正对电极结构型碳化硅光导开关的制备与性能研究  

Preparation and Properties of Lateral Contact Structure SiC Photoconductive Semiconductor Switches

作　　者：常少辉[1,2] 刘学超[1] 黄维[1] 周天宇[1,2] 杨建华[1] 施尔畏[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]中国科学院研究生院,北京100049

出　　处：《无机材料学报》2012年第10期1058-1062,共5页Journal of Inorganic Materials

基　　金：中国科学院知识创新工程重要方向项目(KJCX2-EW-W10)~~

摘　　要：采用钒掺杂半绝缘6H-SiC衬底,以Ni/Au为接触电极制备了一系列正对电极结构型光导开关,对SiC光导开关进行了不同外加电压、激发光强、激发光波长条件下的测试,着重研究了SiC光导开关的光电吸收效应和光电响应性能.实验结果表明,532 nm的激光激发的脉冲信号宽度远小于1064 nm的激光激发的脉冲信号宽度,半绝缘6H-SiC衬底对532 nm激光的吸收系数在0.601～0.692 mm–1之间;采用532 nm的激光激发光导开关,获得了纳秒量级的响应信号;流经开关的瞬态电流随着外加电压和激发光能量的增加而增大,随着衬底厚度的增加而减小.A series of lateral structural photoconductive semiconductor switches（PCSS） were fabricated on V-doped semi-insulating 6H-SiC substrate with the Ni/Au contacts.These PCSS were measured with different bias voltages, excitation energies and excitation wavelengths.The photoelectric absorption effect and photoelectric response of SiC PCSS were investigated.It is found that the absorption coefficient is between 0.601 and 0.692 mm–1 for semi-insulating 6H-SiC substrate when it is excited by 532 nm laser,and the corresponding pulse signal is much smaller than that excited by 1064 nm laser.Nanosecond-pulse signal is obtained for 6H-SiC PCSS excited by 532 nm laser.The peak current flowing through the switch is increased with increasing the bias voltage and excitation energy, while it is decreased with the increase in substrate thickness.

关 键 词：光导开关 钒掺杂6H-SiC 正对电极结构 

分 类 号：TN36[电子电信—物理电子学]