title: Observation of a photoinduced, resonant tunneling effect in a carbon nanotube-silicon heterojunction.
abstract: A significant resonant tunneling effect has been observed under the 2.4 V junction threshold in a large area, carbon nanotube-silicon (CNT-Si) heterojunction obtained by growing a continuous layer of multiwall carbon nanotubes on an n-doped silicon substrate. The multiwall carbon nanostructures were grown by a chemical vapor deposition (CVD) technique on a 60 nm thick, silicon nitride layer, deposited on an n-type Si substrate. The heterojunction characteristics were intensively studied on different substrates, resulting in high photoresponsivity with a large reverse photocurrent plateau. In this paper, we report on the photoresponsivity characteristics of the device, the heterojunction threshold and the tunnel-like effect observed as a function of applied voltage and excitation wavelength. The experiments are performed in the near-ultraviolet to near-infrared wavelength range. The high conversion efficiency of light radiation into photoelectrons observed with the presented layout allows the device to be used as a large area photodetector with very low, intrinsic dark current and noise.
authors.affiliation: INFN, Sezione di Napoli, Via Cintia 2, 80126 Napoli, Italy.
authors.forename: Carla
authors.initials: C
authors.lastname: Aramo
authors.affiliation: CNR-SPIN U.O.S. di Napoli and Dipartimento di Scienze Fisiche, Università degli Studi di Napoli "Federico II", Via Cintia 2, 80126 Napoli, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Ambrosio
authors.affiliation: INFN, Sezione di Napoli, Via Cintia 2, 80126 Napoli, Italy.
authors.forename: Michelangelo
authors.initials: M
authors.lastname: Ambrosio
authors.affiliation: Centro per Materiali e i Microsistemi Fondazione Bruno Kessler (FBK), Trento, Via Sommarive 18, 38123 Povo di Trento, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Boscardin
authors.affiliation: INFN, Sezione di Roma "Tor Vergata", Dipartimento di Fisica, Università degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy.
authors.forename: Paola
authors.initials: P
authors.lastname: Castrucci
authors.affiliation: Centro per Materiali e i Microsistemi Fondazione Bruno Kessler (FBK), Trento, Via Sommarive 18, 38123 Povo di Trento, Italy.
authors.forename: Michele
authors.initials: M
authors.lastname: Crivellari
authors.affiliation: INFN, Sezione di Napoli, Via Cintia 2, 80126 Napoli, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Cilmo
authors.affiliation: INFN, Sezione di Roma "Tor Vergata", Dipartimento di Fisica, Università degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: De Crescenzi
authors.affiliation: INFN, Sezione di Roma "Tor Vergata", Dipartimento di Fisica, Università degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: De Nicola
authors.affiliation: INFN, Sezione di Perugia, Dipartimento di Fisica, Università degli Studi di Perugia, Piazza Università 1, 06100 Perugia, Italy.
authors.forename: Emanuele
authors.initials: E
authors.lastname: Fiandrini
authors.affiliation: INFN, Sezione di L'Aquila, Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67100 Coppito, L'Aquila, Italy.
authors.forename: Valentina
authors.initials: V
authors.lastname: Grossi
authors.affiliation: INFN, Sezione di Napoli and Dipartimento di Scienze Fisiche, Università degli Studi di Napoli "Federico II", Via Cintia 2, 80126 Napoli, Italy.
authors.forename: Pasqualino
authors.initials: P
authors.lastname: Maddalena
authors.affiliation: INFN, Sezione di L'Aquila, Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67100 Coppito, L'Aquila, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Passacantando
authors.affiliation: INFN, Sezione di L'Aquila, Dipartimento di Scienze Fisiche e Chimiche, Università degli Studi dell'Aquila, Via Vetoio, 67100 Coppito, L'Aquila, Italy.
authors.forename: Sandro
authors.initials: S
authors.lastname: Santucci
authors.affiliation: INFN, Sezione di Roma "Tor Vergata", Dipartimento di Fisica, Università degli Studi di Roma "Tor Vergata", Via della Ricerca Scientifica 1, 00133 Roma, Italy.
authors.forename: Manuela
authors.initials: M
authors.lastname: Scarselli
authors.affiliation: INFN, Sezione di Bari and Dipartimento di Fisica, Università degli Studi di Bari, Via Amendola 173, 70126 Bari, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Valentini
keywords: NDR; heterojunction; multiwall carbon nanotubes; photodetector; tunneling
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