Impedance analysis of internal resistance affecting the photoelectrochemical performance of dye-sensitized solar cells
Impedance analysis of internal resistance affecting the photoelectrochemical performance of dye-sensitized solar cells
复制标题
DOI：
10.1149/1.1849776
复制
发表时间：
2005-01-01
影响因子：
3.9
通讯作者：
Eguchi, K
中科院分区：
文献类型：
--
作者：
Hoshikawa, T;Yamada, M;Eguchi, K
为了阐明染料敏化太阳能电池的性能与其内阻之间的关系，我们应用交流阻抗谱对电池进行分析。针对不同的电池组成和测量条件（例如不同种类的导电玻璃基板、两种对电极、煅烧温度、施加偏压和电极之间的距离）进行太阳能电池的阻抗和I-V测量；为了分离不同接口处出现的内阻。染料敏化太阳能电池的阻抗谱表明其内阻至少由五个部分组成。研究发现，导电玻璃基板的电阻表现为欧姆电阻，并且掺氟SnO2（FTO）/TiO2、TiO2/TiO2、Pt/电解质和TiO2/电解质界面处的电子转移被确定为决定染料敏化太阳能电池性能的内阻。 FTO/TiO2、Pt/电解质的内阻和导电玻璃的电阻影响填充因子。 TiO2/TiO2 和TiO2/电解质的内阻主要影响光电流。特别是，TiO2/电解质作为控制染料敏化太阳能电池光电流的界面具有重要意义。电解质扩散产生的阻抗对电池的性能影响很小。 (C) 2005 年电化学协会。
To clarify the relationships between the performance of dye-sensitized solar cells and their internal resistances, we applied ac impedance spectroscopy to the analysis of the cells. Impedance and I-V measurements of solar cells were carried out for various cell compositions and measurement conditions such as different kinds of conductive glass substrates, two kinds of counter electrodes, calcination temperature, applied bias, and distance between electrodes; in order to separate internal resistances which occur at different interfaces. Impedance spectra of dye-sensitized solar cells showed that their internal resistance consisted of at least five components. It was found that the resistance of a conductive glass substrate appeared as ohmic resistance, and that electron transfer at F-doped SnO2 (FTO)/TiO2, TiO2/TiO2, Pt/electrolyte, and TiO2/electrolyte interfaces was identified as the internal resistances determinative to the performance of dye-sensitized solar cells. Internal resistances at FTO/TiO2, Pt/electrolyte and the resistance of conductive glass affected the fill factor. Internal resistances at TiO2/TiO2 and TiO2/electrolyte mainly affected the photocurrent. Particularly, the TiO2/electrolyte was significant as the interface controlling photocurrent of the dye-sensitized solar cell. The impedance stemming from the diffusion of the electrolyte had little effect on the performance of the cells. (C) 2005 The Electrochemical Society.