Stacked color image sensor using wavelength-selective organic photoconductive films with zinc-oxide thin film transistors as a signal readout circuit

Hokuto Seo; Satoshi Aihara; Masakazu Namba; Toshihisa Watabe; Hiroshi Ohtake; Misao Kubota; Norifumi Egami; Takahiro Hiramatsu; Tokiyoshi Matsuda; Mamoru Furuta; Hiroshi Nitta; Takashi Hirao

doi:10.1117/12.838347

25 January 2010 Stacked color image sensor using wavelength-selective organic photoconductive films with zinc-oxide thin film transistors as a signal readout circuit

Hokuto Seo, Satoshi Aihara, Masakazu Namba, Toshihisa Watabe, Hiroshi Ohtake, Misao Kubota, Norifumi Egami, Takahiro Hiramatsu, Tokiyoshi Matsuda, Mamoru Furuta, Hiroshi Nitta, Takashi Hirao

Author Affiliations +

Proceedings Volume 7536, Sensors, Cameras, and Systems for Industrial/Scientific Applications XI; 753602 (2010) https://doi.org/10.1117/12.838347
Event: IS&T/SPIE Electronic Imaging, 2010, San Jose, California, United States

Abstract

Our group has been developing a new type of image sensor overlaid with three organic photoconductive films, which are individually sensitive to only one of the primary color components (blue (B), green (G), or red (R) light), with the aim of developing a compact, high resolution color camera without any color separation optical systems. In this paper, we firstly revealed the unique characteristics of organic photoconductive films. Only choosing organic materials can tune the photoconductive properties of the film, especially excellent wavelength selectivities which are good enough to divide the incident light into three primary colors. Color separation with vertically stacked organic films was also shown. In addition, the high-resolution of organic photoconductive films sufficient for high-definition television (HDTV) was confirmed in a shooting experiment using a camera tube. Secondly, as a step toward our goal, we fabricated a stacked organic image sensor with G- and R-sensitive organic photoconductive films, each of which had a zinc oxide (ZnO) thin film transistor (TFT) readout circuit, and demonstrated image pickup at a TV frame rate. A color image with a resolution corresponding to the pixel number of the ZnO TFT readout circuit was obtained from the stacked image sensor. These results show the potential for the development of high-resolution prism-less color cameras with stacked organic photoconductive films.

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Hokuto Seo, Satoshi Aihara, Masakazu Namba, Toshihisa Watabe, Hiroshi Ohtake, Misao Kubota, Norifumi Egami, Takahiro Hiramatsu, Tokiyoshi Matsuda, Mamoru Furuta, Hiroshi Nitta, and Takashi Hirao "Stacked color image sensor using wavelength-selective organic photoconductive films with zinc-oxide thin film transistors as a signal readout circuit", Proc. SPIE 7536, Sensors, Cameras, and Systems for Industrial/Scientific Applications XI, 753602 (25 January 2010); https://doi.org/10.1117/12.838347

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