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Preparation of Nanocuboid Perovskite CH3NH3PbI3 Thin Films with Controlled Grain Size, Morphology and Phase Purity

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In this work we prepared nanocuboid perovskite CH3NH3PbI3 thin films by using sequential two-step solution method, and tried to control the grain size, morphology and phase purity by controlling the diffusion behavior of CH3NH3I in PbI2. Our experimental results indicate that the diffusion behavior of CH3NH3I in PbI2 can be effectively controlled by adjusting the concentration of CH3NH3I solution and immersing temperature, and thus the grain size, morphology and phase purity were controllable. The formation dynamics of perovskite was discussed and the impact of grain size, morphology and purity on the transport and photoelectric properties of the films were investigated. The results show that the surface uniformity and the CH3NH3PbI3 phase purity are crucial for achieving high carrier lifetime, high photoconductivity and fast extraction of the photo-induced carriers across the perovskite/HTM (hole transport materials) interface. When the optimized CH3NH3PbI3 thin film which was prepared using CH3NH3I solution with concentration of 10 mg/ml at 70 °C was interfaced with Spiro-MeOTAD, the life time as short as 0.31 ns was achieved, indicating the very efficient extraction of the photo-induced carriers across the perovskite/HTM interface.
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Keywords: CONTROLLABLE PREPARATION; NANOCUBOID CH3NH3PBI3 THIN FILM; TRANSPORT AND PHOTOELECTRIC PROPERTY

Document Type: Short Communication

Publication date: March 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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