研究目的
To develop a high-resolution thin-film fingerprint sensor using a printed organic photodetector (OPD) for large-area light sensing applications.
研究成果
The developed optical fingerprint scanner using a slot-die coated OPD frontplane and an a-IGZO DG-SA TFT backplane shows excellent performance with low dark currents, high detectivity, and high spatial resolution. The technology is compatible with flat panel display manufacturing lines, enabling cost-effective upscaling to large sizes.
研究不足
The challenge of processing large-area, homogeneous thin OPD films by conventional coating techniques and the need for improvement in the external quantum efficiency (EQE) for higher contrast fingerprint images.
1：Experimental Design and Method Selection:
The study involves the development of slot-die-coated large-area bulk heterojunction organic photodiode (OPD) arrays with a novel electron transport layer and molybdenum oxide top-electrode to reduce dark current densities.
2：Sample Selection and Data Sources:
The OPD test devices were fabricated with the same layer structure and processing conditions as the OPD frontplane.
3：List of Experimental Equipment and Materials:
Includes a polyimide precursor, glass carrier, SiNx layer, Mo-alloy bottom gate electrode, SiO2, IGZO, PCDTBT:PCBM blend, MoOx/Ag electrodes, and a transparent thin film encapsulation stack.
4：Experimental Procedures and Operational Workflow:
The process involves deposition and patterning of various layers, slot-die coating of the active layer, and encapsulation.
5：Data Analysis Methods:
Characterization includes current versus voltage measurements, external quantum efficiency, and modulation transfer function (MTF) analysis.
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