Hou Jianhui, Tan Zhan'ao, Yan Yong, He Youjun, Yang Chunhe, Li Yongfang
CAS Key Laboratory of Organic Solids, Center for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, China.
J Am Chem Soc. 2006 Apr 12;128(14):4911-6. doi: 10.1021/ja060141m.
Three two-dimensional (2-D) conjugated polythiophenes with bi(thienylenevinylene) side chains (biTV-PTs), P1, P2, and P3, were designed and synthesized for application in polymer solar cells. The absorption spectral, electrochemical, and photovoltaic properties of the biTV-PTs were investigated and compared with those of poly(3-hexylthiophene) (P3HT). The biTV-PTs show a broad absorption band from 350 to 650 nm; especially, the absorption spectrum of P3 displays a broad plateau and much stronger absorbance than that of P3HT in the wavelength range from 350 to 480 nm. Cyclic voltammograms reveal that the onset oxidation and reduction potentials of the biTV-PTs positively shifted by ca. 0.2 V in comparison with those of P3HT, indicating that the HOMO energy level of the biTV-PTs is ca. 0.2 eV lower than that of P3HT. Polymer solar cells (PSCs) were fabricated based on the blend of the polymers and 1-(3-methoxycarbonyl)propyl-1-phenyl-[6,6]-C-61 (PCBM) with a weight ratio of 1:1. The open circuit voltage of the PSCs based on the biTV-PTs is ca. 0.1 V higher than that of P3HT, which is benefited from the lower HOMO levels of the biTV-PTs. The maximum power conversion efficiency (PCE) of the PSCs based on P3 reached 3.18% under AM 1.5, 100 mW/cm2, which is 38% increased in comparison with that (2.41%) of the devices based on P3HT under the same experimental conditions. The results indicate that the 2-D conjugated biTV-PTs are promising polymer photovoltaic materials.
设计并合成了三种带有双（噻吩基亚乙烯基）侧链（biTV-PTs）的二维（2-D）共轭聚噻吩P1、P2和P3，用于聚合物太阳能电池。研究了biTV-PTs的吸收光谱、电化学和光伏特性，并与聚（3-己基噻吩）（P3HT）的相应特性进行了比较。biTV-PTs在350至650 nm范围内呈现出宽吸收带；特别是，P3的吸收光谱在350至480 nm波长范围内呈现出一个宽平台，且吸光度比P3HT强得多。循环伏安图表明，与P3HT相比，biTV-PTs的起始氧化和还原电位正向偏移约0.2 V，这表明biTV-PTs的最高占据分子轨道（HOMO）能级比P3HT低约0.2 eV。基于聚合物与1-(3-甲氧羰基)丙基-1-苯基-[6,6]-C-61（PCBM）以1:1重量比的共混物制备了聚合物太阳能电池（PSC）。基于biTV-PTs的PSC的开路电压比P3HT的开路电压高约0.1 V，这得益于biTV-PTs较低的HOMO能级。在AM 1.5、100 mW/cm²条件下，基于P3的PSC的最大功率转换效率（PCE）达到3.18%，与相同实验条件下基于P3HT的器件的效率（2.41%）相比提高了38%。结果表明，二维共轭biTV-PTs是很有前景的聚合物光伏材料。
