Vertically integrated thin film color sensor arrays for imaging applications

Area of Science:

• Materials Science
• Electrical Engineering
• Optoelectronics

Background:

• Traditional color sensors often rely on optical filters, increasing complexity and cost.
• Vertically integrated thin-film sensors offer a path towards miniaturization and enhanced functionality.
• Amorphous silicon technology is a cost-effective solution for large-area electronic applications.

Purpose of the Study:

• To develop and characterize large-area color sensor arrays using vertically integrated thin-film sensors.
• To demonstrate the detection of complete color information at each pixel without optical filters.
• To analyze the image quality and pixel crosstalk of the developed sensor arrays.

Main Methods:

• Fabrication of vertically integrated amorphous silicon thin-film color sensors atop amorphous silicon readout transistors.
• Control of spectral sensitivity through applied bias voltage.
• Analysis of image quality using line spread function (LSF) and modulation transfer function (MTF) measurements.

Main Results:

• Successful realization of large-area color sensor arrays capable of capturing full color information per pixel.
• Demonstration that spectral sensitivity is tunable via bias voltage, eliminating the need for optical filters.
• Characterization of sensor performance, including analysis of image quality and pixel crosstalk.

Conclusions:

• Vertically integrated thin-film sensors provide a filterless approach for large-area color sensing.
• Amorphous silicon technology is suitable for fabricating advanced color sensor arrays with tunable spectral sensitivity.
• The developed sensor arrays exhibit promising image quality and manageable pixel crosstalk for practical applications.