An organic color sensor was fabricated by using p- and n-type dyes. The cell has a layered structure of Zn0/merocyanine/rhodamine B, which acts as an n-p-n- photodiode. The spectral sensitivity of the cell was changed remarkably by bias voltage, and a good separation of the spectral responses was obtained in the visible-spectrum region.
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Kudo et al. (1981) studied this question.
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