Broad spectral response using carbon nanotube/organic semiconductor/C60 photodetectors.
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.
Arnold
Michael S
MS
Departments of Physics, Electrical Engineering and Computer Science, and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
Zimmerman
Jeramy D
JD
Renshaw
Christopher K
CK
Xu
Xin
X
Lunt
Richard R
RR
Austin
Christine M
CM
Forrest
Stephen R
SR
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
D037741:Fullerenes; D037742:Nanotubes, Carbon; D011108:Polymers; C069837:fullerene C60