Highly sensitive, sub-microsecond polymer photodetectors for blood oxygen saturation testing
Zijin Zhao,Baiqiao Liu,Baiqiao Liu,Changlin Xie,Yao Ma,Jing Wang,Ming Liu,Kaixuan Yang,Yunhua Xu,Jian Zhang,Weiwei Li,Liang Shen,Fujun Zhang +12 more
TLDR
In this article, the bottom surface of active layers and interface of indium tin oxide (ITO) electrodes and active layers play a crucial role in determining the performance of polymer photodetectors with photomultiplication (PM-PPDs).Abstract:
Bottom surface of active layers and interface of indium tin oxide (ITO) electrodes and active layers play a crucial role in determining the performance of polymer photodetectors with photomultiplication (PM-PPDs). The interfacial trapped electron distribution closing to ITO electrodes will determine spectral response range and external quantum efficiency (EQE) of PMPPDs. The bottom interface is more sensitive than top interface when light is coming from the ITO side, and the larger density of generated charge on the bottom interfaces will induce interfacial band more bending for efficient charge tunneling injection. Highly sensitive and sub-microsecond PM-PPDs are achieved with PMBBDT:Y6 (100:7, w/w) as active layers under forward bias, yielding EQE of 18,700% at 320 nm, 21,700% at 600 nm and 16,400% at 810 nm under a bias of 7 V, respectively, as well as fast response time of 79 μs. The high EQE of the PM-PPDs is attributed to efficient hole tunneling injection from ITO electrode under forward bias. The electron traps closing to ITO electrode will be quickly filled up when light is coming from ITO side, leading to interfacial band more bending for hole tunneling injection. Importantly, the PM-PPDs is performed to measure heart rate (HR) and blood oxygen saturation (SpO2), and the measured data by the PM-PPDs are very similar with those obtained by commercial photodetectors.read more
Citations
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Wide Bandgap Polymer with Narrow Photon Harvesting in Visible Light Range Enables Efficient Semitransparent Organic Photovoltaics
Chunyu Xu,Ke Jin,Zuo Xiao,Zijin Zhao,Xiaoling Ma,Xuelin Wang,Junming Li,Wenjing Xu,Shuping Zhang,Liming Ding,Fujun Zhang +10 more
Journal ArticleDOI
Piezo-phototronic effect promoted carrier separation in coaxial p-n junctions for self-powered photodetector
TL;DR: In this paper, a fiber-shaped photodetectors constructed by vertical organic-inorganic heterostructures, which achieves self-powered behavior and promoted photoresponse under series of coaxial p-n junctions and piezo-phototronic mechanism.
Journal ArticleDOI
Piezo-phototronic effect promoted carrier separation in coaxial p-n junctions for self-powered photodetector
TL;DR: Wang et al. as discussed by the authors demonstrated fiber-shaped photodetectors constructed by vertical organic-inorganic heterostructures, which achieved self-powered behavior and promoted photoresponse under series of coaxial p-n junctions and piezo-phototronic mechanism.
Journal ArticleDOI
Recent Progress of Organic Photovoltaics with Efficiency over 17
TL;DR: In this article, typical donor and acceptor materials in prepared OPVs are summarized from the device engineering perspective, the typical research work on ternary strategy and tandem structure is introduced for understanding the device design and materials selection for preparing efficient OPVs.
Journal ArticleDOI
Highly sensitive, broad-band organic photomultiplication-type photodetectors covering UV-Vis-NIR
Ming Liu,Jian Wang,Kaixuan Yang,Zijin Zhao,Zhengji Zhou,Yao Ma,Liang Shen,Xiaoling Ma,Fujun Zhang +8 more
TL;DR: In this paper, a double-layer OPMD-OPMPD with a device structure of indium tin oxide (ITO)/zinc oxide (ZnO)/(∼150 nm) active layers/Au was fabricated, which exhibited a broad spectral response range from 300 to 1000 nm, and achieved a highly effective external quantum efficiency (EQE) of approximately 50'400% at 360 nm under an applied voltage of 5 V.
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