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Department of Materials Science, the University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan





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Academic Editor: Narottam Das

Abstract Fabrication and characterization of CH3NH3PbI3−x−yBrxCly perovskite solar cells using mesoporous TiO2 as electron transporting layer and 2,2′,7,7′-tetrakis-N,N-di-4-methoxyphenylamino-9,9′-spirobifluorene as a hole-transporting layer HTL were performed. The purpose of the present study is to investigate role of halogen doping using iodine I, bromine Br and chlorine Cl compounds as dopant on the photovoltaic performance and microstructures of CH3NH3PbI3−x−yBrxCly perovskite solar cells. The X-ray diffraction identified a slight decrease of crystal spacing in the perovskite crystal structure doped with a small amount of I, Br, and Cl in the perovskite compounds. Scanning electron microscopy SEM and energy dispersive X-ray spectroscopy EDX showed the perovskite crystal behavior depended on molar ratio of halogen of Pb, I, Br and Cl. Incorporation of the halogen doping into the perovskite crystal structure improved photo generation, carrier diffusion without carrier recombination in the perovskite layer and optimization of electronic structure related with the photovoltaic parameters of open-circuit voltage, short-circuit current density and conversion efficiency. The energy diagram and photovoltaic mechanisms of the perovskite solar cells were discussed in the context of the experimental results. View Full-Text

Keywords: photovoltaic property; perovskite; solar cell; crystal structure; microstructure photovoltaic property; perovskite; solar cell; crystal structure; microstructure





Autor: Atsushi Suzuki * , Hiroshi Okada and Takeo Oku

Fuente: http://mdpi.com/



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