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, an...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 Г valleys of the conduction band.展开更多
The electric properties of nonintentionally doped n-cubic boron nitride(cBN)crystal are investigated.The cBN crystal was transformed from hexagonal-boron nitride(h-BN)under high pressure(HP)and high temperature(HT)usi...The electric properties of nonintentionally doped n-cubic boron nitride(cBN)crystal are investigated.The cBN crystal was transformed from hexagonal-boron nitride(h-BN)under high pressure(HP)and high temperature(HT)using magnesium powder as catalyst.At room temperature,the current-voltage(I-V)characteristics of cBN crystal are measured and found to be nonlinear.When the electric field is in the range of(1―1.5)×105 V/cm,the avalanche breakdown occurs inside the whole cBN crystal.At this same time,the bright blue-violet with the wavelength of 380―400 nm from the cBN crystal is observed.When measuring the I-V curve after breakdown of cBN crystal,the current-controlled differential negative resistance phenomenon is observed.The breakdown is repeatable.展开更多
文摘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 Г valleys of the conduction band.
基金the Research Foundation of Zhuhai College of Jinan University for recruited excellent talents(Grant No.510062)
文摘The electric properties of nonintentionally doped n-cubic boron nitride(cBN)crystal are investigated.The cBN crystal was transformed from hexagonal-boron nitride(h-BN)under high pressure(HP)and high temperature(HT)using magnesium powder as catalyst.At room temperature,the current-voltage(I-V)characteristics of cBN crystal are measured and found to be nonlinear.When the electric field is in the range of(1―1.5)×105 V/cm,the avalanche breakdown occurs inside the whole cBN crystal.At this same time,the bright blue-violet with the wavelength of 380―400 nm from the cBN crystal is observed.When measuring the I-V curve after breakdown of cBN crystal,the current-controlled differential negative resistance phenomenon is observed.The breakdown is repeatable.
