Effect of Nonconjugated Spacers on Mechanical Properties of Semiconducting Polymers for Stretchable Transistors

被引:160
作者
Mun, Jaewan [1 ]
Wang, Ging-Ji Nathan [1 ]
Oh, Jin Young [1 ,2 ]
Katsumata, Toru [1 ,3 ]
Lee, Franklin L. [1 ]
Kang, Jiheong [1 ]
Wu, Hung-Chin [1 ]
Lissel, Franziska [1 ,4 ]
Rondeau-Gagne, Simon [1 ,5 ]
Tok, Jeffrey B. -H. [1 ]
Bao, Zhenan [1 ]
机构
[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA
[2] Kyung Hee Univ, Dept Chem Engn, Yongin 17104, South Korea
[3] Asahi Kasei Corp, Performance Mat Technol Ctr, Corp Res & Dev, 2-1 Samejima, Fuji, Shizuoka 4168501, Japan
[4] Leibniz Inst Polymer Res Dresden, Inst Macromol Chem, Hohe Str 6, D-01067 Dresden, Germany
[5] Univ Windsor, Dept Chem & Biochem, 401 Sunset Ave, Windsor, ON N9B 3P4, Canada
基金
瑞士国家科学基金会; 美国国家科学基金会;
关键词
conjugation breakers; organic field-effect transistors (OFETs); polymer semiconductors; stretchable electronics; FIELD-EFFECT TRANSISTORS; CONJUGATED POLYMERS; ORGANIC SEMICONDUCTORS; CHARGE-TRANSPORT; ARTIFICIAL SKIN; ELECTRONIC SKIN; THIN-FILMS; MOBILITY; DEVICES; DESIGN;
D O I
10.1002/adfm.201804222
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nonconjugated segments in polymer semiconductors have been utilized to improve the processability of semiconducting polymers. Recently, several reports have described the improvement of stretchability of polymer semiconductors by incorporating nonconjugated spacers. However, the effect of relative flexibility of such conjugation breakers on mechanical and electrical properties has not yet been studied systematically. Here, conjugation breakers with different chain length and rigidity are incorporated into the backbone of diketopyrrolopyrrole-based semiconductors. Interestingly, it is observed that the longer and more flexible conjugation breakers result in greater ductility and lower elastic modulus without significantly affecting mobility. The enhancement of stretchability is attributed to the reduced modulus and the decrease in crystallinity, as confirmed by X-ray diffraction. With this newly established molecular design, transistors are prepared with a semiconducting polymer containing dodecyl segments as conjugation breakers. It is observed that this polymer retains a mobility of >0.36 cm(2) V-1 s(-1) at 100% strain, and after 100 cycles at 50% strain. Finally, its high stability against strain is also observed with a fully stretchable transistor fabricated. Taken together, the above results indicate that molecular engineering of conjugated polymers, i.e., by incorporating suitable conjugation breakers, can effectively tune mechanical properties without significantly compromising their electrical properties.
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页数:10
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