Abstract
Molecularly engineered, low cost cyanine dye was synthesized and used as hole transport layer (HTL) for Perovskite solar cells. The photo-physical properties were studied using solutions and films of pristine as well as hybrid/film structure of cyanine with PbI2. UV-Vis spectroscopy of the cyanine-PbI2 hybrid material reveals a strong coupling between the chromophores in the solid state. Perovskite solar cells were fabricated using either spiro-OMeTAD or cyanine as dopant free HTL. In case of Spiro-OMeTAD as dopant free HTL, PCE of 9.91% was achieved with V oc of 1.02 V, J sc of 22.3 mA/cm2, and FF of 0.43. On the other hand using cyanine as HTL affords a large enhancement of PCE (15.4 %) as well as other cell parameters including V oc (1.12 V), J sc (21.2 mA/cm2), and in particular FF (0.65), due to reduction of charge recombination in addition to the improved charge collection and transporting using Cyanine HTL.
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