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High-Performance Wearable Organic Photodetectors by Molecular Design and Green Solvent Processing for Pulse Oximetry and Photoplethysmography
Advanced Materials ( IF 27.4 ) Pub Date : 2023-12-06 , DOI: 10.1002/adma.202310478
Zhifang Du 1 , Hoang Mai Luong 1 , Sina Sabury 2 , Austin L Jones 2 , Ziyue Zhu 1 , Patchareepond Panoy 1 , Sangmin Chae 1 , Ahra Yi 3 , Hyo Jung Kim 3 , Steven Xiao 4 , Viktor V Brus 5 , G N Manjunatha Reddy 6 , John R Reynolds 2 , Thuc-Quyen Nguyen 1
Advanced Materials ( IF 27.4 ) Pub Date : 2023-12-06 , DOI: 10.1002/adma.202310478
Zhifang Du 1 , Hoang Mai Luong 1 , Sina Sabury 2 , Austin L Jones 2 , Ziyue Zhu 1 , Patchareepond Panoy 1 , Sangmin Chae 1 , Ahra Yi 3 , Hyo Jung Kim 3 , Steven Xiao 4 , Viktor V Brus 5 , G N Manjunatha Reddy 6 , John R Reynolds 2 , Thuc-Quyen Nguyen 1
Affiliation
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White-light detection from the visible to the near-infrared region is central to many applications such as high-speed cameras, autonomous vehicles, and wearable electronics. While organic photodetectors (OPDs) are being developed for such applications, several challenges must be overcome to produce scalable high-detectivity OPDs. This includes issues associated with low responsivity, narrow absorption range, and environmentally friendly device fabrication. Here, an OPD system processed from 2-methyltetrahydrofuran (2-MeTHF) sets a record in light detectivity, which is also comparable with commercially available silicon-based photodiodes is reported. The newly designed OPD is employed in wearable devices to monitor heart rate and blood oxygen saturation using a flexible OPD-based finger pulse oximeter. In achieving this, a framework for a detailed understanding of the structure–processing–property relationship in these OPDs is also developed. The bulk heterojunction (BHJ) thin films processed from 2-MeTHF are characterized at different length scales with advanced techniques. The BHJ morphology exhibits optimal intermixing and phase separation of donor and acceptor moieties, which facilitates the charge generation and collection process. Benefitting from high charge carrier mobilities and a low shunt leakage current, the newly developed OPD exhibits a specific detectivity of above 1012 Jones over 400–900 nm, which is higher than those of reference devices processed from chlorobenzene and ortho-xylene.
中文翻译：
通过分子设计和绿色溶剂处理实现脉搏血氧饱和度和光电容积描记法的高性能可穿戴有机光电探测器
从可见光到近红外区域的白光检测是高速摄像机、自动驾驶汽车和可穿戴电子产品等许多应用的核心。虽然正在为此类应用开发有机光电探测器 (OPD)，但必须克服一些挑战才能生产可扩展的高探测率 OPD。这包括与低响应率、窄吸收范围和环保设备制造相关的问题。据报道，由 2-甲基四氢呋喃 (2-MeTHF) 加工而成的 OPD 系统创下了光探测率的记录，这也可与市售的硅基光电二极管相媲美。新设计的 OPD 用于可穿戴设备，使用基于 OPD 的灵活手指脉搏血氧计来监测心率和血氧饱和度。为了实现这一目标，还开发了一个详细理解这些 OPD 中的结构-加工-性能关系的框架。采用先进技术对由 2-MeTHF 加工而成的体异质结 (BHJ) 薄膜进行了不同长度尺度的表征。 BHJ 形态表现出供体和受体部分的最佳混合和相分离，这有利于电荷的产生和收集过程。得益于高载流子迁移率和低分流漏电流，新开发的 OPD 在 400-900 nm 范围内表现出高于 10 12 Jones 的比探测率，高于由氯苯和邻二甲苯加工的参考器件。
更新日期：2023-12-06
中文翻译：
通过分子设计和绿色溶剂处理实现脉搏血氧饱和度和光电容积描记法的高性能可穿戴有机光电探测器
从可见光到近红外区域的白光检测是高速摄像机、自动驾驶汽车和可穿戴电子产品等许多应用的核心。虽然正在为此类应用开发有机光电探测器 (OPD)，但必须克服一些挑战才能生产可扩展的高探测率 OPD。这包括与低响应率、窄吸收范围和环保设备制造相关的问题。据报道，由 2-甲基四氢呋喃 (2-MeTHF) 加工而成的 OPD 系统创下了光探测率的记录，这也可与市售的硅基光电二极管相媲美。新设计的 OPD 用于可穿戴设备，使用基于 OPD 的灵活手指脉搏血氧计来监测心率和血氧饱和度。为了实现这一目标，还开发了一个详细理解这些 OPD 中的结构-加工-性能关系的框架。采用先进技术对由 2-MeTHF 加工而成的体异质结 (BHJ) 薄膜进行了不同长度尺度的表征。 BHJ 形态表现出供体和受体部分的最佳混合和相分离，这有利于电荷的产生和收集过程。得益于高载流子迁移率和低分流漏电流，新开发的 OPD 在 400-900 nm 范围内表现出高于 10 12 Jones 的比探测率，高于由氯苯和邻二甲苯加工的参考器件。
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