Nano-structured Cu(In,Al)Se2 near-infrared photodetectors

Ruo Ping Chang, Dung-Ching Perng

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


We have demonstrated nano-structured Cu(In,Al)Se2 (CIAS) near-infrared (NIR) photodetectors (PDs). The CIAS NIR PDs were fabricated on ZnO nanowires (NWs)/ZnO/Mo/ITO (indium tin oxide) glass substrate. CIAS film acted as a sensing layer and sparse ZnSe NWs, which were converted from ZnO NWs after selenization process, were embedded in the CIAS film to improve the amplification performance of the NIR PDs. X-ray diffraction patterns show that the CIAS film is a single phased polycrystalline film. Scanning electron microscopy was used to examine the morphology of the CIAS film and the growth of NWs. Two detection schemes, plain Al-CIAS-Al metal-semiconductor-metal structure and vertical structure with CIAS/ZnSe NWs annular p-n junctions, were studied. The nano-structured NIR PDs demonstrate two orders of magnitude for the annular p-n junction and one order of magnitude for the MSM structure in photocurrent amplification. The responsivities of the PDs using both sensing structures have the same cut-off frequency near 790 nm.

Original languageEnglish
Pages (from-to)238-241
Number of pages4
JournalThin Solid Films
Publication statusPublished - 2013 Feb 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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