Table 1. Electrical Properties of Transistors Based on the C8-BTBT/PMMA Film Deposited by Spin-Coating on Different Polymer Modification Layers at 2000 rpm.

dielectric	Ci (nF/cm2)	Vth (V)	Ion/Ioff	SS (V/decade)	Ntrapmax (cm–2 eV–1)	average mobility (cm2/V·s)
SiO2	11.4	–47.7 ± 4.5	105–106	8.2 ± 0.4	(9.8 ± 0.5) × 1012	0.12 ± 0.09
PMMA/SiO2	10.2	–42.3 ± 4.2	105–106	6.3 ± 0.3	(7.5 ± 0.3) × 1012	0.65 ± 0.25
PS/SiO2	11.3	–33.5 ± 3.9	>107	4.7 ± 0.3	(5.6 ± 0.3) × 1012	1.86 ± 1.02