Contact printing of compositionally graded CdS xSe 1-x nanowire parallel arrays for tunable photodetectors

Toshitake Takahashi, Patricia Nichols, Kuniharu Takei, Alexandra C. Ford, Arash Jamshidi, Ming C. Wu, Cun-Zheng Ning, Ali Javey

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Spatially composition-graded CdS xSe 1x (x=01) nanowires are grown and transferred as parallel arrays onto Si/SiO 2 substrates by a one-step, directional contact printing process. Upon subsequent device fabrication, an array of tunable-wavelength photodetectors is demonstrated. From the spectral photoconductivity measurements, the cutoff wavelength for the device array, as determined by the bandgap, is shown to cover a significant portion of the visible spectrum. The ability to transfer a collection of crystalline semiconductor nanowires while preserving the spatially graded composition may enable a wide range of applications, such as tunable lasers and photodetectors, efficient photovoltaics, and multiplexed chemical sensors.

Original languageEnglish (US)
Article number045201
Issue number4
StatePublished - Feb 3 2012

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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