Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 6, Pages 2468-2475Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta10763c
Keywords
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Funding
- National Natural Science Foundation of China [61377029, 61675017, 61564003, 21572171, 91433201]
- Fundamental Research Funds for the Central Universities [2017JBZ105]
- State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source [LAPS17017]
- Guangxi Natural Science Foundation [2015GXNSFGA139002]
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Two new non-fullerene (NF) acceptors, namely BDTIT-M and BDTThIT-M, were rationally designed to optimize the energy levels and optical bandgap. BDTIT-M is derived by changing the end-group of NFBDT into slightly weak DCI-M, and BDTThIT-M is obtained by adding two conjugated thiophene side-chains into a ladder-type core of BDTIT-M. By incorporating with the polymer donor PBDB-T, BDTIT-M based organic solar cells (OSCs) deliver a higher PCE of 11.31% compared to that of NFBDT based cells, which is mainly attributed to the increased V-OC and FF. A higher PCE of 12.12% with a small energy loss of similar to 0.588 eV is achieved compared with BDTThIT-M based OSCs, benefiting from the elevated LUMO level, narrowed bandgap, and enhanced absorption coefficient and electron mobility of BDTThIT-M compared with BDTIT-M. The combination of a methyl-modified end-group and conjugated side-chain should be an efficient strategy to elevate the LUMO and HOMO levels with different amplitudes for realizing simultaneous improvement in V-OC and J(SC).
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