Benzotriazole based Non-fullerene Acceptors with Rhodanine End-group for Non-fullerene Organic Solar Cells
발표자
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초록
내용
Non-fullerene acceptor materials with low optical bandgap is essential for developing efficient and stable organic solar cells with high power conversion efficiencies. Herein, we synthesized a new NFA namely, (5E,5'E)-5,5'-((12,13-bis(2-ethylhexyl)-6-hexyl-3,9-diundecyl-12,13-dihydro-6H-thieno[2'',3'':4',5']thieno[2',3':4,5]pyrrolo[3,2-g]thieno[2',3':4,5]thieno[3,2-b][1,2,3]triazolo[4,5-e]indole-2,10-diyl)bis(methanylylidene))bis(3-ethyl-2-thioxothiazolidin-4-one)(BTUDR).Interestingly, BTUDR exhibited low Egopt of 1.83 eV with suitable frontier molecular orbital energy levels, highest occupied molecular orbital(HOMO)=-5.59eV and lowest unoccupied molecular orbital(LUMO)=-3.76 eV. BTUDR was thermally stable up to 330 ˚C as revealed by its thermogravimetric analysis(5% weight loss). Therefore, BTUDR blended with polymer PM6 exhibited a PCE of 9.70%, open-circuit voltage(Voc) of 0.85V, a short-circuit current density(Jsc) of 21.19 mA/cm2, and fill factor(FF) of 54.34%, respectively.