BODIPY-Thiophene Copolymers as p -Channel Semiconductors for Organic Thin-Film Transistors

Summary of Optical Absorption, a) Electrochemical Properties, b) Molecular Weights and PDIs, c) and Field-Effect Mobilities, Current on/off Ratios, and Threshold Voltages d) of Polymers P1 – P4 , and Corresponding Estimated Frontier Molecular Orbital Energies. e) Compd. M n [kDa]PDI E oxd1 [V]LUMO [eV]HOMO [eV]λ abs-sol [nm] (E g [eV])λ abs-fi lm [nm] (E g [eV])μ avg [cm 2 V − 1 s − 1 ]I on /I off V T [V] P1 14 2.1 1.15 –3.68 –5.59 404,565(1.98) 404,565(1.91) 0.0002 3–4 –50 P2 46 3.0 0.78 –3.55 –5.22 462,589(1.72) 457,595(1.67) 0.001 4–5 –32 P3 6.3 2.7 0.90 –3.89 –5.34 410,700(1.50) 424,789(1.45) 0.17 5–6 –46 P4 15 2.9 0.60 –3.81 –5.04 462,787(1.28) 477,850(1.23) 0.007 4–5 –37a) In THF solution (1 × 10 –5 M) and as spin-coated thin fi lm on glass, optical bandgap is estimated from the low-energy band edge of the UV-vis spectrum; b) As thin-fi lm on Pt electrode in 0.1 M TBAPF 6 /MeCN vs . SCE; c) Room temperature gel-permeation chromatography (GPC) in THF vs. PS standards;