Effect of pre-aggregation in solution state on the performance of organic field-effect transistors with indacenodithiophene-co-benzothiadiazole
- 저자
- Eun-Sol Shin, Yong-Young Noh*
- 저널명
- Organic Electronics, 53, 111-116 (2018)
- 년도
- 2018
- Link
- https://doi.org/10.1016/j.orgel.2017.11.032 149회 연결
[Abstract]
We study the effect of solvent and pre-aggregated solution formed in a binary solvent system to achieve high performance organic field-effect transistors (OFETs) with indacenodithiophene-co-benzothiadiazole (IDT-BT) polymer. To quantify the degree of pre-aggregation, we selected a binary solvent system consisting of a mixture of good (chloronaphthanlene (CN), bp = 259 °C) and bad (2-methoxyl ethanol (2-ME), bp = 124 °C) solvents with various mixing ratios from 0 to 30 v% with the help of a Hansen solubility parameters program. The formation of pre-aggregated IDT-BT polymer was identified in an 8:2 CN:2-ME solvent ratio via a red-shift in a UV–vis absorption spectrum. The off-center spin coated IDT-BT OFETs from 8:2 ratio (CN:2-ME) solution exhibited more than double the improvement in field effect mobility (μFET = 1.38 ± 0.19 cm2/Vs) due to efficient charge injection through the smooth semiconducting film surface fabricated by the off-center spin-coating process from the polymer pre-aggregate in the binary solvent system with an appropriate mixing ratio.