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Title: Arrays of ZnO/CuIn{sub x}Ga{sub 1−x}Se{sub 2} nanocables with tunable shell composition for efficient photovoltaics

Arrays of one-dimensional (1D) nanostructure are receiving much attention for their optoelectronic and photovoltaic applications due to their advantages in light absorption, charge separation, and transportation. In this work, arrays of ZnO/CuIn{sub x}Ga{sub 1−x}Se{sub 2} core/shell nanocables with tunable shell compositions over the full range of 0 ≤ x ≤ 1 have been controllably synthesized. Chemical conversions of ZnO nanorods to a series of ZnO-based nanocables, including ZnO/ZnSe, ZnO/CuSe, ZnO/CuSe/In{sub x}Ga{sub 1−x}, ZnO/CuSe/(In{sub x}Ga{sub 1−x}){sub 2}Se{sub 3}, and ZnO/CuIn{sub x}Ga{sub 1−x}Se{sub 2}, are well designed and successfully achieved. Composition-dependent influences of the CuIn{sub x}Ga{sub 1−x}Se{sub 2} shells on photovoltaic performance are investigated. It is found that the increase in indium content (x) leads to an increase in short-circuit current density (J{sub SC}) but a decrease in open-circuit voltage (V{sub OC}) for the ZnO/CuIn{sub x}Ga{sub 1−x}Se{sub 2} nanocable solar cells. An array of ZnO/CuIn{sub 0.67}Ga{sub 0.33}Se{sub 2} nanocables with a length of ∼1 μm and a shell thickness of ∼10 nm exhibits a bandgap of 1.20 eV, and yields a maximum power conversion efficiency of 1.74% under AM 1.5 G illumination at an intensity of 100 mW/cm{sup 2}. It dramatically surpasses that (0.22%) of the ZnO/CuIn{sub 0.67}Ga{sub 0.33}Se{sub 2} planar thin-film device. Our work reveals that 1D nanoarray allowsmore » efficient photovoltaics without using toxic CdS buffer layer.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [2]
  1. Center of Super-Diamond and Advanced Films (COSDAF), Department of Physics and Materials Science, City University of Hong Kong, Hong Kong (Hong Kong)
  2. (Hong Kong)
  3. (Pakistan)
  4. School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei 230009 (China)
  5. School of Chemical and Materials Engineering, National University of Sciences and Technology, Sector H-12, Islamabad 44000 (Pakistan)
Publication Date:
OSTI Identifier:
22410261
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 20; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CADMIUM SULFIDES; CONCENTRATION RATIO; COPPER SELENIDES; CURRENT DENSITY; EFFICIENCY; ELECTRIC POTENTIAL; EV RANGE; GALLIUM SELENIDES; ILLUMINANCE; INDIUM SELENIDES; LAYERS; NANOSTRUCTURES; PHOTOVOLTAIC EFFECT; SOLAR CELLS; THIN FILMS; VISIBLE RADIATION; ZINC OXIDES; ZINC SELENIDES