Perovskite (CH3NH3PbI3) solar cells have demonstrated great promise in the development of economical, photovoltaic materials.Their organic-inorganic framework has proved to illustrate high current efficiencies up to 20% [1]. This study highlights three variables, namely concentration of both perovskite precursors, lead iodide (PbI2) and methyl ammonium iodide (MAI), annealing temperature of MAI for perovskite formation, and varying temperature of MAI solution before the deposition. The perovskite layer was deposited using a two-step deposition method and a 1:1 ratio of PbI2 and MAI. A pipet sliding technique was used to deposit uniform layers and ensure even coverage. As concentration of solutions were increased, we observed a thicker film by cross sectional SEM and higher visible light absorption by solid state UV-Vis absorption. We observed optimal annealing temperature of perovskite around 60°C and optimal MAI solution temperature at 60°C. We found highest efficiency cells were made using a two-step deposition of 0.2 M perovskite with an MAI solution temperature and annealing temperature of 60°C. Future work will involve altering the deposition technique to improve film homogeneity and reproducibility.

Fabrication and characterization of solution processed perovskite solar cells by undergraduates at California State University, Chico

253rd National Meeting (2017)

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