Persistent photocurrents in CVD diamond
作者： C.E. Nebel , A. Waltenspiel , M. Stutzmann , M. Paul , L. Schäfer
DOI: 10.1016/S0925-9635(99)00204-6
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摘要: Abstract Persistent photocurrents (PPCs) in undoped polycrystalline CVD diamond are generated by UV illumination with 5.5 eV photons. PPCs several orders of magnitude larger than dark currents and can be annealed at T>550 K. The PPC annealing dynamic is stretched exponentially an activation energy 1.4 eV. Thermally stimulated (TSCs) dominated maxima around 550 K which related to a trap level 1.4 eV deep the gap diamond. generates photocurrent response onset hν≥0.6 eV measured spectrally resolved photocurrents. A model discussed accounts for detected phenomena where electrons captured grain boundaries holes defects grains
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