Characterization of temporal response, spectral responsivity and its spatial uniformity in photoconductive diamond detectors |
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| Authors: | T Saito K Hayashi H Ishihara I Saito |
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| Affiliation: | aElectromagnetic Waves Division, National Institute of Metrology of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1, Umezono, Tsukuba, Ibaraki 305-8563, Japan;bElectronics Research Laboratory, Kobe Steel, Ltd. 1-5-5, Takatsukadai, Nishi-ku, Kobe 651-2271, Japan;cTechnical R and D Center, Iwasaki Electric Co., Ltd. 1-20, Fujimicho, Gyoda, Saitama 361-0021, Japan |
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| Abstract: | Three photoconductive diamond detectors with highly oriented diamond (HOD) films fabricated by the same process were characterized with respect to temporal response, spectral responsivity and its spatial uniformity over the wavelength range from 190 to 250 nm. Temporal measurements showed a drift in the baseline, suggesting the presence of deep level carrier traps. The responsivity of specimen No. 2 was more than twice those of the other two specimens, but it showed an unpredictable current fluctuation. It was found that the spatial uniformities of all the specimens were too low for radiometric purposes. A prominent peak, thought to be due to photoemission, was found in the responsivity spatial distribution of specimen No. 3 under a negative applied voltage. |
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| Keywords: | Photoconductive diamond detector Spectral responsivity Spatial uniformity Temporal response Photoemission |
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