Relationship Between Thermoelectric Properties and Morphology of Doped P3HT Thin Films for Potential Thermoelectric Applications

MRS Advances ◽  
2019 ◽  
Vol 4 (30) ◽  
pp. 1727-1732
Author(s):  
Jonathan J. Montes ◽  
Harold O. Lee ◽  
Faniya C. Doswell ◽  
Sam-Shajing Sun
Keyword(s):  
Conjugated Polymers ◽  
Thermoelectric Properties ◽  
Lower Energy ◽  
Energy State ◽  
Low Cost ◽  
Optoelectronic Devices ◽  
Charge Carriers ◽  
Device Performance ◽  
Conjugated Materials ◽  
Improve Device

ABSTRACTPolymeric conjugated materials are very promising for developing future soft material-based semiconductors, conductors, electronic and optoelectronic devices due to their inherent advantages such as flexibility, low-cost, ease of processability, and decreased harmful waste. Like their inorganic counterparts, the addition of certain dopants can significantly alter the electronic and optoelectronic properties of the host conjugated polymers or composites allowing modification for a variety of electronic/optoelectronic applications. One way to improve device performance is through the process of thermal annealing. Annealing allows for polymer matrices to self-assemble into a lower energy state which typically leads to increased crystallinity and higher charge mobility. In this work, we plan to evaluate the effects of annealing on doped P3HT films to understand its effects on optoelectronic and electronic properties focusing solely on crystallinity and charge carriers. Further understanding of the connection between annealing and doping in polymeric conjugated materials and thermoelectric properties will allow for an increase net output from multi-function materials and devices.

The Effects of Annealing on Doped P3HT Thin Films for Potential Electronic Applications

MRS Advances ◽  
2019 ◽  
Vol 4 (31-32) ◽  
pp. 1787-1792
Author(s):  
Faniya C. Doswell ◽  
Harold O. Lee ◽  
Jonathan J. Montes ◽  
Sam-Shajing Sun
Keyword(s):  
Thin Films ◽  
Conjugated Polymers ◽  
Electronic Properties ◽  
Polymer Matrix ◽  
Lower Energy ◽  
Energy State ◽  
Optoelectronic Devices ◽  
Device Performance ◽  
Conjugated Materials ◽  
Improve Device

ABSTRACTPolymeric conjugated materials are convenient for developing future soft-material-based semiconductors, conductors, electronic and optoelectronic devices due to their inherent features. Similar to their inorganic counterparts, the addition of certain minority molecules, or dopants, to polymeric conjugated materials can significantly alter the electronic and optoelectronic properties of the host conjugated polymers or composites. This allows for tunability of a variety of electronic and optoelectronic applications. One way to improve device performance is through the process of thermal annealing. Annealing allows for a polymer matrix to self-assemble into a lower energy state, which leads to an increase in crystallinity and higher charge mobility. Previous research does not explicitly define how dopants can affect this process. This study involves an evaluation of the effects of annealing with doped P3HT films to demonstrate changes in optoelectronic and electronic properties.

TRANSITION OF BIPOLARON TO POLARONS INDUCED BY MAGNETIC IMPURITIES IN CONJUGATED POLYMERS

2011 ◽  
Vol 25 (12) ◽  
pp. 1601-1610
Author(s):  
X. J. LIU ◽  
Z. AN ◽  
S. J. XIE
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Dynamic Method ◽  
Optoelectronic Devices ◽  
Charge Carriers ◽  
Composite Particles ◽  
Magnetic Impurities ◽  
Internal Structures ◽  
Spin Polarized ◽  
Pass Through

Both polarons and bipolarons are composite particles with internal structures in nondegenerate conjugated polymers. A bipolaron is a spinless species with charge ±2|e|, while a polaron is a spin-bearing one (spin 1/2, charge ±|e|). Serving as charge carriers, they play an important role in the transport properties of polymer-based optoelectronic devices. By using a nonadiabatic dynamic method, the motion of a bipolaron under an external electric field is theoretically investigated in a conjugated polymer with magnetic impurities. Our results show that a bipolaron can pass through the magnetic impurities, or break down into two polarons with different spins, or be trapped by the magnetic impurities, depending on the width of the impurity region. When the width of the impurity region is comparable to the polaron width, the bipolaron is transformed into two polarons easily. As a polaron and a bipolaron possess different spin characteristics, the decomposition of bipolarons induced by the magnetic impurities may have important effect on the spin polarized transportation.

