A 128×96 pixel stack-type color image sensor: stack of individual blue-, green-, and red-sensitive organic photoconductive films integrated with a ZnO thin film transistor readout circuit

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  • A 128 96 pixel stack type color image sensor stack of individual blue green and red sensitive organic photoconductive films integrated with a ZnO thin film transistor readout circuit

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<jats:p> A color image was produced by a vertically stacked image sensor with blue (B)-, green (G)-, and red (R)-sensitive organic photoconductive films, each having a thin-film transistor (TFT) array that uses a zinc oxide (ZnO) channel to read out the signal generated in each organic film. The number of the pixels of the fabricated image sensor is 128×96 for each color, and the pixel size is 100×100 µm<jats:sup>2</jats:sup>. The current on/off ratio of the ZnO TFT is over 10<jats:sup>6</jats:sup>, and the B-, G-, and R-sensitive organic photoconductive films show excellent wavelength selectivity. The stacked image sensor can produce a color image at 10 frames per second with a resolution corresponding to the pixel number. This result clearly shows that color separation is achieved without using any conventional color separation optical system such as a color filter array or a prism. </jats:p>

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