Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 9, Pages 10746-10754Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b22927
Keywords
perylene diimide; regioregular donor polymer; planar; non-fullerene electron acceptors; organic solar cells
Funding
- National Natural Science Foundation of China [51933001, 21975031, 21574013, 21734009, 21421003]
- Beijing Natural Science Foundation [2182030]
- Program for Changjiang Scholars and Innovative Research Team in University
- Fundamental Research Funds for the Central Universities
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We designed and synthesized two non-fullerene acceptors (CDTTFP and C8X-TFP), which comprise a central 4H-cyclopenta[2,1-b:3,4-b']dithiophene (CDT) as the bridge and two thiophene-fused perylene diimide (TFP) units. The bulky side chains, such as the 4-hexylphenyl side chains, on the CDT bridge can effectively prevent the acceptor molecules from forming large aggregates, and the pi - pi stacking of the terminal planar TFP units can form effective electron transport pathways when blending with the donor polymers. These non-fullerene acceptors are used to fabricate organic solar cells (OSCs) by blending with the regioregular middle bandgap polymer reg-PThE. The as-cast devices based on reg-PThE:CDT-TFP show the best power conversion efficiency (PCE) of 8.36% with a V-oc of 1.10 V, J(sc) of 12.43 mA cm(-2), and an FF of 61.4%, whereas the analogue perylene diimide (PDI) dimers (CDT-PDI) that comprise two PDI units bridged with a CDT unit show only a 2.59% PCE with a V-oc of 0.92 V, J(sc) of 6.82 mA cm(-2), and an FF of 41.5%. Our results have demonstrated that the non-fullerene acceptors comprising planar PDI units can achieve excellent photovoltaic performance and provide meaningful guidelines for the design of PDI-based non-fullerene electron acceptors for efficient OSCs.
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