2 /V s for electrons, and a value for the range of holes (ls) h = 4.38 Â 10 À5 cm 2 /V at room temperature and at low field 3 KV/cm. The response time of holes and electrons (or the relaxation time) is determined to be 3.02 Â 10 À3 s and 3.74 Â 10 À3 s, respectively. The mobility of holes strongly depends on the field strength, and is observed to decrease with increasing bias field.