Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
We have fabricated perovskite solar cell based on formamidinium lead iodide (HC(NH2)2PbI3) formed by two-step dipping method. PbI2 was spin-coated on the compact blocking layer coated FTO substrate, which was followed by dipping in the 2-propanol solution of HC(NH2)2I. Morphology of the resulting HC(NH2)2PbI3 was found to be dependent on the HC(NH2)2I concentration. Low concentration of 40.7 mM led to large size with dimension of about 900 nm, while high concentration of 58.2 mM produced relatively small size of about 280 nm. Island-like perovskite was formed on the substrate from low concentration, leaving uncovered blocking layer surface, whereas small sized perovskite covered fully the blocking layer from high concentration. The planar heterojunction devices were fabricated by depositing spito-MeOTAD on the perovskite layer. Photovoltaic performance was found to be significantly affected by change in the HC(NH2)2I concentration. As the concentration decreased from 58.2 mM to 40.7 mM, thereby size increased from 280 nm to 900 nm nm, short-circuit current density (JSC) and fill factor (FF) increased from 17.72 mA/cm2 to 18.95 mA/cm2 and from 0.44 to 0.58, respectively, which eventually led to improvement of power conversion efficiency from 7.72% to 10.73%. The improved JSC and FF were related to better light harvesting at longer wavelength, associated with larger size, and lower series resistance, associated with less grain boundaries. Since hole mobility is likely to be influenced by perovskite morphology, morphology-hole relationship is under study.
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