Kaawash, Nabeel M. S.Kejriwal, NubbhHalge, Devidas I.Narwade, Vijaykiran N....
7页查看更多>>摘要：The photo detection characteristics of spray pyrolysis deposited ZnO thin film on glass substrate at 250 OC was demonstrated for fabrication of highly stable visible-blind UV photodetector. This photodetector exhibits lower dark current < 0.04 mu A, higher UV photosensitivity-4750, responsivity of 0.14 A/W and detectivity of 1.24 x 10(12 )Jones at an average intensity of 140 mu W/cm(2) of 340 nm. This Ag/ZnO/Ag device show excellent photo response (rise and decay) time of-4 and 6 ms with external quantum efficiency of 51%. The observed photo-current in the device is associated with adsorption and light-induced desorption of oxygen from the defect sites on the film surfaces. The adsorbed oxygen removes the electron trap centers and increasing the free carrier density in ZnO.
原文链接:
NSTL
Elsevier
Rao, Mo-QinDai, Chang-JieLi, Jian-HuaChen, Pei...
7页查看更多>>摘要：Different from hexagon-based carbon structures, the recently synthesized cyclopropyllithium derivative molecule of [{mu c-CSiMe3C2H4}Li](4) possesses both triangular and quadrilateral rings, which is expected to exhibit interesting electronic features. Based on first-principles calculations, the electronic transport of this molecule contacted with carbon linear chain electrodes is investigated. Large negative differential resistance (NDR) phenomenon is observed. Moreover, the NDR is found to be robust to the doping on side branches which are perpendicular to the transport direction, but sensitive to the doping on main branches, which has a great influence on the NDR. NDR is found in all the doping cases, suggesting it is the intrinsic feature of such systems. Further analysis shows that, it is the suppression of the transmission peak induced by the change of energy states from delocalization to localization around the Fermi level that triggers the NDR. Our findings may throw light on the development of future molecular devices.
原文链接:- NSTL
- Elsevier
