PM6:Y6 is adopted as the active layer to prepare highly efficient organic photodetectors (OPDs), which is applied to realize a biometric sensor for real-time heart-rate monitoring. Here, the effects of the device structure, thickness, deposition process, and solvent on the subsequent performance of the OPDs are examined. Through judicious choice of the fabrication conditions, an OPD is obtained displaying a dark current density of less than 8.77 × 10⁻¹⁰ A cm⁻², a responsivity of greater than 0.516 A W⁻¹, and a high detectivity of 3.1 × 10¹³ Jones, measured at bias of −2 V (870 nm). This OPD featured a wide linear dynamic range (LDR, 530 nm) of 104 dB at −2 V, an ultrahigh cutoff frequency (750 kHz) and rise/fall times of less than 220 ns under a reverse bias of −2 V. This sub-microsecond response and high detectivity is comparable with, and in some cases better than, those of the state-of-the-art perovskite-PDs and Si-PDs. The OPD displays consistent responses, good repeatability, and stability [ambient: 50% humidity, 25 °C)]. The air-stable and portable OPD-based photoplethysmogram system provides clear signal resolution, potentially benefitting its applicability to blood pressure monitoring.

中文翻译：

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具有超高检测率和超快响应的环境稳定近红外有机光电探测器，适用于生物特征监测

采用PM6:Y6作为活性层制备高效有机光电探测器（OPDs），用于实现实时心率监测的生物传感器。在这里，研究了器件结构、厚度、沉积工艺和溶剂对 OPD 后续性能的影响。通过对制造条件的明智选择，获得的 OPD 显示出小于 8.77 × 10 ^-10 A cm ^-2的暗电流密度、大于 0.516 AW ^-1的响应度和 3.1 × 10 ^{13的高检测率}琼斯，在 -2 V (870 nm) 的偏压下测量。该 OPD 具有 -2 V 时 104 dB 的宽线性动态范围（LDR，530 nm）、超高截止频率（750 kHz）和在 -2 V 反向偏置下小于 220 ns 的上升/下降时间。亚微秒级响应和高检测率可与最先进的钙钛矿-PD 和 Si-PD 相媲美，在某些情况下甚至更好。OPD 显示出一致的响应、良好的可重复性和稳定性 [环境：50% 湿度，25 °C)]。空气稳定且便携式的基于 OPD 的光电容积描记系统提供清晰的信号分辨率，可能有利于其在血压监测中的适用性。