【摘要】 采用热丝化学气相沉积(HFCVD)法制备了1.8μm、2.5μm和3.1μm三种晶粒尺寸的金刚石薄膜,并制作了共平面光电导探测器。采用光学显微镜和拉曼光谱仪研究了薄膜的结构和表面形貌。电流—电压(I-V)特性测试结果表明,探测器性能与金刚石薄膜晶粒大小密切相关,随着晶粒尺寸的增加,光电流/暗电流之比以及净光电流均提高。更多还原

【Abstract】 Diamond films with different grain sizes from 1.8 μm to 3.1 μm were prepared using the bias-enhanced hot filament chemical vapor deposition(HFCVD)technique.The film structure and morphology were characterized using the optic microscope and Raman spectrometer.I-V measurement results showed that the performance of the detector was related to the grain size of the diamond film.With increasing the grain size,the photocurrent,the ratio of photocurrent to dark current and the net photocurrent all increased.The above results indicate that diamond films with larger grain size are more suitable for being fabricated as semiconductor detectors.更多还原