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以不同波长的光分别照射半导体时,虽然各入射光的能量都相等,但所能产生的光电导却因波长而异。也就是说,以光电导对波长所作的图线——即光电导光谱分布——并不是一条与波长轴相平行的直线,而是一条有一定形状的曲线。事实上,半导体的光电导光谱分布一般都有一个峰值,位于该半导体的本征吸收带的长波限附近;光电导自峰值向长波方面迅速下降,向短波方面也有某种程度的下降。
When irradiating semiconductors with different wavelengths of light respectively, the photoconductivity that can be generated varies depending on the wavelength although the energy of each incident light is equal. That is, the plot of photoconductivity versus wavelength - that is, the photoconductive spectral distribution - is not a straight line parallel to the wavelength axis but a curved shape. In fact, the photoconducting optical spectrum of a semiconductor generally has a peak in the vicinity of the long wavelength limit of the intrinsic absorption band of the semiconductor; the photoconductivity decreases rapidly from the peak to the long wavelength and decreases to the short wavelength to some extent.