The effect of annealing on the X‐ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

Abdel‐Rahman, Mohamed A.E.; Lohstroh, A.; Sellin, P.J.

doi:10.1002/pssa.201100011

Cited by 21 publications

(13 citation statements)

References 38 publications

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“…However, it should be kept in consideration that the Fowler model assumes that Δ is determined only by the bulk properties of the material. In this case Δ could be also affected by the electrode interface [17]. Increasing the applied bias to +25 V it was found Δ = 0.86.…”

Section: Resultsmentioning

confidence: 86%

X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

et al. 2013

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Diamond has unique properties which make it suitable for a broad range of radiation detection applications ranging from particle timing and spectroscopy, to neutron, UV and X-ray sensors. In X-ray dosimetry, the atomic number of diamond (Z = 6) close to that of the human tissues (Z = 7.42) allows to mimic the real absorbed dose avoiding off-line recalculations. Moreover, its low atomic number and the capability to withstand high radiation fluxes make possible its use as beam monitor without altering significantly the properties of the interacting beam. To preserve the tissue equivalence of the diamond and minimize the perturbation and absorption of the incident beam, diamond detectors based on low thickness and low atomic number electrodes become a requirement. In this paper we present the X-ray detection characteristics of electronic grade CVD diamond sensors prepared in house with thin amorphous carbon electrodes fabricated by Pulsed Laser Deposition (PLD) technique in the fluence range of 2.3 -3.6 J•cm -2 . The devices showed a linear dependence of the induced photocurrent respect to the dose rate. Also, best dynamic response and better stability of the signals were achieved for applied bias up to ±50 V with signal to noise ratio (SNR) of ~300.

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Section: Resultsmentioning

confidence: 86%

X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

et al. 2013

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“…For radiation detection, the diamond device can be designed in a photoconductive [23,54] or a photodiode structure [55,56]. The basic principle for using diamond in a particle detector design is illustrated in Fig.…”

Section: Diamond Radiation Detectorsmentioning

confidence: 99%

Properties of Diamonds and Their Application in Photodetectors

Yuan

Lin

Chee

2020

Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications

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Diamond is not an unfamiliar material for most people as it is being widely used in jewelry over the past several centuries. Besides being metastable and having a shiny appearance, diamond has the highest mineral hardness and thermal conductivity among natural materials while posessesing extraordinary properties among ultra-wide bandgap semiconductors. Compared with traditional semiconductors, such as Si, GaAs, SiC, and so on, diamond has superior carrier mobility, good optical transparency, and high radiation hardness. As a result, radiation detector applications in high-energy physics experiments began to exploit natural diamond materials from as early as in the middle of the last century. However, the highly variable and uncontrollable defect content and concentration of impurities in natural diamonds constrain the advanced and reliable application of diamond electronic devices. In recent years, the development of diamond synthesis techniques via chemical vapor deposition (CVD) has led to investigations into diamond electronic applications, as large-area (centimeter scale) production of single-crystal diamond can be realized, and the impurity concentration can be controlled. Diamond radiation detectors therefore represent one of the research projects that underwent some decades of investigation and are still being under study. In this chapter, we summarize the detection mechanisms in two different types of diamond detectors: 1) diamond photoconductors and 2) Schottky barrier photodiodes, which depend strongly on the contact properties between the electrode materials and diamond surface. Meanwhile, the main features of diamond detectors, like responsivity, quantum efficiency, charge collection efficiency, charge collection distance, and others, are introduced and discussed. The remarkable properties of diamond promise several opportunities in a diverse range of application fields, whereas the daunting technical challenges, such as relating to size, doping, and manufacturing scalability, are still in the way of high technology commercialization, especially in electronics. Nevertheless, with new developments in materials synthesis, and research and practical applications, the outlook for diamond is exciting.

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“…Leakage current changes under a bias voltage, and the photo-current under UV irradiation, were measured for various film thicknesses due to different thin-film Ag electrode deposition times. We also analyzed the surface and current characteristics of the deposited thin-film Ag electrode to achieve a highly efficient and sensitive CVD diamond radiation detector [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Thin-Film Ag Electrode Deposition Thickness on the Current Characteristics of a CVD Diamond Radiation Detector

2018

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Background:We investigated the current characteristics of a thin-film Ag electrode on a chemical vapor deposition (CVD) diamond. The CVD diamond is widely recognized as a radiation detection material because of its high tolerance against high radiation, stable response to various dose rates, and good sensitivity. Additionally, thin-film Ag has been widely used as an electrode with high electrical conductivity. Materials and Methods:Considering these properties, the thin-film Ag electrode was deposited onto CVD diamonds with varied deposition thicknesses (≒50/98/152/257 nm); subsequently, the surface thickness, surface roughness, leakage current, and photo-current were characterized. Results and Discussion:The leakage current was found to be very low, and the photo-current output signal was observed as stable for a deposited film thickness of 98 nm; at this thickness, a uniform and constant surface roughness of the deposited thin-film Ag electrode were obtained. Conclusion:We found that a CVD diamond radiation detector with a thin-film Ag electrode deposition thickness close to 100 nm exhibited minimal leakage current and yielded a highly stable output signal. JRPRScience and ICT (MSIT) of Republic of Korea.

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The effect of annealing on the X‐ray induced photocurrent characteristics of CVD diamond radiation detectors with different electrical contacts

Cited by 21 publications

References 38 publications

X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

Properties of Diamonds and Their Application in Photodetectors

Influence of the Thin-Film Ag Electrode Deposition Thickness on the Current Characteristics of a CVD Diamond Radiation Detector

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