Enhancing the solar cell efficiency through pristine 1-dimentional SnO₂ nanostructures: Comparison of charge transport and carrier lifetime of SnO₂ particles vs. nanorods

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• 作者：Kosala Wijeratne^a ; Jeganathan Akilavasan^a ; Mukundan Thelakkat^b ; Jayasundera Bandara^a ; ^{jayasundera@yahoo.com}
• 关键词：SnO2 nanorods ; Dye-sensitized solar cell ; Charge transport ; 1-D structures ; Charge recombination
• 刊名：Electrochimica Acta
• 出版年：2012
• 期刊代码：30_00134686
• 类别：ch
• 出版时间：30 June, 2012
• 卷：72
• 期：Complete
• 页码：192-198
• 文件大小：794 K

摘要

Efficiency of dye-sensitized solar cells (DSSC) fabricated with pristine SnO₂ nanocrystals was reported to be less superior compared to DSSC based on mesoporous TiO₂ nanoparticles though both oxides have comparable electrical and surface properties. Owing to inherent high charge recombination properties of SnO₂ nanoparticles, photoanode fabricated with SnO₂ nanoparticles resulting in unexpected low open circuit voltage (V_oc) and fill factor (FF). To overcome inherent charge recombination in SnO₂, we investigated pristine SnO₂ nanorods and showed enhanced V_oc, FF and overall conversion efficiency (畏) for SnO₂ nanorods. The photoanode made of SnO₂ nanorods yields nearly a 2-fold improvement in fill factor, 5 fold increases in 畏 and a greater than 2-fold increase in short-circuit current density with a moderate increase in open-circuit photovoltage. The effects appear to arise primarily from longer electron lifetimes and reduced charge recombination of SnO₂ nanorod based solar cells compared to that of SnO₂ particles owing to 1-D nature of SnO₂ nanorod which were evaluated by open-circuit voltage decay (OCVD) and electrochemical impedance spectroscopy (EIS) methods.