The influence of dichlorobenzene / chlorobenzene ( DCB / CB ) containing electron transport layer ( [6,6]-phenyl-C61-butyric acid methyl ester, PC61BM ) precursor solution on the structural and optical properties of perovskite-based ( CH3NH3PbBr3 ) optoelectronic devices

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Nowadays, the photovoltaic efficiency of perovskite-based solar cells has been boost up to the value of more than 20%; experimentally, owing to low manufacturing cost and simple process, the feasibility of mass production of such cells becomes anticipated. In addition to being used in renewable energy fields, they can also be used for optoelectronic devices as material engineering is conducted to optimize the grain size of perovskite-based thin films with reduced defect density. The structure of perovskite device in research is ITO / PEDOT:PSS / Perovskite / PC61BM / Ag. We shall devote to improve the luminous efficiency of perovskite-based LEDs through optimizing the structural properties of perovskite thin films with reduced defect density. In addition, the interfacial behavior between the electron injection layer and the perovskite thin film can be reinforced through solvent annealing processes. In the experiment, several facilities such as scanning electron microscope, X-ray diffractometer, and electroluminescence spectrum will be used to investigate the optical, electrical, structural and excitonic properties of perovskite-based thin films synthesized with different electron transport layer PC61BM precursor solution processes. When the electron transport layer PC61BM precursor solution contains 10% dichlorobenzene, showing the best film, photoelectric properties and the best crystal quality; the maximum current density of 5.16 mA / cm2, with the smallest ideal factor and series resistance were 10.5670Ω and 41.611Ω, and the maximum luminous brightness of 9.3x10-4cd / m2.