Proceedings of International Conference on Perovskite Thin Film Photovoltaics, Photonics and Optoelectronics (ABXPV18PEROPTO)
Publication date: 11th December 2017
Organic-inorganic (hybrid) perovskites such as methylammonium lead halides are being intensively investigated for their applications in photovoltaics and more recently as emitters in light-emitting diodes (LEDs). In electroluminescent devices, the photoluminescence quantum yield (PLQY) of the emitter should be maximum at excitation fluence corresponding to the typical current densities used to drive the LEDs. Unfortunately, the PLQY of perovskites such as the green-emitting methylammonium lead bromide (MAPbBr3) is typically low for simple solution-processed thin films. Several strategies to enhance the PLQY of MAPbBr3 have been identified, in general with the goal of i) substantially reducing the grain size and ii) efficiently passivate the surface (trap) states. Vacuum deposition allows to process perovskite thin films with arbitrary stoichiometry and thickness, and typically leads to materials composed of very fine grains. In this work we present the dual source vacuum-deposition of MAPbBr3 films, correlating the structural and optical properties of the material with the deposition parameters (stoichiometry, thickness, etc.). In order to enhance the PLQY of the perovskite films, we also consider the use of passivating agents introduced by post-treatment or by using multiple source vacuum co-deposition. The electroluminescence properties are evaluated in vacuum-deposited multilayer LEDs using organic semiconductors and metal oxides as the charge injection/transport layers.
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