Browsing by Author "Lin, Yow-Jon"

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Effects of ultraviolet treatment on the contact resistivity and electronic transport at the Ti/ZnO interfaces
(2009-07-01)
Lin, Yow-Jon
;
Tsai, Chia-Lung
;
Liu, W. -R.
;
Hsieh, W. F.
;
Hsu, C. -H.
We report on the effect of ultraviolet (UV) treatment on the specific contact resistance (rho) and electronic transport at the Ti/ZnO interfaces. The experimental results show the same barrier height of Ti/ZnO samples without UV treatment as Ti/ZnO samples with UV treatment and the higher rho of Ti/ZnO samples with UV treatment than Ti/ZnO samples without UV treatment, suggesting the barrier-height independence of rho. Based on the thermionic-emission model and x-ray photoelectron spectroscopy results, we found that the induced decrease in the number of the hydroxides at the surface region of ZnO by UV treatment resulted in decreases in the electron concentration near the surface region and the excess current component related to tunneling, increasing in rho of Ti/ZnO samples.
Hall-effect mobility of pentacene films prepared by the thermal evaporating method with different substrate temperature
(1970-01-01)
Lin, Yow-Jon
;
Tsao, Hou-Yen
;
Liu, Day-Shan
;
光電工程學系
;
Department of Photonics
We studied the Hall-effect mobility of pentacene films prepared by the thermal evaporating method with different substrate temperature. A crossover from coherent bandlike charge transport with mobilities up to several tens of cm(2)/V-s at low temperature to an incoherent hopping motion at high temperature is observed. The carrier mobilities of pentacene exhibit a hopping-to-band transition around room temperature. An exhibition of high mobility of pentacene films prepared with substrate temperature of 90 degrees C is attributed to the increased spacing between molecules. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4733293]