Thermal Behavior of Mixed-Stack Charge Transfer Films of 2-Octadecyl-7,7,8,8-tetracyanoquinodimethane and 3,3‘,5,5‘-Tetramethylbenzidine Prepared by the Langmuir−Blodgett Technique and Donor Doping. 1. Dependence of Thermal Behavior on the Number of Layers Studied by Ultraviolet−Visible−Near Infrared and Infrared Spectroscopies

1996 ◽  
Vol 100 (43) ◽  
pp. 17232-17237 ◽  
Author(s):  
Yan Wang ◽  
Katsuhiro Nichogi ◽  
Keiji Iriyama ◽  
Yukihiro Ozaki
Keyword(s):  
Charge Transfer ◽  
Thermal Behavior ◽  
Near Infrared ◽  
Langmuir Blodgett ◽  
Donor Doping ◽  
Number Of Layers ◽  
Transfer Films

Mixed-stack charge-transfer films prepared by Langmuir-Blodgett technique and donor doping

1995 ◽  
Vol 254 (1-2) ◽  
pp. 240-245 ◽  
Author(s):  
Katsuhiro Nichogi ◽  
Akira Taomoto ◽  
Taro Nambu ◽  
Mutsuaki Murakami
Keyword(s):  
Charge Transfer ◽  
Langmuir Blodgett ◽  
Donor Doping ◽  
Transfer Films

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.

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