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大家好！我们很高兴邀请到美国北伊利诺大学Tao Xu 教授来纳米所进行学术交流访问。

报告题目：Three-Dimensional Nanoarchitectured Transparent Conducting Oxides for Photovoltaics

地点：A622

时间：6月20日（周四），上午10:00

主持：封心建  研究员

欢迎大家踊跃参加！

报告摘要：The photovoltaic (PV) materials in solar cells take multiple tasks including absorbing lights, separating the light-induced electron-hole pairs, and consequently transport charges to the corresponding metallic electrodes. These tasks, however, are often mutually conflicting. In particular, a thick PV layer is desired to absorb enough light for creating sufficient light-induced charges, while a thin PV layer is also desired to shorten the charge transport path length insider the PV layer in order to suppress recombination. Using dye-sensitized solar cells (DSSCs) as an exploratory platform, this dilemma is mitigated using a non-traditional 3-dimensional (3-D) highly doped fluorinated SnO2 (FTO, core)-TiO2(shell) nanostructured photoanodes, including nanoparticulate and nanoporous FTO(core)-TiO2(shell) architectures. The FTO core serves as conductive core for low-resistance and drift-assisted electron extraction. The thin, conformal and low-doped TiO2 shell layer is coated by atomic layer deposition (ALD), which provides a large area for anchoring dyes and maintains a large resistance against recombination. Current-voltage curves were studied and EIS (electrochemical impedance spectroscopy) reveals that the electron transit time is reduced by orders of magnitude, while the recombination resistance remains in the range of traditional nanoparticle TiO2 photoelectrodes.