scholarly journals Photomultiplication‐Type Organic Photodetectors for Near‐Infrared Sensing with High and Bias‐Independent Specific Detectivity

2022 ◽  
pp. 2105113
Author(s):  
Shen Xing ◽  
Jonas Kublitski ◽  
Christian Hänisch ◽  
Louis Conrad Winkler ◽  
Tian‐yi Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Sensing ◽  
Specific Detectivity ◽  
Organic Photodetectors

scholarly journals Reverse dark current in organic photodetectors and the major role of traps as source of noise

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jonas Kublitski ◽  
Andreas Hofacker ◽  
Bahman K. Boroujeni ◽  
Johannes Benduhn ◽  
Vasileios C. Nikolis ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Spectral Density ◽  
Dark Current ◽  
Near Infrared ◽  
Low Cost ◽  
Limiting Factor ◽  
Noise Spectral Density ◽  
Infrared Sensing ◽  
Donor Acceptor ◽  
Organic Photodetectors

AbstractOrganic photodetectors have promising applications in low-cost imaging, health monitoring and near-infrared sensing. Recent research on organic photodetectors based on donor–acceptor systems has resulted in narrow-band, flexible and biocompatible devices, of which the best reach external photovoltaic quantum efficiencies approaching 100%. However, the high noise spectral density of these devices limits their specific detectivity to around 1013 Jones in the visible and several orders of magnitude lower in the near-infrared, severely reducing performance. Here, we show that the shot noise, proportional to the dark current, dominates the noise spectral density, demanding a comprehensive understanding of the dark current. We demonstrate that, in addition to the intrinsic saturation current generated via charge-transfer states, dark current contains a major contribution from trap-assisted generated charges and decreases systematically with decreasing concentration of traps. By modeling the dark current of several donor–acceptor systems, we reveal the interplay between traps and charge-transfer states as source of dark current and show that traps dominate the generation processes, thus being the main limiting factor of organic photodetectors detectivity.

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.

Near-infrared sensing utilizing the evanescent field

1993 ◽  
Vol 281 (2) ◽  
pp. 265-270 ◽  
Author(s):  
A.R. Lennie ◽  
F. Kvasnik
Keyword(s):  
Near Infrared ◽  
Evanescent Field ◽  
Infrared Sensing

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

In-Helmet Oxy-hemoglobin Change Detection Using Near-Infrared Sensing

2009 ◽  
pp. 504-513
Author(s):  
Erin M. Nishimura ◽  
Christopher A. Russell ◽  
J. Patrick Stautzenberger ◽  
Harvey Ku ◽  
J. Hunter Downs
Keyword(s):  
Change Detection ◽  
Near Infrared ◽  
Infrared Sensing

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

scholarly journals Enhancing the tactile and near-infrared sensing capabilities of electrospun PVDF nanofibers with the use of gold nanocages

2018 ◽  
Vol 6 (38) ◽  
pp. 10263-10269 ◽  
Author(s):  
Haoxuan Li ◽  
Tong Wu ◽  
Minghao Xie ◽  
Yifeng Shi ◽  
Song Shen ◽  
...  
Keyword(s):  
Near Infrared ◽  
Infrared Sensing ◽  
Gold Nanocages

Gold nanocages are directly into PVDF nanofibers during electrospinning to greatly improve their performance in tactile and near-infrared sensing.

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