Optoelectronic Properties and Structural Modification of Conjugated Polymers Based on Benzodithiophene Groups

2019 ◽  
Vol 16 (3) ◽  
pp. 253-260 ◽  
Author(s):  
Jieyun Wu ◽  
Qing Li ◽  
Wen Wang ◽  
Kaixin Chen
Keyword(s):  
Conjugated Polymers ◽  
Molecular Design ◽  
Field Effect Transistors ◽  
Polymer Solar Cells ◽  
Optoelectronic Devices ◽  
Optoelectronic Properties ◽  
Two Dimensional ◽  
Structure Property ◽  
Conjugated Materials ◽  
Organic Optoelectronic

Organic conjugated materials have shown attractive applications due to their good optoelectronic properties, which enable them solution processing techniques in organic optoelectronic devices. Many conjugated materials have been investigated in polymer solar cells and organic field-effect transistors. Among those conjugated materials, Benzo[1,2-b:4,5-b′]dithiophene (BDT) is one of the most employed fused-ring building groups for the synthesis of conjugated materials. The symmetric and planar conjugated structure, tight and regular stacking of BDT can be expected to exhibit the excellent carrier transfer for optoelectronics. In this review, we summarize the recent progress of BDT-based conjugated polymers in optoelectronic devices. BDT-based conjugated materials are classified into onedimensional (1D) and two-dimensional (2D) BDT-based conjugated polymers. Firstly, we introduce the fundamental information of BDT-based conjugated materials and their application in optoelectronic devices. Secondly, the design and synthesis of alkyl, alkoxy and aryl-substituted BDT-based conjugated polymers are discussed, which enables the construction of one-dimensional and two-dimensional BDTbased conjugated system. In the third part, the structure modification, energy level tuning and morphology control and their influences on optoelectronic properties are discussed in detail to reveal the structure- property relationship. Overall, we hope this review can be a good reference for the molecular design of BDT-based semiconductor materials in optoelectronic devices.

scholarly journals Effect of Side Chain Substituent Volume on Thermoelectric Properties of IDT-Based Conjugated Polymers

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 963
Author(s):  
De-Xun Xie ◽  
Tong-Chao Liu ◽  
Jing Xiao ◽  
Jing-Kun Fang ◽  
Cheng-Jun Pan ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Thermoelectric Properties ◽  
Conjugated Polymer ◽  
High Performance ◽  
Charge Carriers ◽  
Side Chain ◽  
Side Chains ◽  
Bulky Substituent ◽  
P Type

A p-type thermoelectric conjugated polymer based on indacenodithiophene and benzothiadiazole is designed and synthesized by replacing normal aliphatic side chains (P1) with conjugated aromatic benzene substituents (P2). The introduced bulky substituent on P2 is detrimental to form the intensified packing of polymers, therefore, it hinders the efficient transporting of the charge carriers, eventually resulting in a lower conductivity compared to that of the polymers bearing aliphatic side chains (P1). These results reveal that the modification of side chains on conjugated polymers is crucial to rationally designed thermoelectric polymers with high performance.

A Novel High-Stress Pre-Metal Dielectric Film to Improve Device Performance for sub-65nm CMOS Manufacturing

2006 ◽  
Vol 913 ◽  
Author(s):  
Young Way Teh ◽  
John Sudijono ◽  
Alok Jain ◽  
Shankar Venkataraman ◽  
Sunder Thirupapuliyur ◽  
...  
Keyword(s):  
Performance Improvement ◽  
Dielectric Film ◽  
High Stress ◽  
Significant Degree ◽  
Strain Effect ◽  
Device Performance ◽  
Hot Carrier ◽  
Tcad Simulation ◽  
Improve Device ◽  
Deposition Techniques

AbstractThis work focuses on the development and physical characteristics of a novel dielectric film for a pre-metal dielectric (PMD) application which induces a significant degree of tensile stress in the channel of a sub-65nm node CMOS structure. The film can be deposited at low temperatures to meet the requirements of NiSi integration while maintaining void-free gap fill and superior film quality such as moisture content and uniformity. A manufacturable and highly reliable oxide film has been demonstrated through both TCAD simulation and real device data, showing ~6% NMOS Ion-Ioff improvement; no Ion-Ioff improvement or degradation on PMOS. A new concept has been proposed to explain the PMD strain effect on device performance improvement. Improvement in Hot Carrier immunity is observed compared to similar existing technologies using high density plasma (HDP) deposition techniques.

scholarly journals Microstructure and Thermoelectric Properties of (Bi0.48Sb1.52)Te3 Thick Films Prepared with Tape Casting Method

