Fingerprint Recognition Matrix Based on Photomultiplication-Type Organic Photodetectors with a Signal-to-Noise Ratio of 51,400.

Qi Yao, Shipei Li,Yunke Qin,Xingchao Zhao, Lei Wang, Yangbing Li, Sang Young Jeong,Xiaoling Ma,Han Young Woo,Fujun Zhang,Zhinong Yu,Guangcai Yuan

ACS applied materials & interfaces（2025）

School of Optics and Photonics | BOE Technology Group Co.

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Abstract

Large-area and highly sensitive image sensors are vital for undercell fingerprint recognition technology. The photomultiplication-type organic photodetector (PM-OPD) is one of the alternative choices due to its special active layers with the ratio of donor to acceptor by weight of about 100:3 for achieving single charge carrier transport channels, resulting in relatively low dark current density and high external quantum efficiency under low bias. The optimal PM-OPDs exhibit a maximal 2.1 × 1012 Jones specific detectivity at 610 nm under -6 V bias and a high signal-to-noise ratio of 51,400 at -5.2 V bias. Solution-processed PM-OPDs were prepared onto the top of a polycrystalline-silicon thin-film transistor readout circuit, and image sensors were successfully realized with 338 pixels resolution per inch. The electrical and optical properties of the fingerprint sensor were investigated, and high-quality fingerprint images were obtained.

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【要点】：论文提出了一种基于光电倍增型有机光电探测器的高灵敏度大面积指纹识别矩阵，实现了高达51,400的信噪比，创新性地提高了指纹识别的准确性和效率。

【方法】：通过优化有机光电探测器中的给体与受体比例，形成单一载流子传输通道，从而降低暗电流密度并提高外部量子效率。

【实验】：实验中在610 nm波长下，-6 V偏压时，最优PM-OPD展现出2.1 × 10^12 Jones的特定检测度，并在-5.2 V偏压下获得51,400的信噪比。使用溶液处理的PM-OPD制备在多晶硅薄膜晶体管读出电路的顶部，并成功实现了每英寸338像素分辨率的图像传感器，通过研究其电学和光学性质，获得了高质量的指纹图像。实验未提及具体使用的数据集名称。