Field emission property of ZnO nanowires prepared by ultrasonic spray pyrolysis

Abstract

The field emission property of cold cathode emitters utilizing the ZnO nanowires with various conditions prepared by ultrasonic spray pyrolysis technique was discussed. It is found that the emission current was enhanced in the emitters having higher aspect ratio as well as smaller sheet resistance. Applying of post-annealing process, utilization of additional Mo back electrode in the cathode, and coating of Mo on the ZnO nanowires resulted in the improvement of the emission current and lowering the threshold voltage. A threshold voltage of about 5.5 V/µm to obtain 1.0 µA/cm 2 was achieved in the sample prepared at the growth temperatures varying continuously from 250• C to 300• C.

Electron Emission Devices for Energy‐Efficient Systems

“…In the last couple of decades, large number of new materials and composites have been studied to reveal their field emission performance including different metals, semiconductors, metal oxides, sulfides, carbides, nitrides, ferrites, perovskite solids, hexaborides, and so on. Apart from these materials, low‐dimensional materials are getting significant attention recently.…”

Elaboration of ZnO nanowires by solution based method, characterization and solar cell applications

“…Many synthetic methodologies have been employed to achieve ZnO nanowires, including ball-milling [12] , chemical bath deposition [13,14] , physical vapor deposition (PVD) [5] , hydrothermal process or two step method [15][16][17] , electrochemical deposition [18] , sonochemical [19] , pulsed-laser deposition [20] , vapor phase deposition [21] , radio frequency magnetron sputtering [22] , sol-gel [23] , spray pyrolysis [24] , microwave irradiation [25] and chemical vapor deposition [26,27] . ZnO nanostructures such as nanowires have been extensively studied for many applications including photo-detectors [28,29] , solar cells [30][31][32][33][34][35][36][37][38] , sensors [39][40] light-emitting diodes [41] and photo catalysis [42][43][44] .…”