Photo-enhanced field electron emission of cadmium sulfide nanowires  

作　　者：ZHANG JinLing LV YingHua LIU Ning LI YanQing GAO Peng BAI XueDong 

机构地区：[1]School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China [2]Functional Nano ＆ Soft Materials Laboratory （FUNSOM）, Soochow University, Suzhou 215123, China [3]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2011年第11期1963-1966,共4页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 60771060,61072136 and 60871081)

摘　　要：The response of field electron emission of cadmium sulfide (CdS) nanowires (NWs) to visible light has been investigated.It is found that,upon light illumination,the turn-on voltage drops,emission current increases obviously,and the Fowler-Nordheim behavior deviates from a straight line.A process of field emission coupled with semiconducting properties of CdS NWs is proposed.Photon-excited electron transition from the valence band to the conductance band of CdS nanowires increases the quantity of emitting electrons,and the photoemission decreases the effective work function of CdS emitters,which largely enhances the field emission performance.The response of field emission of CdS NWs to light illumination suggests an approach for tuning field emission of semiconductor emitters.The response of field electron emission of cadmium sulfide （CdS） nanowires （NWs） to visible light has been investigated. It is found that, upon light illumination, the turn-on voltage drops, emission current increases obviously, and the Fowler-Nordheim behavior deviates from a straight line. A process of field emission coupled with semiconducting properties of CdS NWs is proposed. Photon-excited electron transition from the valence band to the conductance band of CdS nanowires increases the quantity of emitting electrons, and the photoemission decreases the effective work function of CdS emitters, which largely enhances the field emission performance. The response of field emission of CdS NWs to light illumination suggests an approach for tuning field emission of semiconductor emitters.

关 键 词：field electron emission optical coupling CdS nanowires semiconductor emitters 

分 类 号：TN304.055[电子电信—物理电子学] TB383[一般工业技术—材料科学与工程]