【摘要】 通过电场诱导表面光电压谱确定外围缩合4个1,10-啡啉单元的氮杂酞菁为p型有机半导体,并对各个谱带进行合理的归属.结果发现,Soret带长波侧光电压曲线在电场作用下轻微蓝移,根据电场对高极化度n轨道基态的影响,将其归属为n-π*跃迁.这一结果表明,光电属性与材料的分子结构和电子结构密切相关,为设计有机半导体模型提供了进一步的实验数据.更多还原

【Abstract】 In this paper an aza H₂Pc containing four 1,10-phenanthroline subunits was presented and its photoluminescence and photovoltage properties were investigated. For the same kind of electronic transition（π-π^* transition）, the photoluminescence and photovoltage exhibit competitive mechanism. Interestingly, the Soret-band SPV response is stronger than that of Q-band due to the four peripheral subunits. Based on the electric-field-induced surface photovoltage spectroscopy, the conduction type of the expanded aza H₂Pc was judged to be p-type. This contribution from the peripheral electron-withdrawing subunits comes with decreasing the electron-filling energy and facilitating the molecular oxidation. From the similar behavior, the Q-band and short wavelength side of Soret-band were assigned to π-π^* transition. Another intriguing aspect is that the long wavelength side of Soret-band exhibits a slight blue shift in the external electric field. According to the influence of electric field on the ground state of n-orbital with a high polarizability, it was assigned to n-π^* transition. The results indicate that the optoelectronic properties closely related to the molecular structure and the electronic structure, which provide further experimental data for developing an organic semiconductor model.更多还原