Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.278
Publication date: 7th February 2022
Solution processed doped layers are of extreme importance for high throughput production of organic electronic devices via roll-to-roll or ink-jet printing. In this talk, I will discuss tuning the conductivity of conjugated polymers containing Lewis basic sites by Lewis acids. Addition of the Lewis acid effectively p-dopes the hole transport in the parent polymer, leading to increases in the free hole density and conductivity. This methodology is advantageous since the polymer and Lewis acid have excellent solubility in organic solvents, negating the need for co-solvents that uses in molecular dopant such as F4TCNQ. We use a combination of techniques including electrical measurements, optical absorption, XPS, UPS, IPES, and electron paramagnetic resonance (EPR), electron-nuclear double resonance (ENDOR) and nuclear magnetic resonance (NMR), and gas chromatography techniques in conjunction with density functional theory, to gain insight into the doping mechanism of 4,4-dihexadecyl-4H-cyclopenta[1,2-b:5,4-b′]dithiophene (CPDT) and 2,1,3-benzothiadiazole (BT)-based (PCPDTBT) by Lewis acids, BCF, and to explain why the doping efficiency is much higher for BCF than for F4TCNQ.
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