Journal
ACS APPLIED ENERGY MATERIALS
Volume 1, Issue 11, Pages 6549-6559Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.8b01447
Keywords
multichloro-substitution; side-chain engineering; high open-circuit voltage; low photon energy loss; polymer solar cells; nonfullerene acceptor
Funding
- SUSTech
- Recruitment Program of Global Youth Experts of China
- National Natural Science Foundation of China [51773087, 21733005]
- Shenzhen Fundamental Research Program [JCYJ20160504151536406, JCYJ20160504151731734, JCYJ20170817111214740]
- Shenzhen Nobel Prize Scientists Laboratory Project [C17783101]
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The large photon energy loss (E-loss) in the conversion from photons to electrons is still one of the critical factors in limiting the performance of polymer solar cells (PSCs). In order to simultaneously obtain the decreased Eloss and expanded spectral response, the reasonable design of wide band gap conjugated polymer with a low-lying HOMO level is still a great challenge in nonfullerene PSCs. In this work, four DA type wide band gap conjugated polymers with introduced chlorine atoms on the conjugated thienyl-side chains of the BDT units, namely, PBT1Cl-Bz, PBT2Cl(as)-Bz, PBT2Cls-Bz, and PBT4Cl-Bz, were synthesized and characterized. Because of the large dipole moment of carbonchlorine (C-Cl) and the strong noncovalent interaction of Cl center dot center dot center dot S and Cl center dot center dot center dot p, the tetrachloro-substituted PBT4Cl-Bz exhibits a much deeper HOMO level (-5.64 eV) than the other three polymers. Therefore, a high open-circuit voltage (V-oc) of 0.96 V was achieved while keeping a decent Jsc of 16.04 mA cm(2) when matched with nonfullerene acceptor IT-4F, and a quite small E-loss of 0.54 eV was achieved which was close to the values of some inorganic and hybrid solar cells. In addition, the chlorination of conjugated side chain demonstrated that the amount and position of chlorine atoms contributed to enhanced molecular packing and morphology control. Benefits from the stronger intermolecular pp interaction and the suitable phase separation, the highest hole mobility, and reduced bimolecular recombination are obtained from PBT4Cl-Bz. As a result, the photovoltaic performance of the PBT4Cl-Bz:IT-4F-based device achieved a power conversion efficiency of 9.25% without any solvent additive. These results indicate that the multiple chlorination of conjugated thiophene side chain on BDT units will be an extremely promising method to modify their molecular energy levels with small energy loss for applications in nonfullerene PSCs.
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