论文部分内容阅读
设计合成了3种可溶液加工的基于噻吩给体和2-吡喃-4-亚基丙二氰(PM)受体的新型Donor-Acceptor-Donor(D-A-D)型有机小分子TPT-N,TPT-S和TPT-D.研究了噻吩给体单元上烷基链的数目对分子的溶解性、光物理(吸收特性)、热稳定和光电性能的影响.结果表明,随着烷基链的增加,分子的溶解性增加,成膜性能提高;分子在溶液中的吸收光谱发生红移,薄膜的吸收谱带变窄,分子的最高占有分子轨道(HOMO)能级提高.以D-A-D型有机小分子为给体,富勒烯C60衍生物[6,6]-苯基-C61-丁酸甲酯(PCBM)为受体制备了结构为ITO/PEDOT∶PSS/D-A-D∶PCBM/LiF/Al的体异质结太阳能电池.研究结果表明,基于单烷基链的TPT-S的太阳能电池具有相对较高的能量转换效率.说明在D-A-D型有机小分子太阳能电池材料中,烷基链的数目是决定材料性能及器件性能的重要因素之一.
Three novel Donor-Acceptor-Donor (DAD) organic small molecule TPT-N based on thiophene donor and 2-pyran-4-ylidenepropylenediamine (PM) -S and TPT-D. The effects of the number of alkyl chains on thiophene donor units on the molecular solubility, photophysical (absorption), thermal stability and optical properties were investigated. The results showed that with the increase of alkyl chains , The solubility of the molecule increases, and the film-forming properties increase; the absorption spectrum of the molecule red-shifts in the solution, the absorption band of the film narrows, and the highest occupied molecular orbit (HOMO) level of the molecule increases. As a donor, a body of a fullerene C60 derivative [6,6] -phenyl-C61-butyric acid methyl ester (PCBM) was used as a receptor to prepare a structure of ITO / PEDOT: PSS / DAD: PCBM / LiF / Al Heterojunction solar cells.The results show that the single-alkyl-based TPT-S solar cells have a relatively high energy conversion efficiency.In the DAD type organic small molecule solar cell materials, the number of alkyl chains is decided Material properties and device performance is one of the important factors.