Scaffold and annealing engineering for high crystallinity of CH3NH3PbI3 for perovskite solar cell
Yuji Wada a, Shuntaro Tsubaki a, Daikichi Iso b, Akito Tateyama b, Masato Maitani b, Guifang Han c, Pablo P. Boix c, Nripan Mathews c, Junbeom Kim d, Hiroshi Segawa e
a Energy Research Institute, Nanyang Technoological University, 50 Nanyang Drive
b Department of Chemical and Biological Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, Korea, Republic of
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, Shuntaro Tsubaki, 045
Publication date: 7th November 2016

In printable and low-cost next-generation solar cells, perovskite solar cell has gathered large attention these years for its high efficiency (> ~22%) in addition to ease of fabrication with low-cost materials.  To achieve the sufficient device reproducibility, uniformity, and reliability in the long-time use, many scientific and practical issues still remain.  Furthermore, higher efficiency is still required with large active area for the commercial applications. In this study, we focus on the scientific understanding of 1) perovskite/scaffold interface and 2) annealing process potentially affecting to the crystallization of CH3NH3PbI3 for perovskite solar cell.  Firstly, we present the facet chemistry of TiO2 scaffold with utilizing specific facet-dominant TiO2 nanoparticles for constructing meso-porous scaffold for perovskite solar cells.  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 impedance spectroscopy including the characterization of CH3NH3PbI3 perovskite crystals.  Secondary, we present the annealing effects on characterization of CH3NH3PbI3 perovskite crystals. We especially propose a microwave heating applied to the annealing process of to create the CH3NH3PbI3 perovskite crystalline films through the conversion of the intermediate state of as-coated precursor films into perovskite poly-crystalline films.  Observed rapid conversion process into perovskite crystals with higher crystallinity indicates that MW is potentially applicable for the rapid process of perovskite solar cell creation.  Furthermore, even the degradation of perovskite to be PbI2 by evaporation of methylammonium iodide at relatively lower temperature to the conventional hotplate heating imply a promising process to achieve novel high throughput annealing process at low-temperature.  The direct and effective heating effect by MW is discussed from the point of the crystallinity of CH3NH3PbI3.

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