Optical readout in pinpi'n and pini'p imagers: A comparison

P. Louro, M. Vieira, Y. Vygranenko, M. Fernandes, A. Garção

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

23 Citations (Scopus)


Optimized a-SiCH multilayer devices based on two different tandem configurations (TCO/pinpi'n/TCO and TCO/pini'p/TCO) are compared and tested for proper image recognition and color separation process using an optical readout technique. In both configurations the doped layers are based on a-SiCH to increase image resolution and to prevent image blurring. To profit from the light filtering properties of the active absorbers, the intrinsic layer of the front diode (i layer) is based on a-SiCH and the back one (i' layer) on a-Si:H. The effect of the applied voltage on the color selectivity is discussed. Results show that the relative spectral response curves demonstrate rather good separation between the red, green and blue basic colors. Combining the information obtained under positive and negative applied bias a colour image is acquired, using the same optical technique either in pinpi'n or in the pini'p configuration, without colour filters or pixel architecture.

Original languageEnglish
Title of host publicationAmorphous and Polycrystalline Thin-Film Silicon Science and Technology-2007
Number of pages6
Publication statusPublished - 1 Dec 2007
Event2007 MRS Spring Meeting - San Francisco, CA, United States
Duration: 9 Apr 200713 Apr 2007


Conference2007 MRS Spring Meeting
Country/TerritoryUnited States
CitySan Francisco, CA


  • Optical devices
  • Pixels
  • Digital filters
  • Image recognition
  • Image sensors
  • Multilayer devices
  • Optical readout technique
  • Color separation process
  • Image blurring


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