2018年第79回応用物理学会秋季学術講演会

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12 有機分子・バイオエレクトロニクス » 12.5 有機太陽電池

[19a-432-1~12] 12.5 有機太陽電池

2018年9月19日(水) 09:00 〜 12:15 432 (432)

松島 敏則(九大)、白井 康裕(物材機構)

10:45 〜 11:00

[19a-432-7] High Performance Lead-Reduced Mixed-Cation Perovskite Solar Cells

〇(B)Yiying Li1、ShunHsiang Chan1、MingChung Wu1 (1.Chang Gung Univ.)

キーワード:mixed-cation perovskite solar cells, metal-doped perovskite, lead-reduced perovskite solar cells

Organic-inorganic lead halide perovskite solar cells (PSCs) have attracted tremendous interest in last six years with rapid progress in power conversion efficiencies (PCE) from 0.3% to 3.8% in 2006-2009 to the present record of 22.7%. Tuning composition of lead halide perovskite by introducing mixed cation have stabilized the solution process to make large uniform grains, which ultimately led to high efficiency and stability of solar cell. Using formamidinium lead triiodide (FAPbI3) instead of methylammonium lead triiodide (MAPbI3) is advantageous due to the reduced bandgap, which is closer to the single-junction optimum and would thus allow for higher solar light harvesting efficiency. Many types of metal ions were used to replace the Pb2+ to synthesize various metal-doped perovskite compounds, including Bi3+, Sn2+, Ca2+, Cu2+, Na+, K+ and Ba2+. Among these metal ions, Ba-doped perovskite structured materials can replace the lead without decreasing the photovoltaic performance. In this study, we combine mixed-cation with Ba-doped perovskite to fabricate high performance lead-reduced PSCs.
In summary, we try to increase the device performance by adding FA+ to MA+. As the concentration of MA0.8FA0.2 PbI3-yCly increases, the PCE will increase, and 1.7 M MA0.8FA0.2PbI3-yCly gives the best photovoltaic performance. To get high performance lead-reduced PSCs, we combine Ba2+ substitution of Pb2+ with 1.7 M MA0.8FA0.2 PbI3-yCly. When 5.0 mol% Ba2+ is doped, the best MA0.8FA0.2Ba0.05Pb0.95I3-yCly device gives Voc of 1.06 V, Jsc of 22.3 mA/cm2, FF of 70.4% and PCE of 16.6%.