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제124회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Structural features and their functions in surfactant-armoured methylammonium lead iodide perovskites for highly efficient and stable solar cells.

2019년 9월 20일 12시 02분 30초
KCS.O-7 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 10시 : 33분
KCS - Oral Presentation for 2019 DOW Korea Award
저자 및
Minsu Jung, Tae Joo Shin1, Jangwon Seo2, Gwisu Kim, Sang Il Seok*
School of Energy and Chemical Engineering, UNIST, Korea
1UNIST Central Research Facilities, UNIST, Korea
2Division of Advanced Materials, Korea Research Institute of Chemical Technology, Korea
Methylammonium lead iodide perovskites have limited practical applications due to a lack of stability under operating conditions. Environmental stability under heating has not yet been achieved, although recent studies modifying perovskites with long organic cations have reported the progress of stabilisation under humid conditions. In this work, we report the structural evolution of long alkylammonium-modified MAPbI3 and its functions for highly efficient and stable solar cells. As an encapsulating agent, octylammonium (OA) cation produced individual MAPbI3 grains in full armour without the formation of layered structures in contrast to butylammonium (BA) and phenethylammonium (PEA) cations. Our OA-armoured MAPbI3 achieved a stabilised power conversion efficiency of 20.1% without a deterioration of charge transport properties due to highly preferential orientation suppressing non-radiative recombination. The structural features also led to a much improved thermal stability at 85 ˚C in ambient atmosphere retaining 80% of the initial efficiency after 760 h without any encapsulation, as well as water tolerance. This work addresses widespread concerns associated with the photovoltaic efficiency and stability of MAPbI3 by exploring the inter-relationship between structural features and their functions in surfactant-modified perovskites.