The Theory Investigation of the Effect of Substitutions of –CF3 on the Properties of Ru Complex with Phenanthroline

2012 ◽  
Vol 554-556 ◽  
pp. 1700-1704
Author(s):  
Liang Rong Zhao ◽  
Rong Rong Zhang ◽  
Shuang Mei Gong ◽  
Xiao Bo Li ◽  
Chang Ying Yang
Keyword(s):  
Electron Transport ◽  
Optoelectronic Devices ◽  
Hole Transport ◽  
Complex Stability ◽  
Regular Octahedron ◽  
Ru Complex ◽  
Homo And Lumo ◽  
Trigonal Pyramid ◽  
Reorganization Energies ◽  
Complex Forms

The Ru(phen)32+ complex forms a regular octahedron and the Ru(phen)3 unit is a nearly regular trigonal pyramid with ~90° angles. Lengths between Ru and six nitrogen atoms showed slightly different, and rather insensitive to –CF3 group substituted, as well as the oxidation. There is manifest influence of perfluoro group substitutions on the HOMO and LUMO energies and the substitution of –CF3 enhances the electron-transport abilities, as well as the complex stability. By substitution of –CF3 group show increased λ, with addition one –CF3, a.u 0.02~0.03 ev increase consequently, indicating that the –CF3 in ligand will hinder hole transport. But, the reorganization energies for these complexes are really values compared with other materials for optoelectronic devices.

Efficient blue-green molecular organic light emitting diodes based on novel silole derivatives

2002 ◽  
Vol 725 ◽  
Author(s):  
Leonidas C. Palilis ◽  
Hideyuki Murata ◽  
Antti J. Mäkinen ◽  
Manabu Uchida ◽  
Zakya H. Kafafia
Keyword(s):  
Electron Transport ◽  
Quantum Efficiency ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Organic Light Emitting Diodes ◽  
Operating Voltage ◽  
High Electron ◽  
Blue Fluorescence ◽  
Light Emitting ◽  
Organic Light

AbstractWe report on highly efficient molecular organic light-emitting diodes (MOLEDs) using two novel silole derivatives as emissive and electron transport materials. A silole derivative, namely 2,5-di-(3-biphenyl)-1,1-dimethyl-3,4-diphenylsilacyclopentadiene (PPSPP), which shows blue fluorescence with a high photoluminescence quantum yield of 85% in the solid state, was used as the emissive material. Another silole derivative, namely 2,5-bis-(2‘2“-bipyridin-6-yl)-1,1- dimethyl-3,4-diphenylsilacyclopentadiene (PyPySPyPy), that exhibits a non-dispersive high electron mobility of 2x10-4 cm2/Vsec was used as the electron transport material. MOLEDs using these two siloles and a common hole transport material show blue-green emission centered at 495 nm. This red-shifted electroluminescence (EL) band relative to the blue fluorescence of PPSPP is assigned to a PPSPP:NPB exciplex. A low operating voltage of 4.5 V was measured at a luminance of 100 cd/m2 and an EL quantum efficiency of 3.4% was achieved at 100 A/m2. To our knowledge, this is the highest EL quantum efficiency ever reported based on exciplex emission.

Interface engineering using a perovskite derivative phase for efficient and stable CsPbBr3 solar cells

2018 ◽  
Vol 6 (29) ◽  
pp. 14255-14261 ◽  
Author(s):  
Huan Li ◽  
Guoqing Tong ◽  
Taotao Chen ◽  
Hanwen Zhu ◽  
Guopeng Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Energy Barrier ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Hole Transport Layer ◽  
Interface Engineering ◽  
Interface Defects

A derivative-phase CsPb2Br5 is introduced into inorganic perovskite solar cells, which will effectively eliminate interface defects, lower the energy barrier of electron transport layer and suppress the recombination at the interface of hole transport layer in the devices.

scholarly journals Recent Progress in Carbon-Based Buffer Layers for Polymer Solar Cells

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1858 ◽  
Author(s):  
Nguyen ◽  
Nguyen ◽  
Nguyen ◽  
Le ◽  
Vo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Electron Transport ◽  
Carbon Nitride ◽  
High Efficiency ◽  
Polymer Solar Cells ◽  
Optoelectronic Devices ◽  
Carbon Quantum Dots ◽  
Buffer Layers ◽  
Future Directions ◽  
Carbon Based

Carbon-based materials are promising candidates as charge transport layers in various optoelectronic devices and have been applied to enhance the performance and stability of such devices. In this paper, we provide an overview of the most contemporary strategies that use carbon-based materials including graphene, graphene oxide, carbon nanotubes, carbon quantum dots, and graphitic carbon nitride as buffer layers in polymer solar cells (PSCs). The crucial parameters that regulate the performance of carbon-based buffer layers are highlighted and discussed in detail. Furthermore, the performances of recently developed carbon-based materials as hole and electron transport layers in PSCs compared with those of commercially available hole/electron transport layers are evaluated. Finally, we elaborate on the remaining challenges and future directions for the development of carbon-based buffer layers to achieve high-efficiency and high-stability PSCs.

