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A Thieno[2,3‑b]pyridine-Flanked Diketopyrrolopyrrole Polymer as an n‑Type Polymer Semiconductor for All-Polymer Solar Cells and Organic Field-Effect Transistors

Hung-Yang Chen, Mark Nikolka, Andrew Wadsworth, Wan Yue, Ada Onwubiko, Mingfei Xiao, Andrew J. P. White, Derya Baran, Henning Sirringhaus, and Iain McCulloch. "A Thieno[2,3‑b]pyridine-Flanked Diketopyrrolopyrrole Polymer as an n‑Type Polymer Semiconductor for All-Polymer Solar Cells and Organic Field-Effect Transistors" Macromolecules (2018), 51, 71−79.

Hung-Yang Chen, Mark Nikolka, Andrew Wadsworth, Wan Yue, Ada Onwubiko, Mingfei Xiao, Andrew J. P. White, Derya Baran, Henning Sirringhaus, and Iain McCulloch
n-Type Polymer Semiconductor, Solar Cells, Diketopyrrolopyrrole
2018
A novel fused heterocycle-flanked diketopyrrolopyrrole (DPP) monomer, thieno[2,3-b]pyridine diketopyrrolopyrrole (TPDPP), was designed and synthesized. When copolymerized with 3,4-difluorothiophene using Stille coupling polymerization, the new polymer pTPDPP-TF possesses a highly planar conjugated polymer backbone due to the fused thieno[2,3-b]pyridine flanking unit that effectively alleviates the steric hindrance with both the central DPP core and the 3,4-difluorothiophene repeat unit. This new polymer exhibits a high electron affinity (EA) of −4.1 eV and was successfully utilized as an n-type polymer semiconductor for applications in organic field-effect transistors (OFETs) and all polymer solar cells. A promising n-type charge carrier mobility of 0.1 cm2 V−1 s −1 was obtained in bottom-contact, top-gate OFETs, and a power conversion efficiency (PCE) of 2.72% with a high opencircuit voltage (VOC) of 1.04 V was achieved for all polymer solar cells using PTB7-Th as the polymer donor