New Ambipolar Organic Semiconductors. 2. Effects of Electron Acceptor Strength on Intramolecular Charge Transfer Photophysics, Highly Efficient Electroluminescence, and Field-Effect Charge Transport of Phenoxazine-Based Donor−Acceptor Materials

2008 ◽  
Vol 20 (13) ◽  
pp. 4212-4223 ◽  
Author(s):  
Abhishek P. Kulkarni ◽  
Yan Zhu ◽  
Amit Babel ◽  
Pei-Tzu Wu ◽  
Samson A. Jenekhe
Keyword(s):  
Charge Transfer ◽  
Charge Transport ◽  
Organic Semiconductors ◽  
Electron Acceptor ◽  
Field Effect ◽  
Intramolecular Charge Transfer ◽  
Highly Efficient ◽  
Donor Acceptor

scholarly journals A general design approach toward covalent organic frameworks for highly efficient electrochemiluminescence

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ya-Jie Li ◽  
Wei-Rong Cui ◽  
Qiao-Qiao Jiang ◽  
Qiong Wu ◽  
Ru-Ping Liang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
High Speed ◽  
Intramolecular Charge Transfer ◽  
High Sensitivity ◽  
Covalent Organic Frameworks ◽  
Transport Networks ◽  
Promising Direction ◽  
Highly Efficient ◽  
Donor And Acceptor ◽  
Donor Acceptor

AbstractElectrochemiluminescence (ECL) plays a key role in analysis and sensing because of its high sensitivity and low background. Its wide applications are however limited by a lack of highly tunable ECL luminophores. Here we develop a scalable method to design ECL emitters of covalent organic frameworks (COFs) in aqueous medium by simultaneously restricting the donor and acceptor to the COFs’ tight electron configurations and constructing high-speed charge transport networks through olefin linkages. This design allows efficient intramolecular charge transfer for strong ECL, and no exogenous poisonous co-reactants are needed. Olefin-linked donor-acceptor conjugated COFs, systematically synthesized by combining non-ECL active monomers with C2v or C3v symmetry, exhibit strong ECL signals, which can be boosted by increasing the chain length and conjugation of monomers. The present concept demonstrates that the highly efficient COF-based ECL luminophores can be precisely designed, providing a promising direction toward COF-based ECL phosphors.

scholarly journals Photo-induced intramolecular charge transfer in an ambipolar field-effect transistor based on a π-conjugated donor–acceptor dyad

2013 ◽  
Vol 1 (25) ◽  
pp. 3985 ◽  
Author(s):  
Raphael Pfattner ◽  
Egon Pavlica ◽  
Michael Jaggi ◽  
Shi-Xia Liu ◽  
Silvio Decurtins ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Intramolecular Charge Transfer ◽  
Donor Acceptor ◽  
Effect Transistor

Theoretical study on the charge transport and metallic conducting properties in organic complexes

2019 ◽  
Vol 21 (24) ◽  
pp. 13304-13318 ◽  
Author(s):  
Ya-Rui Shi ◽  
Yu-Fang Liu
Keyword(s):  
Charge Transfer ◽  
Electrical Properties ◽  
Charge Transport ◽  
Organic Semiconductors ◽  
Electron Acceptor ◽  
Transfer Process ◽  
Theoretical Study ◽  
Charge Transfer Process ◽  
Organic Complexes ◽  
Molecular Doping

The charge transfer process between substrate molecular and dopant always appears in doped organic semiconductors, so that molecular doping is a common method to improve the electrical properties by combining appropriate complexes of electron acceptor and donor molecules.

On Razors Edge: Influence of the Source Insulator Edge on the Charge Transport of Vertical Organic Field Effect Transistors

MRS Advances ◽  
2017 ◽  
Vol 2 (23) ◽  
pp. 1249-1257 ◽  
Author(s):  
F. Michael Sawatzki ◽  
Alrun A. Hauke ◽  
Duy Hai Doan ◽  
Peter Formanek ◽  
Daniel Kasemann ◽  
...  
Keyword(s):  
Charge Transport ◽  
Organic Semiconductors ◽  
Organic Solar Cells ◽  
Field Effect ◽  
Field Effect Transistor ◽  
Field Effect Transistors ◽  
Electrical Power ◽  
Strong Impact ◽  
Organic Field Effect Transistor ◽  
Effect Transistor

