Publication date: 14th December 2015
Various structures of lead halide perovskite solar cells have rapidly risen to the forefront of emerging photovoltaic technologies, owing to their rapidly increasing efficiencies. In parallel with device fabrication and optimization in the lab, to pave the way for commercialization of these solution-processed solar cells, we have developed modified versions of controlled drop-casting and spray coating methods combined with ultrasonic vibration imposed on the substrate. The developed methods, i.e., the substrate vibration-assisted spray coating (SVASC) and substrate vibration-assisted drop-casting (SVADC) were used for the deposition of CH3NH3PbI3-xClx mixed halide perovskite thin films and other solution-processed layers in a planar heterojunction solar cell (FTO/PEDOT:PSS/CH3NH3PbI3-xClx/PCBM/Al). The simple devices made using these scalable methods have so far shown efficiencies up to about 6%. Device and process optimization is being undertaken to further improve the power conversion efficiency. In this poster, the principle and merit of the developed casting methods for the fabrication of perovskite solar cells is discussed. Results on the optimization of the perovskite layer are presented as well.
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