降低有机光伏材料成本是实现有机太阳能电池工业化生产迫切需要解决的问题.本研究设计合成了一种结构简单、合成成本低的三嗪基缺电子单元(BTTz),与易于获得的3,3′-二氟联噻吩(DFT)给电子单元共聚,开发了一种新型宽带隙聚合物给体材料聚[(2,6-(3,3′-二氟)二噻吩)-alt-(2,4-双(4-(2-丁基辛基)噻吩-2-基)-6-甲氧基-1,3,5-三嗪)](PDFBTTz).通过热重分析、紫外-可见吸收光谱法和循环伏安法对其特性进行表征,聚合物PDFBTTz展现出适当的吸收范围(350~600 nm),宽的光学带隙(2.06 eV),以及合适的最高占据分子轨道能级(-5.49 eV).基于聚合物PDFBTTz优异的光物理性质,选取具有能级匹配和吸收光谱互补的IT-4F作为受体材料,制备的有机太阳能电池器件能量转化效率为3.49%,其开路电压为0.75 V,短路电流密度为10.89 mA·cm-2,填充因子为43.36%.上述结果表明BTTz是构筑宽带隙聚合物的有效缺电子单元,同时对该单元进行合理的结构裁剪有望获得更高效的聚合物给体材料.
Reducing the costs of photovoltaic material of organic solar cells is an urgent problem to be solved for their industrial production.Here we synthesized a triazine-based electron-deficient building block(BTTz)with a simple structure and low synthetic costs,and then developed a novel wide-bandgap polymer donor poly 2,6-(3,3′-difluoro)bithiophene-alt-2,4-bis(4-(2-butyloctyl)thiophen-2-yl)-6-methoxy-1,3,5-triazine(PDFBTTz)by combining with easily available 3,3'-difluoro-2,2'-bithiophene(DFT).It was characterized by thermogravimetric analysis,ultraviolet-visible absorption spectroscopy and cyclic voltammetry,etc.Results showed that the PDFBTTz exhibits an absorption range of 350-600 nm with a wide bandgap about 2.06 eV and a suitable highest occupied molecular orbit energy level(-5.49 eV),which are complementary with those of small-molecule electron acceptor IT-4F.As a result,the PDFBTTz-based polymer solar cell shows a modest power conversion efficiency of 3.49%with open-circuit voltage of 0.75 V,a short-circuit current density of 10.89 mA·cm-2,and a filling factor of 43.36%.These results indicate that the BTTz is a promising building block to construct wide-bandgap polymers,and further adjustment of molecular structure is expected to generate more efficient polymer donor materials.
冯继宝;朱晓东;高建宏;刘治田
武汉工程大学材料科学与工程学院,湖北 武汉 430205
政治法律
聚合物太阳能电池;光伏性能;聚合物给体材料;三嗪缺电子单元
polymer solar cell;photovoltaic performance;polymer donor material;triazine-based electron-deficient unit
《武汉工程大学学报》 2024 (002)
148-154,236 / 8
国家自然科学基金(52003209)
10.19843/j.cnki.CN42-1779/TQ.202301004
评论