From non-doped to dopable: The impact of methoxy functionalization on doping and thermoelectric properties of conjugated polymer
발표자
()
초록
내용
The introduction of alkoxy side chains into the backbone of conjugated polymers is an effective method to modify their properties. While this approach has been extensively studied in organic solar cells and transistors, its impact on doping and thermoelectric properties remains less clear. This study investigates the effects of methoxy functionalization on conjugated polymers, comparing polymers with and without methoxy groups (P29DPP-BTOM and P29DPP-BT, respectively). We found that the methoxy-functionalization significantly enhances doping efficiency, converting previously undopable pairs to dopable ones. This improvement is due to structural changes in polymer films, such as increased lamellar spacing, which facilitates dopant incorporation within the polymer crystals. Additionally, methoxy functionalization improves the Seebeck coefficient and power factor of doped polymers by inducing a bimodal orientational distribution, leading to increased splitting of the Fermi level and charge transport level.