ABSTRACTTo benefit from the many advantages of organic semiconductors like flexibility, transparency, and small thickness, electronic devices should be entirely made from organic materials. This means, additionally to organic LEDs, organic solar cells, and organic sensors, we need organic transistors to amplify, process, and control signals and electrical power. The standard lateral organic field effect transistor (OFET) does not offer the necessary performance for many of these applications. One promising candidate for solving this problem is the vertical organic field effect transistor (VOFET). In addition to the altered structure of the electrodes, the VOFET has one additional part compared to the OFET – the source-insulator. However, the influence of the used material, the size, and geometry of this insulator on the behavior of the transistor has not yet been examined. We investigate key-parameters of the VOFET with different source insulator materials and geometries. We also present transmission electron microscopy (TEM) images of the edge area. Additionally, we investigate the charge transport in such devices using drift-diffusion simulations and the concept of a vertical organic light emitting transistor (VOLET). The VOLET is a VOFET with an embedded OLED. It allows the tracking of the local current density by measuring the light intensity distribution.We show that the insulator material and thickness only have a small influence on the performance, while there is a strong impact by the insulator geometry – mainly the overlap of the insulator into the channel. By tuning this overlap, on/off-ratios of 9x105 without contact doping are possible.

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...

scholarly journals Tuning of Hyperpolarizability, One- and Two-Photon Absorption of D-A and D-A-A Type Intramolecular Charge Transfer Based Sensors

2019 ◽  
Author(s):  
Pralok K. Samanta ◽  
Md Mehboob Alam ◽  
Ramprasad Misra ◽  
Swapan K. Pati
Keyword(s):  
Charge Transfer ◽  
Gas Phase ◽  
Density Functional ◽  
Intramolecular Charge Transfer ◽  
Photon Absorption ◽  
First Hyperpolarizability ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Nlo Response ◽  
Donor Acceptor

Solvents play an important role in shaping the intramolecular charge transfer (ICT) properties of π-conjugated molecules, which in turn can affect their one-photon absorption (OPA) and two-photon absorption (TPA) as well as the static (hyper)polarizabilities. Here, we study the effect of solvent and donor-acceptor arrangement on linear and nonlinear optical (NLO) response properties of two novel ICT-based fluorescent sensors, one consisting of hemicyanine and dimethylaniline as electron withdrawing and donating groups (molecule 1), respectively and its boron-dipyrromethene (BODIPY, molecule 2)-fused counterpart (molecule 3). Density functional theoretical (DFT) calculations using long-range corrected CAM-B3LYP and M06-2X functionals, suitable for studying properties of ICT molecules, are employed to calculate the desired properties. The dipole moment (µ) as well as the total first hyperpolarizability (β<sub>total</sub>) of the studied molecules in the gas phase is dominantly dictated by the component in the direction of charge transfer. The ratios of vector component of first hyperpolarizability (β<sub>vec</sub>) to β<sub>total</sub> also reveal unidirectional charge transfer process. The properties of the medium significantly affect the OPA, hyperpolarizability and TPA properties of the studied molecules. Time dependent DFT (TDDFT) calculations suggest interchanging between two lowest excited states of molecule 3 from the gas phase to salvation. The direction of charge polarization and dominant transitions among molecular orbitals involved in the OPA and TPA processes are studied. The results presented are expected to be useful in tuning the NLO response of many ICT-based chromophores, especially those with BODIPY acceptors.<br>

scholarly journals Molecular dynamics and charge transport in organic semiconductors: a classical approach to modeling electron transfer

2017 ◽  
Vol 8 (4) ◽  
pp. 2597-2609 ◽  
Author(s):  
Kenley M. Pelzer ◽  
Álvaro Vázquez-Mayagoitia ◽  
Laura E. Ratcliff ◽  
Sergei Tretiak ◽  
Raymond A. Bair ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Electron Transfer ◽  
Charge Transfer ◽  
Charge Transport ◽  
Ab Initio ◽  
Organic Semiconductors ◽  
Multiscale Approach ◽  
Classical Approach ◽  
Classical Molecular Dynamics

Using ab initio calculations of charges in PCBM fullerenes, a multiscale approach applies classical molecular dynamics to model charge transfer.

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