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Effects of guanidinium and formamidinium addition to CH3NH3PbI3-based perovskite solar cells
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1  Department of Materials Science, The University of Shiga Prefecture


Additive effects of guanidinium [C(NH2)3, GA] iodide, formamidinium [CH(NH2)2, FA] iodide, and guanidinium chloride to CH3NH3PbI3-based photovoltaic devices were investigated. Short-circuit current densities, open-circuit voltages, series resistances and shunt resistances were improved by the GA addition. The short-circuit current densities were increased by FA addition with GA, and the external quantum efficiencies increased, which results from the suppression of pin-holes in perovskite layers by GA addition. X-ray diffraction showed that the lattice constants of the perovskite crystals increased by the GA and FA addition, and that the GA substituted partially at the CH3NH3-site.

Keywords: perovskite; solar cell; photovoltaic device; guanidinium; formamidinium