Wavelength resolution improvement on organic photodiodes made by ink-jet technique

Yu Yang, Tokuma Nakamichi, Soichiro Omi, Ryo Goto, Masayuki Yahiro, Masanao Era, Hirofumi Watanabe, Yuji Oki

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this work, a drop-on-demand piezoelectric ink-jet system has been employed to fabricate disposable photodiodes as the detectors on the integrated lab-on-chip lasers. J-aggregated films of a cyanine dye, NK-1952 doped into a conductive polymer, poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT:PSS) on the indium tin oxide (ITO) substrate have made by the ink-jet method, respectively. With the thin Al layer on the top of cyanine dye films as the cathode, while ITO substrate as the anode, the photodiodes have been demonstrated to be wavelength sensitive under the excitation of a tunable pico-second laser, which corresponds to the characteristic red-shifted, sharp and narrow J-aggregate absorption peak of each cyanine dye employed. The influence of ink-jet fabrication parameters, presence of metal ions and pH value of dye solutions on the J-aggregate formation and also the wavelength sensitivity of the photodiodes have been systematically investigated and the mechanisms involved have been discussed. It is found that by optimizing the ink-jet fabrication parameters such as UV exposure dose amount, and substrate temperature, or by introducing ions such as K+, Na+, or H+, the wavelength resolution of the ink-jet printed photodiodes can be improved significantly, and wavelength resolution of less than 0.1nm may be expected.

Original languageEnglish
Title of host publicationOrganic Photonic Materials and Devices XII
Publication statusPublished - 2010
EventOrganic Photonic Materials and Devices XII - San Francisco, CA, United States
Duration: Jan 26 2010Jan 28 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherOrganic Photonic Materials and Devices XII
Country/TerritoryUnited States
CitySan Francisco, CA

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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