【摘要】 测量了夹在两个金属电极间的非故意掺杂的n型立方氮化硼(cBN)晶体的伏安特性,它们为非线性曲线.使用不同的电极测量了20多个cBN晶体的伏安特性,曲线的形状非常相似.在样品两端的电压值大约为560V时,cBN晶体发生电致发光现象.利用空间电荷限制电流和能谷间的电子跃迁解释了上述实验现象.更多还原

【Abstract】 The current-voltage(I-V) characteristics of cBN crystal sandwiched between two metallic electrodes are measured and found to be nonlinear.Over 20 samples are measured at room temperature with various electrodes,and the resulting curves are all similar in shape.When a voltage of about 560V is applied to the cBN crystal,the emitted light is visible to the naked eye in a dark room.We explain these phenomena by the space charge limited current and the electronic transition between the X and Γ valleys of the conduction band.更多还原