Publication date: 2nd November 2020
Hybrid organic/inorganic perovskite solar cells have emerged substantially in the solar community, considered as a remarkable alternative because of its low cost and its efficiency's fascinating rise in the last ten years1. Spin coating is so far the most used technique for elaborating perovskite solar cells, though it presents many constraints such as limited surface coverage, non-homogeneity, and undefined perovskite crystallinity. To avoid all the restrictions mentioned, electrodeposition could be used as a substitute technique2. Herein, electrodeposition of PbO2 was used as a first step for elaborating CH3NH3PbI3 perovskite layers. Then, conversion of PbO2 films into perovskite was conducted by immersion in CH3NH3I solutions (Figure 1). In this work, the impact of different electrodeposition parameters on both PbO2 and perovskite films was studied. The main interfering parameters are the applied voltage, electrodeposition time, the concentration and the pH of the electrolyte. Also, the effect of the substrate on the deposited films was observed by conducting the study on Glass/ITO, Glass/ITO/spincoatedSnO2 and Glass/ITO/elecrodepositedSnO2 substrates. Cyclic voltammetry, chronocoulometry, profilometry, UV-visible spectroscopy, X-Ray Diffraction and Scanning Electron Microscopy were all used to optimize the deposition parameters. In addition, ageing studies showed that the elaborated perovskite is more stable on electrodeposited SnO2 than on the spin-coated one. This study will also be conducted using mixed cation and halide perovskites to enhance the device performance and its long-term stability.
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