Effects of Facet-controlled Oxide Scaffold for Crystallinity of CH3NH3PbI3 in Perovskite Solar Cells

Yuji Wada^a, Masato Maitani^a

^aTokyo Institute of Technology, 2-12-1 Oookayama, Meguro-ku, Tokyo, Japan

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Oral, Masato Maitani, presentation 165
Publication date: 5th February 2015

The solid state printable “perovskite solar cell” is of large interest for not only its ease of fabrication and low-cost materials for low-cost solar cell, but also its high efficiency > ~20% potentially replacing the market of the silicon solar cells. Many of issues still remained such as the device reproducibility and reliability in the long-time use for the commercialization for the out-door-use photovoltaic applications in addition to the efficiency. In addition to these practical issues, the scientific understandings of the electron transfer properties, the energetic band alignment of layered configuration, device properties including hysteresis of I-V characteristics, and interface chemistry are desired for controlling the device properties and device process for the practical applications. We herein report the effects of the crystalline orientation of oxide semiconductors as the scaffold on the properties of deposited perovskite CH₃NH₃PbI₃ in order to achieve the better control of the perovskite deposition. We report a few recent results with TiO₂ single crystals exposing different facet determining the crystalline orientation of deposited perovskite CH₃NH₃PbI₃. A series of photoelectrochemical analyses reveals the effects of the facet of TiO₂ to the electron transport characteristics at the interfaces, electron injection. We found that the resulted photoluminescence differs in intensity depend on the facet of the oxide scaffold probably due to the difference of the interface of CH₃NH₃PbI₃ / TiO₂ or the difference in the carrier transport in CH₃NH₃PbI₃ attributed to the characteristic crystalline orientation of perovskite. Furthermore the different facet dominating TiO₂ and ZnO nanoparticles^1-3 are utilized as the scaffold of the perovskite solar cells with the deposition of CH₃NH₃PbI₃ by the spin coating process. The resulted solar cell properties will be discussed in detail with regarding the electron transport properties measured by a series of photoelectrochemical measurements. Additionally we propose the self-assembly of the anisotropic oxide nanoparticles for constructing a well-organized nanomorphology potentially applicable to the scaffold in order to control the crystalline orientation of the deposited perovskite on it to control the charge transport properties and the nanomorphology of charge transport path, which plays a key role of both the electron and hole transport in the solar cells.
Figure (a) Deposited CH3NH3PbI3 perovskite crystals on each crystalline facet of rutile TiO2 single crystal substrates. (b) Synthesized nanoparticles of the facet-controlled anatase TiO2 and ZnO utilized as the mesoporous scaffold of the perovskite solar cells.
1.Maitani M. M. et al. J. Phys. Chem. Lett. 2011, 2, 2655. 2.Cozzoli, P. D. et al. J. Am. Chem. Soc. 2003, 125, 14539. 3.Zhang X. et al. Sci. Rep. 2014, 4, 4596.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.