Unraveling the efficiency-limiting morphological issues of the perylene diimide-based non-fullerene organic solar cells.

ABSTRACT: Herein we report a comparative morphological analysis of the perylene diimide (PDI)- and fullerene-based organic solar cells (OSCs) to identify the factors responsible for low performance of PDI-based devices. A PDI derivative, bis-PDI, and a fullerene derivative, PC₇₀BM, are mixed with an efficient polymer donor, PffBT4T-2OD. The large disparity in power conversion efficiencies (PCEs) of OSCs composed of PffBT4T-2OD:bis-PDI (PCE = 5.18%) and PffBT4T-2OD:PC₇₀BM (PCE = 10.19%) observed are attributed to differences in the nanostructural motif of bulk heterojunction (BHJ) morphologies of these blend systems. The X-ray scattering and surface energy characterizations revealed that the structurally dissimilar bis-PDI and PC₇₀BM molecules determine the variation

SUBMITTER: Singh R 

PROVIDER: S-EPMC5809366 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature