Abstract

In this paper, two types of detectors, one with a coplanar and the other with a sandwich geometry using an identical CVD diamond film, are fabricated in order to investigate the effects of the film microstructure on the performance of diamond film α-particle detectors. An average charge collection efficiency of 42.9% for the coplanar structure and of 37.4% for the sandwich structure detectors is obtained, respectively. Raman scattering studies directly demonstrate that the different counts, collection efficiencies and photocurrents of the two types of detectors mainly result from the different micro-structural features between the final growth side and the nucleation side of the diamond film. Under α particle irradiation the detector with sandwich geometry has a similar trend on energy resolution with coplanar geometry under different applied electric field. A good energy resolution of 1.1% is obtained for both detectors.

© 2005 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

Appl. Surf. Sci. (1)

Givargizov E. I., et al., �??Field emission characteristics of polycrystalline and single-crystalline diamond grown on Si tips,�?? Appl. Surf. Sci. 94-95, 117-112(1996).
[CrossRef]

IEEE Trans. Nucl. Sci. (2)

Kozlov S. F., et al., �??Diamond dosimeter for X-ray and gamma-radiation,�?? IEEE Trans. Nucl. Sci. NS-24, 235-237(1976).

Nava F., et al., �??Transport properties of natural diamond used as nuclear particle detector for a wide temperature range,�?? IEEE Trans. Nucl. Sci. NS-26, 308-315(1979).
[CrossRef]

J. Appl. Phys. (1)

Marinelli M., et al., �??Systematic study of the normal and pumped state of high efficiency diamond particle detectors grown by chemical vapor deposition,�?? J. Appl. Phys. 89, 1430(2001).
[CrossRef]

J. Crystal Growth (1)

Zhang M. L., et al., �??Effects of the deposition conditions and annealing process on the electric properties of hot-filament CVD diamond films,�?? J. Crystal Growth 274, 1-27(2005).
[CrossRef]

J. Phys. D: Appl. Phys. (1)

Wang L. J., et al., �??Infrared optical properties of diamond films and electrical properties of CVD diamond detectors,�?? J. Phys. D: Appl. Phys. 36, 2548-2552(2003).
[CrossRef]

Nucl. Instrum. Methods A (1)

Adam W., et al., �??Pulse height distribution and radiation tolerance of CVD diamond detectors,�?? Nucl. Instrum. Methods A 447, 244-250(2000).
[CrossRef]

Phys. Med. Biol. (1)

Vatnitsky S., et al., �??Application of a natural diamond detector for the measurement of relative dose distributions in radiotherapy,�?? Phys. Med. Biol. 38, 173-184(1993).
[CrossRef] [PubMed]

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Figures (8)

Fig. 1.
Fig. 1.

The schematic diagram of the α-particle detector.

Fig. 2.
Fig. 2.

The optical microscopic image of detector electrode structure patterned on the unpolished “growth” side of the diamond film.

Fig. 3.
Fig. 3.

SEM image of CVD diamond film used for α-particle detectors.

Fig. 4.
Fig. 4.

Raman spectra for the final growth side and the nucleation side of the CVD diamond film.

Fig. 5.
Fig. 5.

Pulse height distributions obtained by the CVD diamond detector with different device geometry exposed to α particles.

Fig. 6.
Fig. 6.

Counts and average charge collection efficiency plot of diamond-based alpha-particle detector with coplanar and sandwich electrode geometry respectively.

Fig. 7.
Fig. 7.

The I-V curves of the detector with different electrode geometry under various applied bias voltage.

Fig. 8.
Fig. 8.

The ratio of the full width at half maximum (FWHM, ∆E) to the 5.5MeV 241Am full-energy peak (E) of the pulse height distribution of the detector with different electrode geometry under various applied electric field.

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