A Non-Conjugated Polymer Acceptor for Efficient and Thermally Stable All-Polymer Solar Cells.

ABSTRACT: A non-conjugated polymer acceptor PF1-TS4 was firstly synthesized by embedding a thioalkyl segment in the mainchain, which shows excellent photophysical properties on par with a fully conjugated polymer, with a low optical band gap of 1.58?eV and a high absorption coefficient >10⁵ ?cm^-1 , a high LUMO level of -3.89?eV, and suitable crystallinity. Matched with the polymer donor PM6, the PF1-TS4-based all-PSC achieved a power conversion efficiency (PCE) of 8.63?%, which is ?45?% higher than that of a device based on the small molecule acceptor counterpart IDIC16. Moreover, the PF1-TS4-based all-PSC has good thermal stability with ?70?% of its initial PCE retained after being stored at 85?°C for 180?h, while the IDIC16-based device only retained ?50?% of its initial PCE when stored at 85?°C for only 18?h. Our work provides a new strategy to develop efficient polymer acceptor materials by linkage of conjugated units with non-conjugated thioalkyl segments.

SUBMITTER: Fan Q 

PROVIDER: S-EPMC7692906 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature