Black diamond is an emerging material for solar applications. The femtosecond laser surface treatment of pristine transparent diamond allows the solar absorptance to be increased to values greater than 90% from semi-transparency conditions. In addition, the defects introduced by fs-laser treatment strongly increase the diamond surface electrical conductivity and a very-low activation energy is observed at room temperature. In this work, the investigation of electronic transport mechanisms of a fs-laser nanotextured diamond surface is reported. The charge transport was studied down to cryogenic temperatures, in the 30–300 K range. The samples show an activation energy of a few tens of meV in the highest temperature interval and for T < 50 K, the activation energy diminishes to a few meV. Moreover, thanks to fast cycles of measurement, we noticed that the black-diamond samples also seem to show a behavior close to ferromagnetic materials, suggesting electron spin influence over the transport properties. The mentioned properties open a new perspective in designing novel diamond-based biosensors and a deep knowledge of the charge-carrier transport in black diamond becomes fundamental.

Orsini, A., Barettin, D., Ercoli, F., Rossi, M.c., Pettinato, S., Salvatori, S., et al. (2022). Charge transport mechanisms of black diamond at cryogenic temperatures. NANOMATERIALS, 12(13) [10.3390/nano12132253].

Charge transport mechanisms of black diamond at cryogenic temperatures

Polini R.;
2022-06-30

Abstract

Black diamond is an emerging material for solar applications. The femtosecond laser surface treatment of pristine transparent diamond allows the solar absorptance to be increased to values greater than 90% from semi-transparency conditions. In addition, the defects introduced by fs-laser treatment strongly increase the diamond surface electrical conductivity and a very-low activation energy is observed at room temperature. In this work, the investigation of electronic transport mechanisms of a fs-laser nanotextured diamond surface is reported. The charge transport was studied down to cryogenic temperatures, in the 30–300 K range. The samples show an activation energy of a few tens of meV in the highest temperature interval and for T < 50 K, the activation energy diminishes to a few meV. Moreover, thanks to fast cycles of measurement, we noticed that the black-diamond samples also seem to show a behavior close to ferromagnetic materials, suggesting electron spin influence over the transport properties. The mentioned properties open a new perspective in designing novel diamond-based biosensors and a deep knowledge of the charge-carrier transport in black diamond becomes fundamental.
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/03
Settore FIS/03
English
Con Impact Factor ISI
activation energy
black diamond
cryogenic temperatures
electric conductivity
LIPSS
variable range hopping
Financial support from the European Community, FP7 FET-Energy Project ProME3ThE2US2 “Production Method of Electrical Energy by Enhanced Thermal Electron Emission by the Use of Superior Semiconductors”.
Orsini, A., Barettin, D., Ercoli, F., Rossi, M.c., Pettinato, S., Salvatori, S., et al. (2022). Charge transport mechanisms of black diamond at cryogenic temperatures. NANOMATERIALS, 12(13) [10.3390/nano12132253].
Orsini, A; Barettin, D; Ercoli, F; Rossi, Mc; Pettinato, S; Salvatori, S; Mezzi, A; Polini, R; Bellucci, A; Mastellone, M; Girolami, M; Valentini, V; Orlando, S; Trucchi, Dm
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/303554
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