Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
Organometal halide perovskites have attracted widespread attention as the favorable material for photovoltaic technology because of its high photoinduced charge separation and carrier transportation performance. The organometal halide perovskites have already shown remarkable results in solar cell application and their certified power conversion efficiency have reached up to 22.7%. However, in contrast to the dramatic accomplishments, it is also true that there are no clear elucidations about various extraordinary phenomena occurred in the organometal halide perovskite until now. To understand the unsolved puzzles of the organometal halide perovskite, precise crystallographic information of the organometal halide perovskite is essential because the organometal halide perovskite belongs to the crystal system. However, the microstructural investigation for crystal structure of the organometal halide perovskite has not been actively conducted. In this report, we reveal the real microstructural configuration of the organometal halide perovskite through transmission electron microscope observation.
For the crystallographic information of the organometal halide perovskite, planar type thin film perovskite solar cells (Au/Spiro-MeOTAD/MAPbI3/TiO2/FTO/Glass) containing a pure methylammonium lead iodide (MAPbI3) layer were fabricated through spin-coating method with antisolvent.
Different from previous reports indicating each phase of the organometal halide perovskite solely exists (orthorhombic phase < 165K < tetragonal phase < 327K < cubic phase), we observed that the tetragonal and cubic phases coexist at room temperature, and identified that superlattices constructed by a mixture of tetragonal and cubic phases are self-organized without a compositional change. Surprisingly, the superlattice enables that the organometal halide perovskite self-adjusts their microstructural configuration in context. We believe that the newly observed extraordinary structural characteristics of the organometal halide perovskite could be the origin of its unsolved problems and will shed new light on their new possibilities as promising materials for various applications.
This research has been supported by New Energy and Industrial Technology Development Organization (NEDO).
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