Toward Antimony Selenide Sensitized Solar Cells: Efficient Charge Photogeneration at spiro-OMeTAD/Sb2Se3/Metal Oxide Heterojunctions

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• 作者：N茅stor Guijarro ; Thierry Lutz ; Teresa Lana-Villarreal ; Flannan O鈥橫ahony ; Roberto G贸mez ; Saif A. Haque
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：May 17, 2012
• 年：2012
• 卷：3
• 期：10
• 页码：1351-1356
• 全文大小：331K
• 年卷期：v.3,no.10(May 17, 2012)
• ISSN：1948-7185

文摘

Photovoltaic devices comprising metal chalcogenide nanocrystals as light-harvesting components are emerging as a promising power-generation technology. Here, we report a strategy to evenly deposit Sb₂Se₃ nanoparticles on mesoporous TiO₂ as confirmed by Raman spectroscopy, energy-dispersive X-ray spectrometry, and transmission electron microscopy. Detailed study of the interfacial charge transfer dynamics by means of transient absorption spectroscopy provides evidence of electron injection across the Sb₂Se₃/TiO₂ interface upon illumination, which can be improved 3-fold by annealing at low temperatures. Following addition of the spiro-OMeTAD hole transporting material, regeneration yields exceeding 80% are achieved, and the lifetime of the charge separated species is found to be on the millisecond time scale (蟿_50% 50 ms). These findings are discussed with respect to the design of solid-state Sb₂Se₃ sensitized solar cells.

Keywords:

charge separation; transient absorption spectroscopy; SILAR; quantum dot; solar cell; dye-sensitized solar cells; nanoparticles