动态复合对染料敏化太阳电池性能的影响

本文通过设计一种特殊的电池结构，动态改变电解液与导电玻璃（Tc0）的接触面积，固定Ti02薄膜面积，将TCO／OL解液界面与TiO2／电解液界面两种复合途径进行区分，从实验和理论两方面研究了复合途径变化对染料敏化太阳电池（DSC）性能的影响．采用电化学阻抗谱（EIS）表征界面电荷交换过程，研究了不同途径在复合中的作用机理．通过单色光下，1-V性能测试，对不同界面复合主导下的DSC二极管特性进行数值分析，探讨了复合过程中界面电荷交换变化对光电压（‰）的影响．研究结果表明，高光强下（Voc=700mV）改变TCO／电解液接触面积对复合影响不明显，DSC电子复合主要经由TiO2／电解液界面，电池具有明显的二极管特征；而弱光下（Voc〈400mV）增加TCO／电解液接触面积将使复合大幅增加，此时电荷交换由TCO／电解液界面主导，电池填充因子大幅降低，整流作用减弱．由于TCO／OL解液界面电荷交换明显慢于TiO2／电解液界面，通过同一电池一定光强范围内的光电压变化对比发现，高光强下光电压变化较慢，而弱光下光电压变化较快．

Influence of dynamic recombination on dye-sensitized solar cells performances

As a primary component to influence dye-sensitized solar cells （DSC） performance, the role of electron recombination has been widely researched. In this work, a special cell structure is developed in terms of isolating the charge transfer processes via conducting glass substrate or TiO2 films, which enable us to investigate the contributions of the two recombination pathways on recombination and their further influences on interfaces properties and photovoltaic performances. The diode characteristics of DSC under different illuminations are proposed by numerical calculus. It is found that the recombination occurred mainly through TiO2/electrolyte interface under high illumination intensities （Voc ~ 700 mV） and the diode behavior is evidently observed. On the other hand, this character is sharply weakened and the recombination via TCO/electrolyte interface is dominant under low illumination intensities （Voc 〈 400 mV）. Furthermore, the relation between photovoltage and light intensities indicate that a back reaction via substrate is indeed varying less rapidly with photovoltage than reaction via the conduction band, which lead to a slow variation of photovoltage under high intensities and a rapid variation under low intensities, respectively.