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 140
Author(s):  
Lichen Liu ◽  
Ziping Cao ◽  
Min Chen ◽  
Jun Jiang
Keyword(s):  
Thermoelectric Properties ◽  
Low Cost ◽  
Thick Films ◽  
Tape Casting ◽  
Casting Process ◽  
Casting Method ◽  
Glass Substrates ◽  
Conductive Films ◽  
Casting Technology

This paper reports the fabrication and characterization of (Bi0.48Sb1.52)Te3 thick films using a tape casting process on glass substrates. A slurry of thermoelectric (Bi0.48Sb1.52)Te3 was developed and cured thick films were annealed in a vacuum chamber at 500–600 °C. The microstructure of these films was analyzed, and the Seebeck coefficient and electric conductivity were tested. It was found that the subsequent annealing process must be carefully designed to achieve good thermoelectric properties of these samples. Conductive films were obtained after annealing and led to acceptable thermoelectric performance. While the properties of these initial materials are not at the level of bulk materials, this work demonstrates that the low-cost tape casting technology is promising for fabricating thermoelectric modules for energy conversion.

scholarly journals Architectures and Applications of BODIPY-Based Conjugated Polymers

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 75
Author(s):  
Yiqi Fan ◽  
Jinjin Zhang ◽  
Zhouyi Hong ◽  
Huayu Qiu ◽  
Yang Li ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Chemical Doping ◽  
Structure Property ◽  
High Quantum Yield ◽  
Conjugated Materials ◽  
Energy Band Gap ◽  
Photoelectric Properties ◽  
Structure Property Relationship ◽  
Insight Into ◽  
High Absorption

Conjugated polymers generally contain conjugated backbone structures with benzene, heterocycle, double bond, or triple bond, so that they have properties similar to semiconductors and even conductors. Their energy band gap is very small and can be adjusted via chemical doping, allowing for excellent photoelectric properties. To obtain prominent conjugated materials, numerous well-designed polymer backbones have been reported, such as polyphenylenevinylene, polyphenylene acetylene, polycarbazole, and polyfluorene. 4,4′-Difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY)-based conjugated polymers have also been prepared owing to its conjugated structure and intriguing optical properties, including high absorption coefficients, excellent thermal/photochemical stability, and high quantum yield. Most importantly, the properties of BODIPYs can be easily tuned by chemical modification on the dipyrromethene core, which endows the conjugated polymers with multiple functionalities. In this paper, BODIPY-based conjugated polymers are reviewed, focusing on their structures and applications. The forms of BODIPY-based conjugated polymers include linear, coiled, and porous structures, and their structure–property relationship is explored. Also, typical applications in optoelectronic materials, sensors, gas/energy storage, biotherapy, and bioimaging are presented and discussed in detail. Finally, the review provides an insight into the challenges in the development of BODIPY-based conjugated polymers.

scholarly journals Direct measurement of the thermoelectric properties of electrochemically deposited Bi2Te3 thin films

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jose Recatala-Gomez ◽  
Pawan Kumar ◽  
Ady Suwardi ◽  
Anas Abutaha ◽  
Iris Nandhakumar ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermoelectric Properties ◽  
Bismuth Telluride ◽  
Indium Tin Oxide ◽  
Seed Layer ◽  
Room Temperature ◽  
Low Cost ◽  
Temperature Dependent ◽  
Temperature Heat ◽  
Electrochemically Deposited

Abstract The best known thermoelectric material for near room temperature heat-to-electricity conversion is bismuth telluride. Amongst the possible fabrication techniques, electrodeposition has attracted attention due to its simplicity and low cost. However, the measurement of the thermoelectric properties of electrodeposited films is challenging because of the conducting seed layer underneath the film. Here, we develop a method to directly measure the thermoelectric properties of electrodeposited bismuth telluride thin films, grown on indium tin oxide. Using this technique, the temperature dependent thermoelectric properties (Seebeck coefficient and electrical conductivity) of electrodeposited thin films have been measured down to 100 K. A parallel resistor model is employed to discern the signal of the film from the signal of the seed layer and the data are carefully analysed and contextualized with literature. Our analysis demonstrates that the thermoelectric properties of electrodeposited films can be accurately evaluated without inflicting any damage to the films.

Nickel doping as an effective strategy to promote separation of photogenerated charge carriers for efficient solar-fuels production

2021 ◽  
Author(s):  
Jin Wang ◽  
Yimin Xuan ◽  
Kai Zhang
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Low Cost ◽  
Solar Fuels ◽  
Charge Carriers ◽  
Effective Strategy ◽  
Nickel Doping

Enhancing the utilization of visible light and promoting the separation of photogenerated charge carriers are critical to improve the performance of semiconductor photocatalysts. Herein, nickel, a low cost transition metal...

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