Title: Unraveling the Main Chain and Side Chain Effects on Thin Film Morphology and Charge Transport in Quinoidal Conjugated Polymers

Abstract

Three series of low-bandgap polymers based on a novel quinoidal para-azaquinodimethane (p-AQM) unit are devised and synthesized, enabling an in-depth study of the impact of structural factors such as polymer main chain, branching point of the side chain, and the length of the branch chains on the thin film morphologies and charge transport properties. Morphological studies reveal that the polymers composed of larger repeating units exhibit a stronger tendency to form edge-on lamella. In contrast, altering the side chain structures of polymers with the same main chain configuration indicates that the branching point position has a more deterministic impact than the branch chain length on the interchain interactions and the crystallite orientation. These results demonstrate a compound odd-even effect of the branching point on the chain packing and morphology, which correlates well with the corresponding field effect transistor performances. The polymer with the branching point at the fourth carbon displays the highest charge carrier mobility over 1.0 cm² V-Three series of low-bandgap polymers based on a novel quinoidal para-azaquinodimethane (p-AQM) unit are devised and synthesized, enabling an in-depth study of the impact of structural factors such as polymer main chain, branching point of the side chain, and the length ofmore » the branch chains on the thin film morphologies and charge transport properties. Morphological studies reveal that the polymers composed of larger repeating units exhibit a stronger tendency to form edge-on lamella. On the other hand, altering the side chain structures of polymers with the same main chain configuration indicates that the branching point position has a more deterministic impact than the branch chain length on the interchain interactions and the crystallite orientation. These results reflect a compound odd-even effect of the branching point on the chain packing and morphology, which correlates well with the corresponding field effect transistor performances. The polymer with the branching point at the fourth carbon displays the highest charge carrier mobility over 1.0 cm² V^-1 s^-1, concurrent with a bimodal texture. This study provides a comprehensive description of the correlations between polymer structures, thin film morphology, and device performances, providing a clear path to desirable bimodal thin film texture for charge transport.« less

Authors:

Liu, Xuncheng ^[1]; He, Bo ^[2]; Garzón-Ruiz, Andrés ^[3]; Navarro, Amparo ^[4]; Chen, Teresa L. ^[2]; Kolaczkowski, Matthew A. ^[2]; Feng, Shizhen ^[5]; Zhang, Lianjie ^[5]; Anderson, Christopher A. ^[2]; Chen, Junwu ^[5]; Liu, Yi  ^[2]

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+ Show Author Affiliations

1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); South China Univ. of Technology (SCUT), Guangzhou (China)
2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
3. Univ. of Castilla–La Mancha, Albacete (Spain)
4. Jaén Univ. (Spain)
5. South China Univ. of Technology (SCUT), Guangzhou (China)

Publication Date:

Tue Jun 05 00:00:00 EDT 2018

Research Org.:

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); China Scholarship Council

OSTI Identifier:

1530370

Alternate Identifier(s):

OSTI ID: 1785874

Grant/Contract Number:  

AC02-05CH11231; DE‐AC02‐05CH11231; DE‐AC02‐05‐CH11231

Resource Type:

Accepted Manuscript

Journal Name:

Advanced Functional Materials

Additional Journal Information:

Journal Volume: 28; Journal Issue: 31; Journal ID: ISSN 1616-301X

Publisher:

Wiley

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; charge transport; conjugated polymer; low bandgap; morphology; quinoidal