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首次将染料分子3-乙基绕丹宁连接到[6,6]-苯基-C61-丁酸甲酯(PCBM)上,合成了具有增强光吸收性能的新型富勒烯受体光伏材料PCBRh.通过1 H NMR,13 C NMR和质谱分析确定了PCBRh的结构,紫外-可见吸收光谱测试表明所合成的PCBRh在300~600nm比起PCBM具有更强的光吸收,这归因于3-乙基绕丹宁高的吸光系数.电化学测试表明PCBRh的最低未占轨道(LUMO)能级比PCBM高0.1eV,这是由绕丹宁基团的给电子作用引起的.将PCBRh作为受体光伏材料与聚己基噻吩(P3HT)共混构建出体相异质结太阳能电池,在优化的制备工艺(P3HT/PCBRh=1:1(质量比),135℃热处理10min)下,电池器件的能量转换效率为1.46%.通过AFM表征研究退火处理对光活性层的形貌的影响及其与电池器件效率的联系:与参比P3HT:PCBM共混薄膜相比,退火处理使P3HT:PCBRh薄膜中的P3HT聚集成长度约为20nm的长条,并且粗糙度较大,因此不利于激子的扩散与分离.
The dye molecule 3-ethyl rhodanine was first connected to [6,6] -phenyl-C61-butyric acid methyl ester (PCBM) to synthesize a novel fullerene acceptor photovoltaic material PCBRh with enhanced optical absorption . The structure of PCBRh was confirmed by 1 H NMR, 13 C NMR and mass spectrometry. UV-Vis absorption spectra showed that the synthesized PCBRh had stronger optical absorption than PCBM at 300 ~ 600 nm, which was attributed to the 3- Electrochemical tests showed that the lowest unoccupied molecular orbital (LUMO) level of PCBRh was 0.1 eV higher than that of PCBM, which is caused by the electron donating action of the rhodanine group.Recently using PCBRh as the acceptor Photovoltaic materials were blended with polyhexylthiophene (P3HT) to form bulk heterojunction solar cells. The energy of the device was optimized with P3HT / PCBRh = 1: 1 (mass ratio) and heat treatment at 135 ℃ for 10 min. The conversion efficiency was 1.46%. The influence of annealing treatment on the morphology of photoactive layer and its relationship with cell device efficiency were studied by AFM characterization: Compared with the reference P3HT: PCBM blend film, P3HT aggregates into strips with a length of about 20 nm, and the roughness is large, which is not conducive to the exciton diffusion and separation.