title: Broad spectral response using carbon nanotube/organic semiconductor/C60 photodetectors.
abstract: We demonstrate that photogenerated excitons in semiconducting carbon nanotubes (CNTs) can be efficiently dissociated by forming a planar heterojunction between CNTs wrapped in semiconducting polymers and the electron acceptor, C(60). Illumination of the CNTs at their near-infrared optical band gap results in the generation of a short-circuit photocurrent with peak external and internal quantum efficiencies of 2.3% and 44%, respectively. Using soft CNT-hybrid materials systems combining semiconducting small molecules and polymers, we have fabricated broad-band photodetectors with a specific detectivity >10(10) cm Hz(1/2) W(1-) from lambda = 400 to 1450 nm and a response time of tau = 7.2 +/- 0.2 ns.
authors.affiliation: Departments of Physics, Electrical Engineering and Computer Science, and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Arnold
authors.forename: Jeramy D
authors.initials: JD
authors.lastname: Zimmerman
authors.forename: Christopher K
authors.initials: CK
authors.lastname: Renshaw
authors.forename: Xin
authors.initials: X
authors.lastname: Xu
authors.forename: Richard R
authors.initials: RR
authors.lastname: Lunt
authors.forename: Christine M
authors.initials: CM
authors.lastname: Austin
authors.forename: Stephen R
authors.initials: SR
authors.lastname: Forrest
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D008422:Materials Testing; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D010777:Photochemistry; D011108:Polymers / Q000737:chemistry*; D011789:Quantum Theory; D012666:Semiconductors; D013499:Surface Properties
chemical_list: D037741:Fullerenes; D037742:Nanotubes, Carbon; D011108:Polymers; C069837:fullerene C60