Interface Engineering by Facet Controlled TiO2 for CH3NH3PbI3 Perovskite Solar Cells
Hiroshi Segawa a, Masato Maitani a, Akito Tateyama b, Yuji Wada b
a Tokyo Institute of Technology, 2-12-1 Oookayama, Meguro-ku, Tokyo, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Yokohama-shi, Japan, 2017 February 2nd - 4th
Organizers: Tsutomu Miyasaka and Iván Mora-Seró
Poster 062
Publication date: 7th November 2016

In printable and low-cost next-generation solar cells, perovskite solar cells, the interface engineering is considered as the next key technology for improving the cell efficiency and long-term stability of device.  As TiO2 is the most commonly used material for the oxide scaffold layer, our interest focuses on controlling TiO2 surface to engineer the crystallization and electron transfer properties at the interface of scaffold/perovskite.  In this presentation, we especially focus on the facet chemistry of the oxide scaffold, and we report a few recent studies of perovskite solar cells with utilizing the facet chemistry of oxide scaffold.  In our studies, the single crystal of the facet oriented TiO2 and specific facet-dominant TiO2 nanoparticles are utilized for constructing a model system and device configuration, respectively.  In the model system, the affinity of component of perovskite , Pb and Cl, revealed the difference among each facet of TiO2, and therefore suggests that the facet control of scaffold is an important factor for the film formation and ultimately the device properties.  Furthermore, the solar cell properties with specific facet dominant anatase TiO2 scaffold  is discussed in detail with regarding the electron transport properties measured by a series of photoelectrochemical measurements.  

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