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114th General Meeting of Korean Chemical Society Star-shaped hole transporting materials with a triazine unit for efficient perovskite solar cells

Submission Date :
8 / 28 / 2014 , 15 : 18 : 13
Abstract Number :
Presenting Type:
Poster Presentation
Presenting Area :
Authors :
도광석, 조현준1, 심장근2, 김기동1, 고재중*
고려대학교 소재화학과, Korea
1고려대학교 세종캠퍼스 소재화학과, Korea
2고려대학교 세종캠퍼스 신소재화학과, Korea
Assigned Code :
INOR.P-232 Assigend Code Guideline
Presenting Time :
10월 15일 (수요일) 16:00~19:00
ye-sensitized solar cells (DSSCs) have been considered a promising alternative to the silicon-based solar cells due to their low-cost production and simple device fabrication. DSSCs using liquid electrolytes of CoII/CoIII redox couples have shown efficiencies surpassing 12%. However, the stability issues of the DSSCs devices arise from leakage and evaporation of liquid electrolyte. Many efforts have been made to replace liquid electrolytes with quasi-solid-stateelectrolytes or solid-state hole conductors to alleviate the stability issues. However, the photovoltaic power conversion efficiency of solid-state DSSCs (ssDSSCs) remains significantly below that of liquid electrolyte-based devices. Recently, the organometal halide perovskites (CH3NH3PbX3, X = Cl, Br, I) have attracted great attention due to their direct band gap, large optical absorption and high mobility. An impressive photovoltaic performance was achieved over 15% power conversion efficiency using 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (spiro-OMeTAD) as a hole transporting material (HTM). The most effective HTM for the hybrid solar cells is spiro-OMeTAD, even though another small molecule HTMs such as 3,4-ethylenedioxythiophene-, pyrene-, linear π-conjugated structure, butadiene-, and swivel-cruciform thiophene- based HTMs gave high conversion efficiencies of 10~13%. However, the high synthetic cost of spiro-OMeTAD gives another problem for the commercialization. Therefore, the development of cost-effective HTMs with high efficiency and long stability is very important. We report new types of hole transporting materials with donor-π-acceptor (D-A) systems by incorporating an electron-deficient 1,3,5-triazine core and an electron-rich diphenylamino unit.