Pyrazino[2,3-g]quinoxaline-2,7-dione based π-conjugated polymers with affinity towards acids and semiconductor performance in organic thin film transistors

Abstract

Pyrazino[2,3-g]quinoxaline-2,7-dione (PQx) was used as a building block for π-conjugated polymer semiconductors, which demonstrated a strong acid affinity by showing marked bathochromic shifts in their absorption spectra. These polymers exhibited semiconductor performance in organic thin film transistors (OTFTs). Copolymers of PQx and bithiophene exhibited electron-dominant ambipolar transport characteristics with electron mobilities of up to 4.28 × 10⁻³ cm² V⁻¹ s⁻¹ and hole mobilities of up to 5.22 × 10⁻⁴ cm² V⁻¹ s⁻¹, while copolymers of PQx and thieno[3,2-b]thiophene exhibited hole-dominant ambipolar transport characteristics with hole mobilities of up to 4.82 × 10⁻² cm² V⁻¹ s⁻¹ and electron mobilities of up to 3.95 × 10⁻³ cm² V⁻¹ s⁻¹.