CAJ | 학술논문

由于石墨烯具有高电子迁移率的特性，可以用来制备高频电子器件。利用传输矩阵方法，对石墨烯 p-n 结及方形势垒纳米结构中的负微分电阻效应进行了研究。证实了石墨烯 p-n 结中负微分电阻现象比传统半导体中的幅度要小，石墨烯中 Klein 隧穿过程的存在使负能量范围内的空穴对电流产生影响。石墨烯纳米方形势垒中发生负微分电阻效应的位置在费米面附近，势垒宽度越大，对载流子的阻挡越大，负微分电阻效应越明显。
유우석묵희구유고전자천이솔적특성，가이용래제비고빈전자기건。이용전수구진방법，대석묵희 p-n 결급방형세루납미결구중적부미분전조효응진행료연구。증실료석묵희 p-n 결중부미분전조현상비전통반도체중적폭도요소，석묵희중 Klein 수천과정적존재사부능량범위내적공혈대전유산생영향。석묵희납미방형세루중발생부미분전조효응적위치재비미면부근，세루관도월대，대재류자적조당월대，부미분전조효응월명현。
The negative differential resistance (NDR)effect of graphene in the p-n junctions and nanoscale barriers is investigated by using transfer-matrix method.The NDR phenomenon in the graphene p-n junctions is not so obvious as that in the conventional semiconductors, because the holes in the negative energy range also contribute to the current due to the Klein tunneling.The NDR location of graphene nanoscale barriers lies on the Fermi energy level. The block of the barrier to the current is more apparent with increasing barrier width,and the NDR effect becomes more obvious.