High Resolution TEM Observation of MAPbI3 Perovskite Solar cells with Superlattice
Tae-Woong Kim a, Ludmila Cojocaru b, Satoshi Uchida a, Tomonori Matsushita a, Takashi Kondo a, Hiroshi Segawa a
a Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo, Japan
b Laboratory for Photovoltaic Energy Conversion, University of Freiburg
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV19)
Roma, Italy, 2019 May 12th - 15th
Organizers: Prashant Kamat, Filippo De Angelis and Aldo Di Carlo
Oral, Satoshi Uchida, presentation 040
DOI: https://doi.org/10.29363/nanoge.hopv.2019.040
Publication date: 11th February 2019

The microstructural observation analysis of the perovskite layer with high resolution TEM is the most promising approach to understand the crystal structure. Recently we newly revailed that the tetragonal and cubic phases coexist at room temperature in the conventional MAPbI3 thin film device. Furthermore superlattices composed of these mixture of tetragonal and cubic planes without any compositional change was also found. Formation of the superlattice is achieved by only intrinsic structural transition without artificial modifications and, therefore, most phenomena concerned with the structural superlattice are expected to spontaneously and automatically occur in context with situation. The organometal halide perovskite self-adjusts their microstructural configuration and self-organizes buffer layers inside crystal or at hetero-interface by introducing the self-assembled superlattices.  We believe, this report will be a vital cornerstone to bring the PCEs of the organometal halide perovskite solar cells one step closer to theoretical maximum point and redefine possibility of the organometal halide perovskite as promising materials for not only solar cell but also various applications.

The authors thank the New Energy and Industrial Technology Development Organization (NEDO, Japan) for nancial support.

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