title: Polarization-sensitive nanowire photodetectors based on solution-synthesized CdSe quantum-wire solids.
abstract: Polarization-sensitive photodetectors are demonstrated using solution-synthesized CdSe nanowire (NW) solids. Photocurrent action spectra taken with a tunable white light source match the solution linear absorption spectra of the NWs, showing that the NW network is responsible for the device photoconductivity. Temperature-dependent transport measurements reveal that carriers responsible for the dark current through the nanowire solids are thermally excited across CdSe band gap. The NWs are aligned using dielectrophoresis between prepatterned electrodes using conventional optical photolithography. The photocurrent through the NW solid is found to be polarization-sensitive, consistent with complementary absorption (emission) measurements of both single wires and their ensembles. The range of solution-processed semiconducting NW materials, their facile synthesis, ease of device fabrication, and compatibility with a variety of substrates make them attractive for potential nanoscale polarization-sensitive photodetectors.
authors.affiliation: Department of Electrical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: Amol
authors.initials: A
authors.lastname: Singh
authors.forename: Xiangyang
authors.initials: X
authors.lastname: Li
authors.forename: Vladimir
authors.initials: V
authors.lastname: Protasenko
authors.forename: Gabor
authors.initials: G
authors.lastname: Galantai
authors.forename: Masaru
authors.initials: M
authors.lastname: Kuno
authors.forename: Huili Grace
authors.initials: HG
authors.lastname: Xing
authors.forename: Debdeep
authors.initials: D
authors.lastname: Jena
mesh_terms: D016880:Anisotropy; D019187:Cadmium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D003460:Crystallization / Q000379:methods; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000295:instrumentation / Q000379:methods; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D010777:Photochemistry / Q000295:instrumentation* / Q000379:methods; D045663:Quantum Dots; D011789:Quantum Theory; D018036:Selenium Compounds / Q000737:chemistry* / Q000528:radiation effects*; D012680:Sensitivity and Specificity; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014159:Transducers
chemical_list: D019187:Cadmium Compounds; D046911:Macromolecular Substances; D018036:Selenium Compounds; C009495:titanium dioxide; C058667:cadmium selenide; D014025:Titanium