- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - The Seebeck Coefficient for Disordered Organic Semiconductors
摘要： The Seebeck coefficient is used to describe the transport of carriers and sensitive to the shape of density of state. However, the density of state in organic semiconductors is unclear at present. Some researches incline to apply the Gaussian or exponential density of state. In this paper, we propose an exponential-type density of state with clearly cutting tail at same place. Based on the Miller-Abrahams hopping model, we calculate the variation of initial energy and escape energy for different temperature, analysis the dependence of the conductivity to Seebeck coefficient, and compare the influence of (cid:1) and energetic disorder to the Seebeck coefficient in different temperature by exponential-type DOS (EC DOS) cutting tails at some place.
关键词： density of state,Seebeck coefficient,organic semiconductors,exponential-type DOS,Miller-Abrahams hopping model
更新于2025-09-09 09:28:46
-
Imide‐Functionalized Polymer Semiconductors
摘要： Imide-functionalized p-conjugated polymer semiconductors have received a great deal of interest owing to their unique physicochemical properties and optoelectronic characteristics, including excellent solubility, highly planar backbones, widely tunable band gaps and energy levels of frontier molecular orbitals, and good film morphology. The organic electronics community has witnessed rapid expansion of the materials library and remarkable improvement in device performance recently. This review summarizes the development of imide-functionalized polymer semiconductors as well as their device performance in organic thin-film transistors and polymer solar cells, mainly achieved in the past three years. The materials mainly cover naphthalene diimide, perylene diimide, and bithiophene imide, and other imide-based polymer semiconductors are also discussed. The perspective offers our insights for developing new imide-functionalized building blocks and polymer semiconductors with optimized optoelectronic properties. We hope that this review will generate more research interest in the community to realize further improved device performance by developing new imide-functionalized polymer semiconductors.
关键词： organic thin-film transistors,imide-functionalized polymers,organic semiconductors,solar cells
更新于2025-09-04 15:30:14
-
Semiconducting polymer blends that exhibit stable charge transport at high temperatures
摘要： Although high-temperature operation (i.e., beyond 150°C) is of great interest for many electronics applications, achieving stable carrier mobilities for organic semiconductors at elevated temperatures is fundamentally challenging. We report a general strategy to make thermally stable high-temperature semiconducting polymer blends, composed of interpenetrating semicrystalline conjugated polymers and high glass-transition temperature insulating matrices. When properly engineered, such polymer blends display a temperature-insensitive charge transport behavior with hole mobility exceeding 2.0 cm2/V·s across a wide temperature range from room temperature up to 220°C in thin-film transistors.
关键词： semiconducting polymer blends,charge transport,thermal stability,high-temperature operation,organic semiconductors
更新于2025-09-04 15:30:14
-
Tuning effective hyperfine fields in PEDOT:PSS thin films by doping
摘要： Using electrically detected magnetic resonance spectroscopy, we demonstrate that doping the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) with ethylene glycol allows for the control of effective local charge carrier hyperfine fields through motional narrowing. These results suggest that doping of organic semiconductors could enable the tuning of macroscopic material properties dependent on hyperfine fields such as magnetoresistance, magneto-optical responses, and spin diffusion.
关键词： organic semiconductors,spin diffusion,motional narrowing,hyperfine fields,PEDOT:PSS
更新于2025-09-04 15:30:14
-
Creation of Photoactive Inorganic/Organic Interfaces Using Occlusion Electrodeposition Process of Inorganic Nanoparticles During Electropolymerization of 2,2′:5′,2′′-Terthiophene
摘要： Photoactive (IOI) inorganic/organic interface assemblies were prepared using an occlusion electrodeposition method. Poly-2,2′:5′,2′′-Terthiophene (PTTh) were the organic thin films that occluded each of CdS, TiO2, and Zn-doped WO3 nanoparticles. The energy band gap structures were investigated using spectroscopic and electrochemical techniques. The obtained assemblies were investigated in aqueous solutions under both dark and illuminated conditions. The results were compared with the behavior of PTTh thin film. Oxygen played an important role in minimizing electron/hole recombination as was evident by observed very low photocurrent when oxygen was removed by nitrogen purge. Results show that PTTh/CdS gave the greatest photocurrent, followed by PTTh/Zn-WO3 and PTTh/TiO2.
关键词： Occlusion,Interface,Organic semiconductors,Photoelectrochemistry,Inorganic
更新于2025-09-04 15:30:14
-
Quantitative mobility evaluation of organic semiconductors using quantum dynamics based on density functional theory
摘要： We present an order-N methodology to evaluate mobilities of charge carriers coupled with molecular vibrations using quantum dynamics based on first-principles calculations that can be applied to micron-scale soft materials. As a demonstration, we apply it to several organic semiconductors and show that the calculated intrinsic hole mobilities and their temperature dependences are quantitatively in good agreement with those obtained in experiments. We also clarified which vibrational modes dominate the transport properties. The methodology paves the way for quantitative prediction of the transport properties of various soft materials.
关键词： quantum dynamics,density functional theory,charge-carrier mobility,organic semiconductors,molecular vibrations
更新于2025-09-04 15:30:14
-
Machine Learning-Based Charge Transport Computation for Pentacene
摘要： Insight into the relation between morphology and transport properties of organic semiconductors can be gained using multiscale simulations. Since computing electronic properties, such as the intermolecular transfer integral, using quantum chemical (QC) methods requires a high computational cost, existing models assume several approximations. A machine learning (ML)–based multiscale approach is presented that allows to simulate charge transport in organic semiconductors considering the static disorder within disordered crystals. By mapping ?ngerprints of dimers to their respective transfer integral, a kernel ridge regression ML algorithm for the prediction of charge transfer integrals is trained and evaluated. Since QC calculations of the electronic structure must be performed only once, the use of ML reduces the computation time radically, while maintaining the prediction error small. Transfer integrals predicted by ML are utilized for the computation of charge carrier mobilities using o?-lattice kinetic Monte Carlo (kMC) simulations. Bene?ting from the rapid performance of ML, microscopic processes can be described accurately without the need for phenomenological approximations. The multiscale system is tested with the well-known molecular semiconductor pentacene. The presented methodology allows reproducing the experimentally observed anisotropy of the mobility and enables a fast estimation of the impact of disorder.
关键词： machine learning,multiscale approach,organic semiconductors,charge transport,pentacene
更新于2025-09-04 15:30:14