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.

Optical Expediency of Back Electrode Materials for Organic Near-Infrared Photodiodes

2021 ◽  
Author(s):  
Nora Schopp ◽  
Thuc-Quyen Nguyen ◽  
Viktor V. Brus
Keyword(s):  
Near Infrared ◽  
Electrode Materials ◽  
Infrared Photodiodes

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.

Zooming into the complex dusty envelopes of C-rich AGB stars

2018 ◽  
Vol 14 (S343) ◽  
pp. 456-457
Author(s):  
Foteini Lykou ◽  
Josef Hron ◽  
Daniela Klotz
Keyword(s):  
Temperature Distribution ◽  
Near Infrared ◽  
Angular Resolution ◽  
High Angular Resolution ◽  
Dust Formation ◽  
Agb Stars ◽  
Circumstellar Envelopes ◽  
Recent Advances ◽  
Multi Wavelength

AbstractRecent advances in high-angular resolution instruments (VLT and VLTI, ALMA) have enabled us to delve deep into the circumstellar envelopes of AGB stars from the optical to the sub-mm wavelengths, thus allowing us to study in detail the gas and dust formation zones (e.g., their geometry, chemistry and kinematics). This work focuses on four (4) C-rich AGB stars observed with a high-angular resolution technique in the near-infrared: a multi-wavelength tomographic study of the dusty layers of the circumstellar envelopes of these C-rich stars, i.e. the variations in the morphology and temperature distribution.

Growth direction dependent separate-channel charge transport in organic weak charge-transfer co-crystal of anthracene-DTTCNQ

2022 ◽  
Author(s):  
Hui Jiang ◽  
Jun Ye ◽  
Peng Hu ◽  
Shengli Zhu ◽  
Yanqin Liang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Charge Transport ◽  
Electronic Properties ◽  
Single Crystals ◽  
Organic Semiconductors ◽  
Crystal Engineering ◽  
Molecular Crystal ◽  
Growth Direction ◽  
Weak Charge ◽  
Separate Channel

Co-crystallization is an efficient way of molecular crystal engineering to tune the electronic properties of organic semiconductors. In this work, we synthesized anthracene-4,8-bis(dicyanomethylene)4,8-dihydrobenzo[1,2-b:4,5-b’]-dithiophene (DTTCNQ) single crystals as a template to...

Recent Advances in the Synthesis of Polyfluorenes as Organic Semiconductors

2004 ◽  
Vol 814 ◽  
Author(s):  
David J. Brennan ◽  
Yu Chen ◽  
Shaoguang Feng ◽  
James P. Godschalx ◽  
Gary E. Spilman ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Semiconductor Film ◽  
Melting Temperatures ◽  
Alternating Copolymers ◽  
Polymeric Semiconductor ◽  
Recent Advances ◽  
Thermal Cleavage ◽  
Switching Characteristics ◽  
Initial Results ◽  
Bottom Gate

AbstractNew poly(fluorene-thiophene) alternating copolymers are described in which either the dioctylfluorene or bithiophene units in poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) are replaced by other fluorene or thiophene-based groups, respectively. Improvements in solubility are realized when the bithiophene unit of F8T2 is replaced by dihexylterthiophene or dihexylpentathiophene units. Melting temperatures are also lowered by 50 – 100°C in these polymers when compared to F8T2. Replacement of the bithiophene unit of F8T2 with a dihexylpentathiophene unit also results in a significant improvement in hysteresis (< 2 V vs. 3.5 – 5 V for F8T2). Initial results are also reported on the thermal cleavage of the C8 side groups of F8T2, which yields an insoluble polymeric semiconductor film that continues to exhibit transistor switching characteristics as part of a bottom gate device.

Recent Advances in the Computational Characterization of π-Conjugated Organic Semiconductors

2019 ◽  
pp. 37-106
Author(s):  
Jean-Luc Bredas ◽  
Xiankai Chen ◽  
Thomas Körzdörfer ◽  
Hong Li ◽  
Chad Risko ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Recent Advances ◽  
Conjugated Organic Semiconductors

scholarly journals Recent Advances and Applications of Near Infrared Spectroscopy for Honey Quality Assessment

2014 ◽  
Vol 6 (4) ◽  
pp. 461-467 ◽  
Author(s):  
Guiyun Chen ◽  
Yuping Huang ◽  
Kunjie Chen
Keyword(s):  
Infrared Spectroscopy ◽  
Quality Assessment ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Recent Advances
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