叠氮烷烃环加成反应合成C60衍生物及其聚合物太阳电池的特性

通过烷基叠氮化合物与C₆₀的环加成反应合成了一系列以长链烷烃取代C₆₀的亚氨基衍生物,研究了其紫外-可见光吸收特性及电化学性质,并考察了由这些材料和聚2-甲氧基-5-(2-乙基己氧基)-1,4-对苯乙炔](MEH-PPV)制成的聚合物光电池的性能.这类器件的能量转换效率介于0.13～0.37之间,随着所接烷基链的增长和支链数目的增加,衍生物的溶解度逐步提高,器件的短路电流随着衍生物溶解度的提高而增加,最高可达到1.77mA/cm²,这类器件具有较极大的光暗比,有可能首先在传感器方面得到应用.

Synthesis of C60 Fullerene Derivatives by Azide Alkyl Cyclo-addition and Their Optoelectronic Performance

A series of imino C_~60 fullerene derivatives was synthesized through the cycloaddition reaction between C_~60 and a long chain alkyl azide. The electrochemical properties and UV-Vis absorption spectra of these compounds were investigated. Polymer photovoltaic cells with these imino C_~60 fullerene derivatives as the electron acceptor and MEH-PPV as the electron donor were fabricated and their performance was studied. The solubility in organic solvents and compatibility of these derivatives with conjugated polymer electron donor phase increases with the increasing of the length and number of alkyl linked to C_~60 fullerene core. The energy conversion efficiency(ECE) and the short circuit current(I_~sc ) also increase in the same sequence. The maximum short circuit current density(I_~sc ) reached 1.77 mA/cm2, close to that of the device fabricated from PCBM. Extremely high photo to dark current ratio makes these devices a good candidate for sensor application.