三元体异质结有机太阳能电池的研究
发布时间：2018-08-12 15:16
【摘要】：矿物能源的过度开采和使用已经给社会的发展带来了一系列的问题,例如能源短缺,温室效应,酸雨和雾霾等。有机太阳能电池是一种廉价的可再生能源,因其具有易制备,质量轻,柔性和原材料丰富等优点而受到了人们的广泛关注。三元体异质结有机太阳能电池通过在给受体主体系中掺杂近红外窄带隙材料,能够扩展有源层的吸收光谱的响应范围,从而提高有机太阳能电池的能量转换效率,这成为了近期的一个研究热点。本文分别研究了基于P3HT:PBDTTT-C:PC71BM体系和P3HT:DIB-SQ:PC71BM体系的三元体异质结有机太阳能电池。 通过在P3HT:PC71BM体系中掺杂窄带隙聚合物材料PBDTTT-C, P3HT:PC71BM二元体系的太阳能电池的性能得到了提升。当PBDTTT-C的掺杂浓度为6wt%时,有机太阳能电池的能量转换效率达到2.48%,比二元有机太阳能电池的性能提高了27%。有机太阳能电池能量转换效率提升的主要机理可以归因于通过在P3HT:PC71BM体系中掺杂PBDTTT-C,有源层的吸收光谱扩展到了近红外区域,平衡了光子的捕获和载流子的传输。众所周知,聚合物与聚合物混合的薄膜通常会出现宏观尺度或微观尺度的相分离,这不利于有机太阳能电池效率的提升。因此,在接下来的工作中我们研究了小分子材料DIB-SQ对P3HT:PC71BM体系太阳能电池性能的影响。通过掺杂1.2wt%的DIB-SQ,优化后的P3HT:PC71BM体系太阳能电池的能量转换效率从3.05%提升到3.72%,效率相应的提升了22%。我们测量了P3HT, DIB-SQ和P3HT:DIB-SQ溶液在700nm处的时间分辨瞬态光致发光光谱。P3HT溶液的在700nm处的寿命为0.9ns, DIB-SQ的为4.9ns,而P3HT:DIB-SQ的混合溶液则为6.2ns,这证明了P3HT与DIB-SQ分子之间存在能量传递过程。图41幅,表4个,参考文献106篇。
[Abstract]:Overexploitation and use of fossil energy has brought a series of problems to the development of society, such as energy shortage, Greenhouse Effect, acid rain and haze. Organic solar cell is a kind of cheap renewable energy, which is widely concerned because of its advantages of easy preparation, light weight, flexibility and abundant raw materials. By doping NIR narrow-band gap materials into the donor host system, the ternary heterojunction organic solar cells can expand the response range of the absorption spectra of the active layer, thus improving the energy conversion efficiency of the organic solar cells. This has become a research hotspot in the near future. In this paper, ternary heterojunction organic solar cells based on P3HT:PBDTTT-C:PC71BM system and P3HT:DIB-SQ:PC71BM system are studied. The performance of solar cells doped with narrow band gap polymer PBDTTT-C and P3HT:PC71BM binary system was improved. When the doping concentration of PBDTTT-C is 6 wt%, the energy conversion efficiency of organic solar cells reaches 2.48, which is 27.7% higher than that of binary organic solar cells. The main mechanism of improving the energy conversion efficiency of organic solar cells can be attributed to the fact that by doping PBDTTT-C in the P3HT:PC71BM system, the absorption spectra of the active layer extend to the near infrared region, balancing the capture of photons and the transport of carriers. It is well known that polymer / polymer mixed films usually present phase separation at macro or micro scale, which is not conducive to the improvement of the efficiency of organic solar cells. Therefore, in the following work, we studied the effect of small molecular material DIB-SQ on the performance of P3HT:PC71BM solar cells. By doping 1.2 wt% DIB-SQ, the energy conversion efficiency of the optimized P3HT:PC71BM solar cells is raised from 3.05% to 3.72%, and the efficiency is increased by 22%. The time-resolved transient photoluminescence spectra of P3HT, DIB-SQ and P3HT:DIB-SQ solutions at 700nm. The lifetime of P3HT solution at 700nm is 0.9ns, that of DIB-SQ solution is 4.9ns, and that of P3HT:DIB-SQ mixed solution is 6.2ns. it is proved that there is an energy transfer process between P3HT and DIB-SQ molecules. There are 41 figures, 4 tables and 106 references.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4
本文编号：2179452
[Abstract]:Overexploitation and use of fossil energy has brought a series of problems to the development of society, such as energy shortage, Greenhouse Effect, acid rain and haze. Organic solar cell is a kind of cheap renewable energy, which is widely concerned because of its advantages of easy preparation, light weight, flexibility and abundant raw materials. By doping NIR narrow-band gap materials into the donor host system, the ternary heterojunction organic solar cells can expand the response range of the absorption spectra of the active layer, thus improving the energy conversion efficiency of the organic solar cells. This has become a research hotspot in the near future. In this paper, ternary heterojunction organic solar cells based on P3HT:PBDTTT-C:PC71BM system and P3HT:DIB-SQ:PC71BM system are studied. The performance of solar cells doped with narrow band gap polymer PBDTTT-C and P3HT:PC71BM binary system was improved. When the doping concentration of PBDTTT-C is 6 wt%, the energy conversion efficiency of organic solar cells reaches 2.48, which is 27.7% higher than that of binary organic solar cells. The main mechanism of improving the energy conversion efficiency of organic solar cells can be attributed to the fact that by doping PBDTTT-C in the P3HT:PC71BM system, the absorption spectra of the active layer extend to the near infrared region, balancing the capture of photons and the transport of carriers. It is well known that polymer / polymer mixed films usually present phase separation at macro or micro scale, which is not conducive to the improvement of the efficiency of organic solar cells. Therefore, in the following work, we studied the effect of small molecular material DIB-SQ on the performance of P3HT:PC71BM solar cells. By doping 1.2 wt% DIB-SQ, the energy conversion efficiency of the optimized P3HT:PC71BM solar cells is raised from 3.05% to 3.72%, and the efficiency is increased by 22%. The time-resolved transient photoluminescence spectra of P3HT, DIB-SQ and P3HT:DIB-SQ solutions at 700nm. The lifetime of P3HT solution at 700nm is 0.9ns, that of DIB-SQ solution is 4.9ns, and that of P3HT:DIB-SQ mixed solution is 6.2ns. it is proved that there is an energy transfer process between P3HT and DIB-SQ molecules. There are 41 figures, 4 tables and 106 references.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM914.4
【参考文献】
相关期刊论文 前1条
1 卓祖亮;张福俊;许晓伟;王健;卢丽芳;徐征;;退火处理提高P3HT:PCBM聚合物太阳能电池光伏性能[J];物理化学学报;2011年04期
，本文编号：2179452
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