A Novel Ladder–type Nonacyclic Arene Donor Building Block For Organic Photovoltaic Applications:Design,Synthesis And Properties

As a novel type of photovoltaic cell,organic solar cell(OSC)has achieved significant improvements.It has received substantial attention due to its simple fabrication process,low cost,flexibility,and light weight.In this paper,the donor and acceptor materials of organic solar cells were designed and synthesized,and their properties were also characterized.The main contents are described as follows:A nonacyclic fused TIBDP unit,consisting of bridged-TI,was designed and synthesized.Two D-A copolymers PTIBDP-BT and PTIBDP-DTBT were developed in which TIBDP as the donor unit and 2,1,3-benzothiadiazole(BT)and 4,7-dithienyl-2,1,3-benzothiadiazole(DTBT)as the acceptor unit by Suzuki and Stille coupling reaction,respectively.Meanwhile the thermal properties,absorption,and the electronic properties of the polymers were characterized and measured.when they applied to the organic solar cells,the device based on the PTIBDP-BT and PTIBDP-DTBT exhibited the PCE of 4.02% and 3.72% under the thermal annealing,respectively.when they applied to the organic field effect transistor memory,PTIBDP-BT and PTIBDP-DTBT achieved a FET mobility of 1.3 × 10–2 cm2 V-1 s-1 under DIO as the solvent additive,the Ion/off of PTIBDP-BT and PTIBDP-DTBT was 5 × 103 and 1.82 × 104,respectively.PTIBDP-BT and PTIBDP-DTBT possessed the memory window of 40 V and 86 V,This work suggesting that nonacyclic acene TIBDP as the donor unit based on TI can be used to construct the D-A polymer and applied to the polymer solar cells and OFET memory.The synthesis of ITIBDP and ITIBDP-T with A-D-A structure was studied by using TIBDP as the donor unit and indanone as the acceptor unit.The thermal stability,spectral absorption and electrochemical properties of the composites were also studied characterization test,respectively,as an acceptor material applied to organic solar cells,photoelectric conversion efficiency were 4.88% and 5.65%.