Nitschke Paweł, Jarząbek Bożena, Damaceanu Mariana-Dana, Bejan Andra-Elena, Chaber Paweł
Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Skłodowska Str., 41-819 Zabrze, Poland.
Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 34 M. Curie-Skłodowska Str., 41-819 Zabrze, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2021 Mar 5;248:119242. doi: 10.1016/j.saa.2020.119242. Epub 2020 Nov 28.
The influence of presence and elongation of alkoxy side chains in the π-conjugated Schiff-bases has been considered on the basis of UV-Vis absorption and photoluminescence spectra of model compounds and polymers solutions in chloroform and binary solvents of different polarity. The results of these investigations have been supported by electrochemical data. It has been demonstrated that introduction of electron donating methoxy side groups decreases the energy gap, however the elongation of alkyl chains only slightly affects the electronic structure of model compounds. In the case of polymers, such octyloxy side chains improves the solubility, enabling formation of longer polymer chains, with the enhanced effective π-conjugation length and narrower energy gap, however the intensity of emission band clearly decreased. Positive solvatochromism has been observed in both absorbance and photoluminescence spectra for all investigated compounds. As the concluding task, bulk-heterojunction (BHJ) photovoltaic (PV) structures, consisting of polyazomethines blended with the fullerene derivative, [6,6]-phenyl-C-butyric acid methyl ester (PCBM) have been prepared and tested in the context of potential application in solar cells. All investigated polymers have shown the photovoltaic effect, but the best power conversion efficiency and other PV parameters have been obtained for polyazomthine with octyloxy side chains.
基于模型化合物和聚合物在氯仿以及不同极性二元溶剂中的紫外可见吸收光谱和光致发光光谱，研究了π共轭席夫碱中烷氧基侧链的存在和长度的影响。这些研究结果得到了电化学数据的支持。结果表明，引入供电子的甲氧基侧基会减小能隙，然而烷基链的延长对模型化合物的电子结构影响较小。对于聚合物而言，这种辛氧基侧链提高了溶解性，使得能够形成更长的聚合物链，有效π共轭长度增加且能隙变窄，然而发射带的强度明显降低。在所有研究的化合物的吸收光谱和光致发光光谱中均观察到了正溶剂化显色现象。作为最后的任务，制备了由聚甲亚胺与富勒烯衍生物[6,6]-苯基-C-丁酸甲酯（PCBM）混合而成的本体异质结（BHJ）光伏（PV）结构，并在太阳能电池的潜在应用背景下进行了测试。所有研究的聚合物都表现出了光伏效应，但具有辛氧基侧链的聚甲亚胺获得了最佳的功率转换效率和其他光伏参数。
