Preparation of Mixed-Cation-Halide Perovskite as Light Absorber Layer in Photovoltaic Cells
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Abstract
The purposes of this research are to study the crystal structure of perovskite thin film, to study the characteristics of light absorption and energy gap of perovskite thin film, to study the morphology and physical surface characteristics of perovskite thin film, to study the existence of trace elements on sample surface of perovskite thin film and to study variation of elemental composition of the perovskite thin film with the power conversion of solar cells. We used (MAPbI3)x(MAPbBr3)1-x and (MAPbI3)x(FAPbBr3)1-x, at x = 1.0, 0.8, 0.6, 0.4, 0.2 and 0.0, as light-absorbing layers. In order to study the effect of the composition variation of the perovskite material all devices consisted of the same electron transport layer material and hole transport material. Thin films were prepared by spin coating technique. After the experiment, the results showed that (1) the crystal structure of the perovskite thin film contained PbI2 and PbBr2 due to the unreacted precursors. (2) Perovskite thin films absorbed light in the visible region which is suitable for solar cells application. (3) Iodide perovskite had spike-shape morphology, while mixed halide perovskite thin films had particle-like morphology. (4) Elemental ratios of the perovskite thin films were consistent with the prepared precursors. (5) Perovskite solar cells made of (MAPbI3)0.8(FAPbBr3)0.2 film provided highest efficiency due to suitable light absorption in the visible region, appropriate energy gap and uniform surface. These are good combinations for solar cell applications.
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