title: Nitrogen doped n-type CdS nanoribbons with tunable electrical and photoelectrical properties.
abstract: Single-crystal nitrogen doped CdS nanoribbons (NRs) with wurtzite structure were synthesized in ammonia atmosphere via a thermal evaporation deposition route. X-ray diffraction patterns reveal a significant contraction of the lattice constants due to the incorporation of nitrogen. Temperature-varied photoluminescence spectra of CdS:N NRs exhibit spectral features near the band edge, which can be ascribed to free excition and neutral acceptor-bound excition emissions. Electrical and photoelectrical properties of the CdS:N NRs were systemically studied by constructing the field-effect transistors based on individual NRs. The conductivity of the NRs can be tuned by two orders of magnitude by controlling the N doping concentration. Moreover, by post-annealing, the device performance is remarkably improved, in particular, the mobility of the CdS:N NRs is increased by nearly three orders of magnitude from approximately 10(-1) to hundreds of cm2/Vs. I(on)I(off) ratio of the annealed device reaches over 10(4). Photoconductive properties of the CdS:N NRs were also studied. The doped NRs show high sensitivity to the light with energy larger than band-gap and the response amplitude and speed depend on the doping concentration.
authors: School of Materials Science and Engineering, Hefei University of Technology, Hefei, Anhui 230009, PR China.
authors: Bo
authors: B
authors: Wu
authors: Yang
authors: Y
authors: Jiang
authors: Di
authors: D
authors: Wu
authors: Shanying
authors: S
authors: Li
authors: Li
authors: L
authors: Wang
authors: Yongqing
authors: Y
authors: Yu
authors: Zhuangbing
authors: Z
authors: Wang
authors: Jiansheng
authors: J
authors: Jie
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008163:Luminescent Measurements / Q000295:instrumentation*; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D009584:Nitrogen / Q000737:chemistry*; D010316:Particle Size; D013440:Sulfides / Q000737:chemistry*; D014173:Transistors, Electronic
chemical_list: D019187:Cadmium Compounds; D013440:Sulfides; C034939:cadmium sulfide; D009584:Nitrogen