Publication date: 1st July 2014
Great attention has recently been drawn to developing CH3NH3PbIxBr3-x perovskite solar cells because its bandgap can be continuously tuned from 1.63 to 2.3eV by chemically manage the composition of halide[1]. This makes CH3NH3PbIxBr3-x perovskite solar cells especially attractive for tandem application. However, solution processed deposition will results unreacted compounds which are defects in the active layer, and in turn, this will lead to low efficiency of the device. In this work we aim to develop high efficiency CH3NH3PbIxBr3-x solar cells by sequential process.
For the fabrication of perovskite solar cells, a better crystallinity and high purity film (less unreacted compounds-- MAX and PbX, X=I and Br) may be achieved by the sequential process compared to one-step solution process. In this study, PbX is deposited either via thermal evaporation or via spin coating, the CH3NH3PbIxBr3-x film is then formed by dipping the PbX coated sample into the MAX solution. Cells based on CH3NH3PbIxBr3-x and CH3NH3PbIxCl3-x perovskite will be characterised and compared. Their crystallinity and composition will be studied by XRD and EDX respectively. Their optical properties will be investigated by ellipsometry and absorption measurements.
These results will be presented and discussed at the conference.
Reference
[1] Feng, J. & Xiao, B. 2014, "Crystal structures, optical properties, and effective mass tensors of CH3NH3PbX3 (X = i and Br) phases predicted from HSE06", Journal of Physical Chemistry Letters, vol. 5, no. 7, pp. 1278-1282.
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