scholarly journals High-performance near-infrared Schottky-photodetector based graphene/In2S3 van der Waals heterostructures

RSC Advances ◽  
2020 ◽  
Vol 10 (40) ◽  
pp. 23662-23667
Author(s):  
Long Chen ◽  
Zhenghan Li ◽  
Chaoyi Yan
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Performance ◽  
Near Infrared ◽  
Van Der Waals ◽  
Van Der Waals Heterostructures ◽  
Carrier Separation

The photodetectors based on graphene/In2S3 van der Waals heterostructures through junction carrier separation exhibited an excellent infrared performance of high photoresponsivity of 0.49 mA W−1, external quantum efficiency of 0.07%, and detectivity of 3.05 × 107 jones using an 808 nm laser.

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.

Layer-dependent photocatalysts of GaN/SiC-based multilayer van der Waals heterojunctions for Hydrogen Evolution

2021 ◽  
Author(s):  
Bojun Peng ◽  
Liang Xu ◽  
Jian Zeng ◽  
Xiaopeng Qi ◽  
Youwen Yang ◽  
...  
Keyword(s):  
Band Gap ◽  
Hydrogen Evolution ◽  
High Performance ◽  
Van Der Waals ◽  
Environmentally Friendly ◽  
Wide Band ◽  
Two Dimensional ◽  
Wide Band Gap ◽  
Van Der Waals Heterostructures ◽  
Composite Photocatalysts

The development of non-precious, high-performance and environmentally friendly wide band gap semiconductor composite photocatalysts is highly desirable. Here we report two-dimensional (2D) GaN/SiC-based multilayer van der Waals heterostructures for hydrogen...

Air-processed stable near-infrared Si-based perovskite light-emitting devices with efficiency exceeding 7.5%

2022 ◽  
Author(s):  
Xiaoxiao Xu ◽  
Ke Xiao ◽  
Guozhi Hou ◽  
Yu Zhu ◽  
Ting Zhu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Near Infrared ◽  
Ambient Air ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Composite Layers

Two composite layers are used to enhance the efficiency of Si-based near-infrared perovskite light-emitting devices, which are produced in ambient air, and the external quantum efficiency increased to 7.5%.

scholarly journals Record High External Quantum Efficiency of 19.2% Achieved in Light-Emitting Diodes of Colloidal Quantum Wells Enabled by Hot-Injection Shell Growth

2019 ◽  
Author(s):  
Baiquan Liu ◽  
Yemliha Altintas ◽  
Lin Wang ◽  
Sushant Shendre ◽  
Manoj Sharma ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Performance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Shell Growth ◽  
Light Emitting ◽  
Hot Injection ◽  
Key Factor

<p> Colloidal quantum wells (CQWs) are regarded as a new, highly promising class of optoelectronic materials thanks to their unique excitonic characteristics of high extinction coefficient and ultranarrow emission bandwidth. Although the exploration of CQWs in light-emitting diodes (LEDs) is impressive, the performance of CQW-LEDs lags far behind compared with other types of LEDs (e.g., organic LEDs, colloidal quantum-dot LEDs, and perovskite LEDs). Herein, for the first time, the authors show high-efficiency CQW-LEDs reaching close to the theoretical limit. A key factor for this high performance is the exploitation of hot-injection shell (HIS) growth of CQWs, which enables a near-unity photoluminescence quantum yield (PLQY), reduces nonradiative channels, ensures smooth films and enhances the stability. Remarkably, the PLQY remains 95% in solution and 87% in film despite rigorous cleaning. Through systematically understanding their shape-, composition- and device- engineering, the CQW-LEDs using CdSe/Cd<sub>0.25</sub>Zn<sub>0.75</sub>S core/HIS CQWs exhibit a maximum external quantum efficiency of 19.2%. Additionally, a high luminance of 23,490 cd m<sup>-2</sup>, extremely saturated red color with the Commission Internationale de L’Eclairage coordinates of (0.715, 0.283) and stable emission are obtained. The findings indicate that HIS grown CQWs enable high-performance solution-processed LEDs, which may pave the path for CQW-based display and lighting technologies.</p>

High-performance narrow spectrum green phosphorescent top-emitting organic light-emitting devices with external quantum efficiency up to 38%

2021 ◽  
Author(s):  
Xiaokang Li ◽  
Wenxing Liu ◽  
Kai Chen ◽  
Ruixia Wu ◽  
Guo-Jun Liu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Performance ◽  
Cavity Length ◽  
Strong Dependence ◽  
Emission Peak ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Organic Light ◽  
Micro Cavity

Abstract In this work, we have experimentally demonstrated the efficacy of micro-cavity effect in realizing high-performance top-emitting organic light-emitting diodes (TEOLEDs). By optimizing the thickness of top Yb/Ag electrode and cavity length, highly efficient green TEOLED with external quantum efficiency as high as 38% was achieved. A strong dependence of electroluminescent (EL) performances and spectrum on cavity length was observed, and there was also a significant angle dependence of EL spectrum. Ultimately, ultra-high current efficiency up to 161.17 cd/A (3.2 V) was obtained by the device with emission peak at 552 nm, which is 35 nm longer than the intrinsic emission peak (517 nm) of utilized green emitter. Interestingly, this device displayed narrow emission with full-width at half-maximum (FWHM) of less than 20 nm, which was obtained by increasing the Ag layer thickness.

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