Efficient Fused Ring Extension of A-D-A-type Nonfullerene Acceptors via Symmetric Replicating Core Unit Strategy.

Efficient Fused Ring Extension of A-D-A-type Nonfullerene Acceptors via Symmetric Replicating Core Unit Strategy.
Chemistry. 2020 Mar 25;:
Authors: Sun Y, Xia T, Li C, Ryu HS, Guo J, Min J, Woo HY
Abstract
Extension of a fused aromatic ring core is beneficial for enhancing the intramolecular charge transfer and effective π-conjugation in A-D-A type non-fullerene acceptors (NFAs). In this work, a novel strategy involving extension of fused-ring core by symmetrically replicating core unit was developed, and a novel symmetric fused-12-ring NFA, LC81 was synthesized. When paired with the wide-bandgap polymer donor, PBT1-C, the corresponding organic solar cells (OSCs) showed a high-power conversion efficiency (PCE) of 12.71%, much higher than that of the device based on reference NFA, TPTT-4F. Moreover, the LC81-based OSC displayed a lower energy loss and a better ambient stability than the TPTT-4F-based device. Our results indicate that the extension of fused-ring core by symmetric replicating core unit is an effective strategy for promoting photovoltaic characteristics of A-D-A-type NFAs.
PMID: 32212280 [PubMed - as supplied by publisher]

Source: Chemistry - March 24, 2020 Category: Chemistry Authors: Sun Y, Xia T, Li C, Ryu HS, Guo J, Min J, Woo HY Tags: Chemistry Source Type: research