An Inorganic Hole Conductor for Organo-Lead Halide Perovskite Solar Cells. Improved Hole Conductivity with Copper Iodide

被引:1182
作者
Christians, Jeffrey A. [1 ,2 ]
Fung, Raymond C. M. [1 ]
Kamat, Prashant V. [1 ,2 ,3 ]
机构
[1] Univ Notre Dame, Radiat Lab, Notre Dame, IN 46556 USA
[2] Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
[3] Univ Notre Dame, Dept Chem & Biochem, Notre Dame, IN 46556 USA
关键词
ELECTRICAL-CONDUCTIVITY; LOW-COST; EFFICIENT; RECOMBINATION; ABSORBER; TRANSPORT; BALANCE; CUSCN;
D O I
10.1021/ja411014k
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Organo-lead halide perovskite solar cells have emerged as one of the most promising candidates for the next generation of solar cells. To date, these perovskite thin film solar cells have exclusively employed organic hole conducting polymers which are often expensive and have low hole mobility. In a quest to explore new inorganic hole conducting materials for these perovskite-based thin film photovoltaics, we have identified copper iodide as a possible alternative. Using copper iodide, we have succeeded in achieving a, promising power conversion efficiency of 6.0% with excellent photo-current stability. The open-circuit voltage, compared to the best spiro-OMeTAD devices, remains low and is attributed to higher recombination in CuI devices as determined by impedance spectroscopy. However, impedance spectroscopy revealed that CuI exhibits 2 orders of magnitude higher electrical conductivity than spiro-OMeTAD which allows for significantly higher fill factors. Reducing the recombination in these devices could render CuI as a cost-effective competitor to spiro-OMeTAD in perovskite solar cells.
引用
收藏
页码:758 / 764
页数:7
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