Single walled carbon nanotube/n-Si (SWCNT/n-Si) hetero-junctions have been obtained by depositing SWCNT ultra-thin films on the surface of an n-Si substrate by dry transfer method. The as obtained junctions are photo sensitive in the measured wavelength range (300-1000 nm) and show zero bias responsivity and detectivity values of the order of 1 A W-1 and 1014 Jones respectively, which are higher than those previously observed in carbon based devices. Moreover, under on-off light excitation, the junctions show response speed as fast as 1 μs or better and noise equivalent powers comparable to commercial Si photomultipliers. Current-voltage measurements in dark and under illumination suggest that the devices consist of Schottky and semiconductor/semiconductor junctions both contributing to the fast and high responses observed.
Salvato, M., Scagliotti, M., De Crescenzi, M., Crivellari, M., Prosposito, P., Cacciotti, I., et al. (2017). Single walled carbon nanotube/Si heterojunctions for high responsivity photodetectors. NANOTECHNOLOGY, 28(43), 435201 [10.1088/1361-6528/aa8797].
Single walled carbon nanotube/Si heterojunctions for high responsivity photodetectors
Salvato M.
;De Crescenzi M.;Prosposito P.;Cacciotti I.;Castrucci P.
2017-01-01
Abstract
Single walled carbon nanotube/n-Si (SWCNT/n-Si) hetero-junctions have been obtained by depositing SWCNT ultra-thin films on the surface of an n-Si substrate by dry transfer method. The as obtained junctions are photo sensitive in the measured wavelength range (300-1000 nm) and show zero bias responsivity and detectivity values of the order of 1 A W-1 and 1014 Jones respectively, which are higher than those previously observed in carbon based devices. Moreover, under on-off light excitation, the junctions show response speed as fast as 1 μs or better and noise equivalent powers comparable to commercial Si photomultipliers. Current-voltage measurements in dark and under illumination suggest that the devices consist of Schottky and semiconductor/semiconductor junctions both contributing to the fast and high responses observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