Optimizing the central steric hindrance of cross-linkable hole transport materials for achieving highly efficient RGB QLEDs

2020 ◽  
Vol 4 (11) ◽  
pp. 3368-3377
Author(s):  
Wenchao Zhao ◽  
Liming Xie ◽  
Yuan-Qiu-Qiang Yi ◽  
Xiaolian Chen ◽  
Jianfeng Hu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Steric Hindrance ◽  
Optoelectronic Devices ◽  
Hole Transport ◽  
Cross Linking ◽  
Solvent Resistance ◽  
Highly Efficient

Cross-linking strategies of hole transport materials (HTMs) have been widely investigated and used in various optoelectronic devices, mainly owing to their excellent solvent resistance and thermal stability.

High luminance of CuInS2-based yellow quantum dot light emitting diodes fabricated by all-solution processing

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72462-72470 ◽  
Author(s):  
Jingling Li ◽  
Hu Jin ◽  
Kelai Wang ◽  
Dehui Xie ◽  
Dehua Xu ◽  
...  
Keyword(s):  
Electron Transport ◽  
Quantum Dot ◽  
Zno Nanoparticles ◽  
Light Emitting Diodes ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer ◽  
Hole Transport Layer ◽  
High Luminance ◽  
Light Emitting

In this work, all-solution processed, multi-layer yellow QLEDs, consisting of a hole transport layer of poly(9-vinylcarbazole), emissive layer of ligand exchanged CuInS2/ZnS QDs, and electron transport layer of ZnO nanoparticles, are fabricated.

Electroluminescent Diodes Using Cyclohexane-Based Glass Forming Liquid Crystals and Their Analogues

1996 ◽  
Vol 425 ◽  
Author(s):  
C. P. Lin ◽  
T. Tsutsui ◽  
S. Saito ◽  
S. H. Chen ◽  
J. C. Mastrangelo ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electron Transport ◽  
Charge Transport ◽  
Single Layer ◽  
Hole Transport ◽  
Device Performance ◽  
Glass Forming ◽  
Two Component ◽  
Organic Electroluminescent ◽  
Transport Molecules

AbstractOrganic electroluminescent(EL) diodes using spin-coat films of cyclohexane-based glass-forming liquid crystal (LC) materials were fabricated. The cyclohexane-based LC materials were found to be useful for EL diodes. Blending the LC materials with charge transport molecules was found to be a promising method for improving device performance. Conventional hole transport and electron transport molecules were found to show a tendency to form exciplexes with cyclohexanebased LC materials. This difficulty was overcome by the introduction of cyclohexane-based charge transport molecules. The EL quantum efficiency of 0.06% was attained in the single-layer devices with two-component blends.

scholarly journals Numerical simulation of perovskite solar cell with different material as electron transport layer using SCAPS-1D Software

2021 ◽  
Vol 24 (3) ◽  
pp. 341-347
Author(s):  
K. Bhavsar ◽  
◽  
P.B. Lapsiwala ◽  
Keyword(s):  
Numerical Simulation ◽  
Solar Cells ◽  
Solar Cell ◽  
Electron Transport ◽  
Perovskite Solar Cells ◽  
Acid Methyl Ester ◽  
Perovskite Solar Cell ◽  
Hole Transport ◽  
Transport Layer ◽  
Electron Transport Layer

Perovskite solar cells have become a hot topic in the solar energy device area due to high efficiency and low cost photovoltaic technology. However, their function is limited by expensive hole transport material (HTM) and high temperature process electron transport material (ETM) layer is common device structure. Numerical simulation is a crucial technique in deeply understanding the operational mechanisms of solar cells and structure optimization for different devices. In this paper, device modelling for different perovskite solar cell has been performed for different ETM layer, namely: TiO2, ZnO, SnO2, PCBM (phenyl-C61-butyric acid methyl ester), CdZnS, C60, IGZO (indium gallium zinc oxide), WS2 and CdS and effect of band gap upon the power conversion efficiency of device as well as effect of absorber thickness have been examined. The SCAPS 1D (Solar Cell Capacitance Simulator) has been a tool used for numerical simulation of these devices.

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