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Title: Tailored Assemblies of Rod-Coil Poly(3-hexylthiophene)-b-Polystyrene Diblock Copolymers: Adaptable Building Blocks for High-Performance Organic Field-Effect Transistors

Abstract

The self-assembly process and resulting structure of a series of conductive diblock copolymer thin films of Poly(3-hexylthiophene)-b-Polystyrene (P3HT-b-PS) have been studied by TEM, SAED, GIXD and AFM and additionally by first principles modeling and simulation. By varying the molecular weight of the P3HT segment, these block copolymers undergo microphase separation and self-assemble into nanostructured sphere, lamellae, nanofiber, and nanoribbon in the films. Within the diblock copolymer thin film, the convalently bonded PS blocks segregated to form amorphous domains, however, the conductive P3HT blocks were crystalline, exhibiting highly-ordered molecular packing with their alkyl side chains aligned along to the normal to the substrate and the - stacking direction of the thiophene rings aligned parallel to the substrate. The conductive P3HY block copolymers exhibited significant improvements in organic feild-effect transistor (OFET) performance and environmental stability as compared to P3HT homopolymers, with up to a factor of two increase in measured moblity (0.08 cm2/Vs ) for the P4 (85 wt% P3HT). Overall, this work demonstrates that the high degree of molecular order induced by bock copolymer phase separation can improve the transport properties and stability of conductive polymer critical for high-performance OFET s.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1018586
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 5; Journal Issue: 5; Journal ID: ISSN 1616-301X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COPOLYMERS; FIELD EFFECT TRANSISTORS; LAMELLAE; MOLECULAR WEIGHT; PERFORMANCE; POLYMERS; SIMULATION; STABILITY; SUBSTRATES; THIN FILMS; THIOPHENE; TRANSISTORS; TRANSPORT

Citation Formats

Xiao, Kai, Yu, Xiang, Chen, Jihua, Lavrik, Nickolay V, Hong, Kunlun, Sumpter, Bobby, and Geohegan, David B. Tailored Assemblies of Rod-Coil Poly(3-hexylthiophene)-b-Polystyrene Diblock Copolymers: Adaptable Building Blocks for High-Performance Organic Field-Effect Transistors. United States: N. p., 2011. Web.
Xiao, Kai, Yu, Xiang, Chen, Jihua, Lavrik, Nickolay V, Hong, Kunlun, Sumpter, Bobby, & Geohegan, David B. Tailored Assemblies of Rod-Coil Poly(3-hexylthiophene)-b-Polystyrene Diblock Copolymers: Adaptable Building Blocks for High-Performance Organic Field-Effect Transistors. United States.
Xiao, Kai, Yu, Xiang, Chen, Jihua, Lavrik, Nickolay V, Hong, Kunlun, Sumpter, Bobby, and Geohegan, David B. Sat . "Tailored Assemblies of Rod-Coil Poly(3-hexylthiophene)-b-Polystyrene Diblock Copolymers: Adaptable Building Blocks for High-Performance Organic Field-Effect Transistors". United States.
@article{osti_1018586,
title = {Tailored Assemblies of Rod-Coil Poly(3-hexylthiophene)-b-Polystyrene Diblock Copolymers: Adaptable Building Blocks for High-Performance Organic Field-Effect Transistors},
author = {Xiao, Kai and Yu, Xiang and Chen, Jihua and Lavrik, Nickolay V and Hong, Kunlun and Sumpter, Bobby and Geohegan, David B},
abstractNote = {The self-assembly process and resulting structure of a series of conductive diblock copolymer thin films of Poly(3-hexylthiophene)-b-Polystyrene (P3HT-b-PS) have been studied by TEM, SAED, GIXD and AFM and additionally by first principles modeling and simulation. By varying the molecular weight of the P3HT segment, these block copolymers undergo microphase separation and self-assemble into nanostructured sphere, lamellae, nanofiber, and nanoribbon in the films. Within the diblock copolymer thin film, the convalently bonded PS blocks segregated to form amorphous domains, however, the conductive P3HT blocks were crystalline, exhibiting highly-ordered molecular packing with their alkyl side chains aligned along to the normal to the substrate and the - stacking direction of the thiophene rings aligned parallel to the substrate. The conductive P3HY block copolymers exhibited significant improvements in organic feild-effect transistor (OFET) performance and environmental stability as compared to P3HT homopolymers, with up to a factor of two increase in measured moblity (0.08 cm2/Vs ) for the P4 (85 wt% P3HT). Overall, this work demonstrates that the high degree of molecular order induced by bock copolymer phase separation can improve the transport properties and stability of conductive polymer critical for high-performance OFET s.},
doi = {},
url = {https://www.osti.gov/biblio/1018586}, journal = {Advanced Functional Materials},
issn = {1616-301X},
number = 5,
volume = 5,
place = {United States},
year = {2011},
month = {1}
}