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3 results on '"BDOPV"'

1. Water stability of organic and electrolyte-gated field-effect transistors

Author

Simatos, Dimitrios, Sirringhaus, Henning, and Knowles, Tuomas

Subjects
Conjugated polymers, Organic semiconductors, Organic electronics, Organic bioelectronics, Biosensors, Lab on a chip, Microfluidics, Stability, Water stability, Additives, Contaminants, Leachables, Extractables, IDTBT, PBTTT, P3HT, F4TCNQ, F2TCNQ, TCNQ, BDOPV, Ultrapure water, DI water, Saline solution
Abstract

Organic bioelectronics is an emerging field that utilizes electronic devices made from a large family of aromatic compounds (conjugated polymers and small molecules) for biological applications. Organic materials seem ideal candidates for bioelectronics due to their softness, biocompatibility, stretchability, and their ability to conduct both electrons and ions. Many fundamental studies have been conducted, utilizing devices such as the Organic Field Effect Transistor (OFET), the Electrolyte-Gated OFET (EG-OFET), and the Organic Electro-Chemical Transistor (OECT). However, water constitutes a key factor in charge trapping and device degradation in organic materials, due to its strong dipole moment, high dielectric constant, and its omnipresence in almost all processing, environmental, and operational conditions. In this dissertation, we used an additives-based approach to stabilize OFETs immersed in DI water and saline solution, for periods up to a month, making the first high-performance water-stable OFETs reported in the literature. We then repeated the long-term water stability experiments on EG-OFETs, and demonstrated that cleanly fabricated EG-OFETs can remain stable within the course of an overnight measurement (16 hours), without needing the additive stabilization process. By comparing the water stability of OFETs and EG-OFETs, we highlighted the different requirements involved in stabilizing these two architectures, challenging the notion that organic materials are intrinsically unstable in water.

Published
2022
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2. N-Type Charge Carrier Transport Properties of BDOPV-Benzothiadiazole-Based Semiconducting Polymers

Author

Siyu Wang, Takehiko Mori, Sultan Otep, Joost Kimpel, and Tsuyoshi Michinobu

Subjects
Electron mobility, Materials science, Condensation polymer, Absorption spectroscopy, Computer Networks and Communications, Band gap, lcsh:TK7800-8360, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Crystallinity, n-channel transistors, BDOPV, electron transport, Electrical and Electronic Engineering, HOMO/LUMO, chemistry.chemical_classification, Organic electronics, lcsh:Electronics, Polymer, 021001 nanoscience & nanotechnology, organic transistors, 0104 chemical sciences, chemistry, Hardware and Architecture, Control and Systems Engineering, Signal Processing, Physical chemistry, 0210 nano-technology
Abstract

High-performance n-type organic semiconducting polymers are key components of next-generation organic electronics. Here, we designed and synthesized two electron deficient organic polymers composed of benzodifurandione-based oligo (p-phenylenevinylene) (BDOPV) and benzothiadiazole by Stille coupling polycondensation. BDOPV-benzothiadiazole-based copolymer (PBDOPV-BTT) possesses a D-A1-D-A2 type backbone with intramolecular charge&ndash, transfer interactions, while PBDOPV-BTTz is an all-acceptor polymer. The former has a higher molecular weight (Mn) of 109.7 kg∙mol&minus, 1 than the latter (Mn = 20.2 kg∙mol&minus, 1). The structural difference of these polymers was confirmed by the optical absorption spectra. PBDOPV-BTT showed a more bathochromically shifted absorption spectrum than PBDOPV-BTTz. The longer wavelength absorption of PBDOPV-BTT was due to the intramolecular charge transfer. Therefore, PBDOPV-BTT had a narrower band gap than PBDOPV-BTTz. However, this feature was not reflected by the lowest unoccupied molecular orbital (LUMO) levels. Both polymers displayed almost the same LUMO level of &minus, 3.8 eV. Accuracy of this observation was cross-verified by density functional theory (DFT) calculations. The electron-transporting properties were investigated by thin film transistors. PBDOPV-BTT showed an electron mobility (&mu, e) of 1.02 &times, 10&minus, 2 cm2 V&minus, 1 s&minus, 1 under the optimized annealing conditions. PBDOPV-BTTz exhibited poorer transistor performances with the optimized &mu, e of 9.54 &times, 6 cm2 V&minus, 1. Finally, the grazing-incidence wide angle X-ray scattering (GIWAXS) measurements of both polymer films revealed the higher crystallinity of PBDOPV-BTT with the edge-on orientation.

Published
2020

3. N-Type Charge Carrier Transport Properties of BDOPV-Benzothiadiazole-Based Semiconducting Polymers.

Author

Wang, Siyu, Otep, Sultan, Kimpel, Joost, Mori, Takehiko, and Michinobu, Tsuyoshi

Subjects
FRONTIER orbitals, CHARGE carriers, THIN film transistors, INTRAMOLECULAR charge transfer, BAND gaps, CHARGE transfer
Abstract

High-performance n-type organic semiconducting polymers are key components of next-generation organic electronics. Here, we designed and synthesized two electron deficient organic polymers composed of benzodifurandione-based oligo (p-phenylenevinylene) (BDOPV) and benzothiadiazole by Stille coupling polycondensation. BDOPV-benzothiadiazole-based copolymer (PBDOPV-BTT) possesses a D-A1-D-A2 type backbone with intramolecular charge–transfer interactions, while PBDOPV-BTTz is an all-acceptor polymer. The former has a higher molecular weight (Mn) of 109.7 kg∙mol−1 than the latter (Mn = 20.2 kg∙mol−1). The structural difference of these polymers was confirmed by the optical absorption spectra. PBDOPV-BTT showed a more bathochromically shifted absorption spectrum than PBDOPV-BTTz. The longer wavelength absorption of PBDOPV-BTT was due to the intramolecular charge transfer. Therefore, PBDOPV-BTT had a narrower band gap than PBDOPV-BTTz. However, this feature was not reflected by the lowest unoccupied molecular orbital (LUMO) levels. Both polymers displayed almost the same LUMO level of −3.8 eV. Accuracy of this observation was cross-verified by density functional theory (DFT) calculations. The electron-transporting properties were investigated by thin film transistors. PBDOPV-BTT showed an electron mobility (μe) of 1.02 × 10−2 cm2 V−1 s−1 under the optimized annealing conditions. PBDOPV-BTTz exhibited poorer transistor performances with the optimized μe of 9.54 × 10−6 cm2 V−1 s−1. Finally, the grazing-incidence wide angle X-ray scattering (GIWAXS) measurements of both polymer films revealed the higher crystallinity of PBDOPV-BTT with the edge-on orientation. [ABSTRACT FROM AUTHOR]

Published
2020
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