【摘要】 通过在N719敏化的纳米晶二氧化钛膜上耦合SiO₂ Opal光子晶体,以此复合膜为光阳极,以敏化二氧化钛与无序SiO₂的复合膜为参比膜,考察了SiO₂ Opal光子晶体结构周期数对电池光电性能的影响。SiO₂ Opal光子晶体的结构周期数由制备光子晶体时的沉积液浓度控制。实验结果表明复合光子晶体后,电池的短路电流密度ISC和能量转化效率Eff明显提高,且光子晶体周期数越多,提高率越大,当SiO₂ Opal结构周期数增加至20层时,ISC和Eff与参比膜相比分别增加了91%和164%。IPCE分析表明光电性能提高的原因在于当光子晶体带隙与N719吸收峰重合时,利用光子带隙反射与光局域效应可提高N719对波长530nm光的吸收率。即光子晶体可有效提高吸光材料在光子带隙处的吸光率,且随着光子周期数增加,提升效果越显著。更多还原

【Abstract】 The effect of photonic-crystals（ PC） periodicity on the photoelectric performance of dye-sensitized solar cells was studied. The anodes of solar cells was the N719 dye-sensitized nanocrystalline TiO₂ film which was coupled with one layer of SiO₂ Opal PC with different periodicity. The periodicity of SiO₂ PC was controlled by the concentration of silica suspension in vertical deposition. It was shown that the Short circuit current density（ISC）and the energy conversion efficiency（Eff）of the DSSC increased with the SiO₂ PCs periodicity. When the SiO₂ Opal increased to 20 layers,compared with reference film,ISCand Eff increased by 91% and 164%,respectively. The results of IPCE analysis indicated that the improved performance of DSSCs was mainly attributed to the enhanced light-harvest of the N719 dye near 530 nm by the light reflection at photonic band gap and photon localization of SiO₂ Opal. The Photonic crystal can effectively improve the light-harvest at the photonic band gap. The more the periodicity of the PC is,the stronger the effect of its photon localization is.更多还原