Synthesis of Type II CdTe−CdSe Nanocrystal Heterostructured Multiple-Branched Rods and Their Photovoltaic Applications

Novel type II CdTe−CdSe semiconductor nanocrystal heterostructures with multiple-branched rod morphology were synthesized by epitaxial growth of CdSe from CdTe nanocrystals in solution, and the SNCHs were characterized by transmission electron microscopy, high-resolution TEM, energy-dispersive spectrometry, and X-ray diffraction analysis

Haizheng Zhong; Yi Zhou; Yi Yang; Chunhe Yang; Yongfang Li

2007

Scholarcy highlights

  • Novel type II CdTe−CdSe semiconductor nanocrystal heterostructures with multiple-branched rod morphology were synthesized by epitaxial growth of CdSe from CdTe nanocrystals in solution, and the SNCHs were characterized by transmission electron microscopy, high-resolution TEM, energy-dispersive spectrometry, and X-ray diffraction analysis
  • The SNCHs are composed of a CdTe core and CdSe branches, and most of the heterostructured nanocrystals have about 10 branched rods with thickness of 3−5 nm and length of 10−30 nm
  • The photovoltaic properties of the SNCHs were studied on the basis of the devices with single component of the SNCHs and with the blend of P3HT and the SNCHs
  • The device based on the SNCHs single component showed an open-circuit voltage of 0.40 V, a short-circuit current density of 0.018 mA/cm2, fill factor of 38%, and power convention efficiency of 0.003% under the illumination of AM1.5, 100 mW/cm2, which is greatly improved in comparison with that of the homostructured semiconductor nanocrystals
  • For the hybrid P3HT/SNCHs device, the Jsc, Voc, fill factor, and η of the device reached 0.58 mA/cm2, 0.63V, 43%, and 0.16% respectively

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