Abstract
A series of diketopyrrolopyrrole (DPP)-based copolymers, with DPP and bithiophene (BT) as the electron-acceptor and donor backbone units, respectively, are synthesized with branched alkyl side chains that are either directly coupled to the N-positions of DPP or separated by an alkyl ester group. The ester moieties in the side chains induce specific cohesive molecular interactions between these side chains, as compared to the alkyl-only side chains with weak van der Waals interactions. Structure analysis of the DPPBT-based copolymers demonstrated that the introduction of a proper alkyl ester spacer to the branched alkyl chains can shorten the π-π stacking distance between the DPPBT backbones down to 3.61 Å and promote the development of two-dimensionally extended domains. DPPBT-based copolymers, including different branched alkyl ester-labeled side chains, are spun-cast on polymer-treated SiO2 dielectrics from dilute chloroform solutions for organic thin-film transistors. A DPPBT-based copolymer with properly engineered side chains (i.e., 2-decyltetradecyl ester-labeled side chains) shows the highest hole mobility of 2.30 cm2 V-1 s-1 and an on/off current ratio of above 106.
| Original language | English |
|---|---|
| Pages (from-to) | 40681-40691 |
| Number of pages | 11 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 10 |
| Issue number | 47 |
| DOIs | |
| Publication status | Published - 2018 Nov 28 |
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Keywords
- alkyl ester
- cohesive side chain interaction
- conjugated polymer
- diketopyrrolopyrrole
- organic thin-film transistor
- side chain engineering
ASJC Scopus subject areas
- Materials Science(all)
Cite this
Influence of Branched Alkyl Ester-Labeled Side Chains on Specific Chain Arrangement and Charge-Transport Properties of Diketopyrrolopyrrole-Based Conjugated Polymers. / Kim, Hyung Jong; Pei, Mingyuan; Ko, Joong Se; Ma, Min Hee; Park, Gi Eun; Baek, Jimin; Yang, Hoichang; Cho, Min Ju; Choi, Dong Hoon.
In: ACS Applied Materials and Interfaces, Vol. 10, No. 47, 28.11.2018, p. 40681-40691.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Influence of Branched Alkyl Ester-Labeled Side Chains on Specific Chain Arrangement and Charge-Transport Properties of Diketopyrrolopyrrole-Based Conjugated Polymers
AU - Kim, Hyung Jong
AU - Pei, Mingyuan
AU - Ko, Joong Se
AU - Ma, Min Hee
AU - Park, Gi Eun
AU - Baek, Jimin
AU - Yang, Hoichang
AU - Cho, Min Ju
AU - Choi, Dong Hoon
PY - 2018/11/28
Y1 - 2018/11/28
N2 - A series of diketopyrrolopyrrole (DPP)-based copolymers, with DPP and bithiophene (BT) as the electron-acceptor and donor backbone units, respectively, are synthesized with branched alkyl side chains that are either directly coupled to the N-positions of DPP or separated by an alkyl ester group. The ester moieties in the side chains induce specific cohesive molecular interactions between these side chains, as compared to the alkyl-only side chains with weak van der Waals interactions. Structure analysis of the DPPBT-based copolymers demonstrated that the introduction of a proper alkyl ester spacer to the branched alkyl chains can shorten the π-π stacking distance between the DPPBT backbones down to 3.61 Å and promote the development of two-dimensionally extended domains. DPPBT-based copolymers, including different branched alkyl ester-labeled side chains, are spun-cast on polymer-treated SiO2 dielectrics from dilute chloroform solutions for organic thin-film transistors. A DPPBT-based copolymer with properly engineered side chains (i.e., 2-decyltetradecyl ester-labeled side chains) shows the highest hole mobility of 2.30 cm2 V-1 s-1 and an on/off current ratio of above 106.
AB - A series of diketopyrrolopyrrole (DPP)-based copolymers, with DPP and bithiophene (BT) as the electron-acceptor and donor backbone units, respectively, are synthesized with branched alkyl side chains that are either directly coupled to the N-positions of DPP or separated by an alkyl ester group. The ester moieties in the side chains induce specific cohesive molecular interactions between these side chains, as compared to the alkyl-only side chains with weak van der Waals interactions. Structure analysis of the DPPBT-based copolymers demonstrated that the introduction of a proper alkyl ester spacer to the branched alkyl chains can shorten the π-π stacking distance between the DPPBT backbones down to 3.61 Å and promote the development of two-dimensionally extended domains. DPPBT-based copolymers, including different branched alkyl ester-labeled side chains, are spun-cast on polymer-treated SiO2 dielectrics from dilute chloroform solutions for organic thin-film transistors. A DPPBT-based copolymer with properly engineered side chains (i.e., 2-decyltetradecyl ester-labeled side chains) shows the highest hole mobility of 2.30 cm2 V-1 s-1 and an on/off current ratio of above 106.
KW - alkyl ester
KW - cohesive side chain interaction
KW - conjugated polymer
KW - diketopyrrolopyrrole
KW - organic thin-film transistor
KW - side chain engineering
UR - http://www.scopus.com/inward/record.url?scp=85056733033&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85056733033&partnerID=8YFLogxK
U2 - 10.1021/acsami.8b13292
DO - 10.1021/acsami.8b13292
M3 - Article
VL - 10
SP - 40681
EP - 40691
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 47
ER -