1 research outputs found
A Thieno[2,3‑<i>b</i>]pyridine-Flanked Diketopyrrolopyrrole Polymer as an n‑Type Polymer Semiconductor for All-Polymer Solar Cells and Organic Field-Effect Transistors
A novel fused heterocycle-flanked
diketopyrrolopyrrole (DPP) monomer,
thienoÂ[2,3-<i>b</i>]Âpyridine 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 thienoÂ[2,3-<i>b</i>]Âpyridine 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 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup> was obtained in bottom-contact, top-gate OFETs, and a power conversion
efficiency (PCE) of 2.72% with a high open-circuit voltage (<i>V</i><sub>OC</sub>) of 1.04 V was achieved for all polymer solar
cells using PTB7-Th as the polymer donor