A-D-A type non-fused acceptors employing naphthalene core for high open circuit voltage organic solar cell applications
To obtain high-performance,low-cost,structurally simple non-fused-ring electron acceptor molecules and expand their commercial applications,two isomeric non-fused-ring small molecule electron acceptors,26NO4F and 15NO4F,were synthesized from 3,7-dibromo-2,6-naphthalenediol and 2,6-dibromo-1,5-naphthalenediol through alkylation reactions,Stille coupling,Knoevenagel condensation,etc.,and their optical absorption,energy levels,thermal properties,photovoltaic device performance,and morphology were characterized.The results show that in organic photovoltaic devices,using PM7 as the donor polymer,both PM7:26NO4F and PM7:15NO4F devices have open circuit voltages(Voc)exceeding 1.0 eV,but the PM7:26NO4F device exhibits higher short circuit current(Jsc)and fill factor(FF),with a power conversion efficiency(PCE)of 6.01%,higher than 5.05%for the PM7:15NO4F device.A design strategy for high Voc electron acceptor molecules based on naphthalene core is proposed,revealing the influence of alkoxyl substitution position on the performance of non-fused-ring electron acceptors.
organic solar cellnon-fused acceptorisomerizationhigh open circuit voltage
万方数据
维普
