A CMOS image sensor for monochromatic spectrum imaging

A CMOS image sensor based on standard CMOS process which can image the monochromatic spectrum image was developed. It took the advantage of the penetration depth differences of monochromatic light in silicon. Through the usage of double junctions photodiode which can sense short wavelength and long wavelength illumination simultaneously, we got the final device response which increase monotonically with the wavelength, and the wavelength can be known through this monotonicity. First we introduced the basic principle of the device, then ideas in pixel design and array readout circuitry were given, finally we measured the manufactured device, the QEs of the device and the monotonic relationship between the device and the wavelength of the monochromatic spectrum were given.