Modulating the grain size, phase and optoelectronic quality of perovskite films with cesium iodide for high-performance solar cells

被引:21
作者
Sidhik, Siraj [1 ]
Cerdan Pasaran, Andrea [1 ,2 ]
Rosiles Perez, Christopher [1 ]
Lopez-Luke, Tzarara [1 ]
De la Rosa, Elder [1 ]
机构
[1] Ctr Invest Opt, AP 1-948, Leon 37150, Gto, Mexico
[2] Univ Nacl Autonomade Mexico, Inst Energias Renovables, Mlo 62580, Mexico
关键词
MIXED-HALIDE PEROVSKITE; CDS QUANTUM-DOT; CH3NH3PBI3; PEROVSKITE; EFFICIENCY; DEPOSITION; EVOLUTION; GROWTH; FABRICATION; MORPHOLOGY; HYSTERESIS;
D O I
10.1039/c8tc02923g
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The formation of smooth, dense, and uniform perovskite layers on substrates is crucial for achieving high-performance perovskite devices. Here, we show that the introduction of a small concentration of cesium iodide to the precursor solution has a considerable effect on the morphology, phase and optoelectronic properties of CH3NH3PbI3-based perovskite films. An optimized concentration of 3% produces a high-quality perovskite film with a large grain size of similar to 1.8 mu m and a root mean square roughness of 5.917 nm. The improved morphology and high optoelectronic quality of the perovskite layer were verified by SEM, AFM, XRD, and UV-visible, photoluminescence and electrochemical impedance spectroscopy. The defect-free thin perovskite layer enables the fabrication of a mesoscopic CH3NH3PbI3-based perovskite device under ambient conditions, with a maximum power conversion efficiency of similar to 19% with negligible hysteresis and high reproducibility. This method can be extended to other complexes of perovskite used in the present state-of-the-art perovskite solar cells.
引用
收藏
页码:7880 / 7889
页数:10
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