摘要
纳米Ti O2多孔薄膜中陷阱态的数量与分布可影响光致电子的传输与复合,进而影响染料敏化太阳电池(DSSCs)的性能.本文采用三电极体系,基于电化学阻抗谱(EIS)及循环伏安法(CV),研究了分别由10,20,80和200 nm Ti O2纳米颗粒组成的多孔薄膜中陷阱态的分布情况,结果表明,多孔薄膜中陷阱态的含量随颗粒的增大而减少.同时,光电子能谱(XPS)表征结果显示,多孔薄膜中Ti3+及氧空位的含量随颗粒增大有所减少.本研究工作为不同尺寸纳米颗粒的多孔薄膜对电池光伏性能影响提供了又一微观机制说明.
The number and distribution of trap states in nanoporous TiO2 thin films effect on the electron transport and recombination, and then affect the dye-sensitized solar cell （DSSCs） performance. This paper study the trap state number in nanoporous films composed of 10, 20, 80 and 200 nm TiO2 nanoparticles by means of three electrode system, based on the electrochemical impedance spectroscopy （EIS） and the cyclic voltammetry （CV）. The results show that the content of trap states decreases with the increase of particle size. And X-ray photoelectron spectroscopy （XPS） characterization shows that the content of Ti^3＋ and oxygen vacancies in the porous films decrease with the increase of particle size. The research provides a description of microscopic mechanism for the effect of porous films with different sizes on cell photovoltaic performances.
出处
《中国科学：化学》
CAS
CSCD
北大核心
2015年第6期649-654,共6页
SCIENTIA SINICA Chimica
基金
国家重点基础研究发展计划(2011CBA00700)
国家高技术研究计划(2011AA050527)
合肥物质科学中心发展计划(2012FXZY006)
国家自然科学基金(21173228)
中国博士后科学基金(2014M551825)资助
关键词
染料敏化太阳电池
多孔薄膜
陷阱态
dye-sensitized solar cell, nanoporous film, trap state
