Ultraviolet Intrinsic and Extrinsic Photoconductivity of Natural Diamond
Ultraviolet Intrinsic and Extrinsic Photoconductivity of Natural Diamond
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天然金刚石的紫外本征和外在光电导率
DOI：
10.1103/physrev.161.762
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发表时间：
1967
期刊：
影响因子：
--
通讯作者：
P. J. Dean
中科院分区：
文献类型：
--
作者：
P. Denham;E. C. Lightowlers;P. J. Dean
本文详细研究了几种天然金刚石在3.0 ~ 5.9eV光谱能量范围内的光电导响应。振荡结构的光电导超过基本吸收边在5.49 eV已被证明是密切相关的发光激发光谱中的类似的振荡结构，但不会出现在吸收光谱。振荡仅与N9吸收/发光系统一起出现，在5.25和5.26 eV处没有声子线，这最近被归因于与最近邻氮-铝供体-受体对（5 D A复合物）结合的间接激子的产生和衰减。光电导最小值和发光激发最大值归因于如果自由激子的剩余动能在通过光学声子的级联发射耗散其大部分多余能量后非常低，则创建束缚激子N9态的概率增强。在N9系统的非声子线区域中也观察到了光电导猝灭，并且发现这种效应的温度依赖性与5 D A复合物的一种拟议衰减模式一致。在所有绝缘金刚石中观察到的光电导阈值为4.05 eV，这被认为是隔离的取代氮供体的光电离极限。光霍尔效应的测量结果支持了这一解释。
A detailed investigation has been made of the photoconductivity response of several types of natural diamond in the spectral energy range from 3.0 to 5.9 eV. Oscillatory structure in the photoconductivity beyond the fundamental absorption edge at 5.49 eV has been shown to be closely related to similar oscillatory structure in the luminescence-excitation spectra, but does not appear in the absorption spectrum. The oscillations appear only together with the N9 absorption/luminescence system with no-phonon lines at 5.25 and 5.26 eV, which has recently been attributed to the creation and decay of indirect excitons bound to nearest-neighbor nitrogen-aluminum donor-acceptor pairs (5 D A complex). The photoconductivity minima and the luminescence-excitation maxima are attributed to the enhanced probability of the creation of bound-exciton N9 states if the residual kinetic energy of free excitons is very low after the dissipation of the majority of their excess energy through the cascade emission of optical phonons. Photoconductivity quenching has also been observed in the region of the no-phonon lines of the N9 system, and the temperature dependence of this effect has been found to be consistent with one of the proposed decay modes of the 5 D A complex. A photoconductivity threshold has been observed at 4.05 eV in all insulating diamonds, which is considered to be the photoionization limit for the isolated substitutional nitrogen donor. Photo-Hall-effect measurements have been made which support this explanation.