scholarly journals Ultraflexible Near-Infrared Organic Photodetectors for Conformal Photoplethysmogram Sensors

2018 ◽  
Vol 30 (34) ◽  
pp. 1802359 ◽  
Author(s):  
Sungjun Park ◽  
Kenjiro Fukuda ◽  
Ming Wang ◽  
Chulhyo Lee ◽  
Tomoyuki Yokota ◽  
...  
Keyword(s):  
Near Infrared ◽  
Organic Photodetectors

scholarly journals Stacked Dual‐Wavelength Near‐Infrared Organic Photodetectors

2020 ◽  
pp. 2001784
Author(s):  
Yazhong Wang ◽  
Bernhard Siegmund ◽  
Zheng Tang ◽  
Zaifei Ma ◽  
Jonas Kublitski ◽  
...  
Keyword(s):  
Near Infrared ◽  
Dual Wavelength ◽  
Organic Photodetectors

scholarly journals Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonas Kublitski ◽  
Axel Fischer ◽  
Shen Xing ◽  
Lukasz Baisinger ◽  
Eva Bittrich ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Near Infrared ◽  
Optical Cavity ◽  
Hole Injection ◽  
Visible Range ◽  
Absorption Region ◽  
Electromagnetic Signals ◽  
Organic Photodetectors

AbstractDetection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photodetectors have been shown to achieve high quantum efficiencies mainly in the visible range. Much less research has been focused on realizing near-infrared narrowband devices. Here, we demonstrate fully vacuum-processed narrow- and broadband photomultiplication-type organic photodetectors. Devices are based on enhanced hole injection leading to a maximum external quantum efficiency of almost 2000% at −10 V for the broadband device. The photomultiplicative effect is also observed in the charge-transfer state absorption region. By making use of an optical cavity device architecture, we enhance the charge-transfer response and demonstrate a wavelength tunable narrowband photomultiplication-type organic photodetector with external quantum efficiencies superior to those of pin-devices. The presented concept can further improve the performance of photodetectors based on the absorption of charge-transfer states, which were so far limited by the low external quantum efficiency provided by these devices.

Ultraviolet to near-infrared broadband organic photodetectors with photomultiplication

2020 ◽  
Vol 83 ◽  
pp. 105739 ◽  
Author(s):  
Kaixuan Yang ◽  
Jian Wang ◽  
Zijin Zhao ◽  
Fenggui Zhao ◽  
Kai Wang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Organic Photodetectors

High-Sensitivity Visible–Near Infrared Organic Photodetectors Based on Non-Fullerene Acceptors

2020 ◽  
Vol 12 (15) ◽  
pp. 17769-17775 ◽  
Author(s):  
Guanghong Liu ◽  
Tengfei Li ◽  
Xiaowei Zhan ◽  
Hongbin Wu ◽  
Yong Cao
Keyword(s):  
Near Infrared ◽  
High Sensitivity ◽  
Organic Photodetectors

Recent advances in organic near-infrared photodiodes

2018 ◽  
Vol 6 (14) ◽  
pp. 3499-3513 ◽  
Author(s):  
Xiaodong Liu ◽  
Yiwei Lin ◽  
Yingjie Liao ◽  
Jiazun Wu ◽  
Yonghao Zheng
Keyword(s):  
Electronic Properties ◽  
Organic Semiconductors ◽  
Near Infrared ◽  
Recent Advances ◽  
Infrared Photodiodes ◽  
Organic Photodetectors

Both broadband and narrowband organic photodetectors can be realized due to the easily tunable optical/electronic properties of organic semiconductors.

Continuous Droplet Flow Synthesis of a Near-Infrared Responsive Push–Pull Copolymer toward Large Scale Implementation of Organic Photodetectors

2020 ◽  
Vol 2 (11) ◽  
pp. 4373-4378
Author(s):  
Omar Beckers ◽  
Sam Gielen ◽  
Frederik Verstraeten ◽  
Pieter Verstappen ◽  
Laurence Lutsen ◽  
...  
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Flow Synthesis ◽  
Droplet Flow ◽  
Organic Photodetectors

Improved Dark Current Properties in Bi-Layer Structured Organic Photodetectors

2013 ◽  
Vol 650 ◽  
pp. 54-57 ◽  
Author(s):  
Naoki Ohtani ◽  
Shouta Majima
Keyword(s):  
Dark Current ◽  
Near Infrared ◽  
Layer Structure ◽  
Wide Bandgap ◽  
Electron Blocking Layer ◽  
Wet Process ◽  
Optical Sensitivity ◽  
Nir Absorption ◽  
Communication Devices ◽  
Organic Photodetectors

Organic photodiodes operating in the near-infrared (NIR) region with an operating wavelength of about 850 nm, which corresponds to GaAs-based optical devices, were fabricated by wet process. In the active layer, Copper(II)5,9,14,18,23,27,32,36-octabutoxy-2,3-naphthalocyanine was used as NIR absorption material. A wide-bandgap polymer was doped to decrease the dark current, and an n-type organic semiconductor was doped to increase optical sensitivity. To decrease the dark current further, an electron-blocking layer was added onto the anode. This bi-layer structure was found to be very useful for decreasing the dark current. We also evaluated the on/off ratio, which is very important for application to optical communication devices.

scholarly journals Near-infrared organic photodetectors based on bay-annulated indigo showing broadband absorption and high detectivities up to 1.1 μm

2018 ◽  
Vol 6 (43) ◽  
pp. 11645-11650 ◽  
Author(s):  
Frederik Verstraeten ◽  
Sam Gielen ◽  
Pieter Verstappen ◽  
Jurgen Kesters ◽  
Epimitheas Georgitzikis ◽  
...  
Keyword(s):  
Near Infrared ◽  
Broadband Absorption ◽  
Organic Photodetectors ◽  
Dark Currents

Organic photodetectors made from a BAI-based near-infrared copolymer reach high detectivities of 1012 Jones and low dark currents of 10−7 A cm−2.

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