Weakening the Aggregations of Polymer Chains toward Efficient Non-Fullerene Polymer Solar Cells

Macromolecular Rapid Communications
Kaili ZhangRenqiang Yang

Abstract

The 2D asymmetric benzodithiophene (BDT) unit is used as a donor unit to construct one new polymer PBDTBDD-Th with benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD) as acceptor building block. In comparison to the polymer PBDTsTh-BDD with a side chain containing a sulfur atom, the devices based on PBDTBDD-Th/ITIC show better performance due to the introduction of carbon atoms in the side chain, which could weaken the self-aggregations of polymer chains. As a result, the devices based on PBDTBDD-Th/ITIC blends yield power conversion efficiencies (PCEs) over 10%, much higher than those based on PBDTsTh-BDD/ITIC blends (7.09%). The exciton dissociation probabilities (P diss ) of a device based on PBDTBDD-Th/ITIC blends is 95.3%, which suggests that the device achieves good exciton dissociation and charge transfer. In general, the polymer PBDTBDD-Th shows capability to increase the PCEs of polymer solar cells (PSCs) with a non-fullerene acceptor.

References

Dec 14, 2011·Chemical Society Reviews·Huanli DongWenping Hu
Sep 20, 2012·Journal of the American Chemical Society·Jiaoyan ZhouYongsheng Chen
Jun 12, 2013·Scientific Reports·Vinay GuptaAlan J Heeger
Nov 20, 2014·Advanced Materials·Jing-De ChenJian-Xin Tang
Oct 28, 2015·Accounts of Chemical Research·Christian B NielsenIain McCulloch
Mar 26, 2016·Journal of the American Chemical Society·Yuze LinXiaowei Zhan

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