High-Performance Wearable Organic Photodetectors by Molecular Design and Green Solvent Processing for Pulse Oximetry and Photoplethysmography

被引：31

作者：

Du, Zhifang ^{[1
]}

Luong, Hoang Mai ^{[1
]}

Sabury, Sina ^{[2
]}

Jones, Austin L. ^{[2
]}

Zhu, Ziyue ^{[1
]}

Panoy, Patchareepond ^{[1
]}

Chae, Sangmin ^{[1
]}

Yi, Ahra ^{[3
]}

Kim, Hyo Jung ^{[3
]}

Xiao, Steven ^{[4
]}

Brus, Viktor V. ^{[5
]}

Reddy, G. N. Manjunatha ^{[6
]}

Reynolds, John R. ^{[2
]}

Nguyen, Thuc-Quyen ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Dept Chem & Biochem, Santa Barbara, CA 93106 USA

[2] Georgia Inst Technol, Georgia Tech Polymer Network, Ctr Organ Photon & Elect, Sch Mat Sci & Engn,Sch Chem & Biochem, Atlanta, GA 30332 USA

[3] Pusan Natl Univ, Sch Chem Engn, Dept Organ Mat Sci & Engn, Busan 46241, South Korea

[4] 1 Material Inc, 2290 Chemin St Francois, Dorval, PQ H9P 1K2, Canada

[5] Nazarbayev Univ, Sch Sci & Humanities, Dept Phys, Nur Sultan City 010000, Kazakhstan

[6] Univ Artois, Univ Lille, Cent Lille Inst, Unite Catalyse & Chim Solide,CNRS,UMR 8181, F-59000 Lille, France

来源：

ADVANCED MATERIALS | 2024年 / 36卷 / 09期

基金：

欧盟地平线“2020”;

关键词：

green solvents; organic photodetectors; pulse oximetry and photoplethysmography; solid-state NMR; SOLAR-CELLS; BULK; RECOMBINATION; CRYSTALLIZATION; DETECTIVITY; GENERATION; MORPHOLOGY; FULLERENE;

D O I：

10.1002/adma.202310478

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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. Organic photodetectors processed from a biomass-derived solvent, namely 2-methyltetrahydrofuran, which simultaneously exhibits a remarkably high detectivity and surpasses the performances of devices processed from conventional chlorinated solvents, are developed. Furthermore, such devices can also be used as smart wearable devices for medical applications, such as heart pulse rate monitoring and blood oxygen saturation assessment.image

引用

页数：12

共 59 条

[1] Greening the Solid-Phase Peptide Synthesis Process. 2-MeTHF for the Incorporation of the First Amino Acid and Precipitation of Peptides after Global Deprotection [J].