Ag-BaO薄膜内场助光电发射增强现象研究

PHOTOEMISSION ENHANCEMENT OF Ag-BaO THIN FILMS WITH INTERNAL FIELD-ASSISTED STRUCTURE

通过在Ag BaO薄膜表面真空沉积 10nm厚的银电极 ,成功制备了内场助结构Ag BaO光电阴极 .测试结果显示 ,Ag BaO薄膜光电发射电流随内场助偏压的增大而上升 .理论分析表明 ,Ag BaO薄膜内场助光电发射增强现象产生的机理在于内场助作用下Ag微粒和BaO介质间等效界面位垒的减小及薄膜表面真空能级的相对下降 .

The Ag\|BaO photocathode with internal field\|assisted structure was successfully fabricated through depositing silver electrode on the surface of Ag\|BaO thin film. Photoemission enhancement was observed when the internal field\|assisted bias was applied to the Ag\|BaO thin film. Theoretical analysis shows that enhanced photoemission can be attributed to the decrease of interfacial barrier between Ag particles and BaO matrix, and the degradation of vacuum level at the surface.