1. 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.
- Author
-
Hung-Yang Chen, Nikolka, Mark, Wadsworth, Andrew, Wan Yue, Ada Onwubiko, Mingfei Xiao, White, Andrew J. P., Baran, Derya, Sirringhaus, Henning, and McCulloch, Iain
- Subjects
- *
ORGANIC field-effect transistors , *PYRROLES , *SEMICONDUCTORS , *SOLAR cells , *MONOMERS , *COPOLYMERIZATION - Abstract
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 open-circuit voltage (VOC) of 1.04 V was achieved for all polymer solar cells using PTB7-Th as the polymer donor. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF