Photoinduced Giant Dielectric Constant in Lead Halide Perovskite Solar Cells

被引:631
作者
Juarez-Perez, Emilio J. [1 ]
Sanchez, Rafael S. [1 ]
Badia, Laura [1 ]
Garcia-Belmonte, Germa [1 ]
Kang, Yong Soo [2 ]
Mora-Sero, Ivan [1 ]
Bisquert, Juan [1 ,3 ]
机构
[1] Univ Jaume 1, Dept Fis, Photovolta & Optoelect Devices Grp, Castellon de La Plana 12071, Spain
[2] Hanyang Univ, Dept Energy Engn, Ctr Next Generat Dye Sensitized Solar Cells, Seoul 133791, South Korea
[3] King Abdulaziz Univ, Dept Chem, Fac Sci, Jeddah 21589, Saudi Arabia
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2014年 / 5卷 / 13期
基金
新加坡国家研究基金会;
关键词
HIGH-PERFORMANCE; LOW-COST; TEMPERATURE; MOBILITIES;
D O I
10.1021/jz5011169
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Organic-inorganic lead trihalide perovskites have emerged as an outstanding photovoltaic material that demonstrated a high 17.9% conversion efficiency of sunlight to electricity in a short time. We have found a giant dielectric constant (GDC) phenomenon in these materials consisting on a low frequency dielectric constant in the dark of the order of epsilon(0) = 1000. We also found an unprecedented behavior in which epsilon(0) further increases under illumination or by charge injection at applied bias. We observe that Eo increases nearly linearly with the illumination intensity up to an additional factor 1000 under 1 sun. Measurement of a variety of samples of different morphologies, compositions, and different types of contacts shows that the GDC is an intrinsic property of MAPbX(3) (MA = CH3NH3+). We hypothesize that the large dielectric response is induced by structural fluctuations. Photoinduced carriers modify the local unit cell equilibrium and change the polarizability, assisted by the freedom of rotation of MA. The study opens a way for the understanding of a key aspect of the photovoltaic operation of high efficiency perovskite solar cells.
引用
收藏
页码:2390 / 2394
页数:5
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