Improved morphology and enhanced stability via solvent engineering for planar heterojunction perovskite solar cells

• Low temperature processes under 120 °C on ITO/PEDOT:PSS substrate.
• Morphological changes with uniform crystals due to solvent engineering.
• Enhanced morphology and Less chances of recombination due to solvent egneernig.
• High PCE of 9.2% was recorded with solvent engineering.
• Low PCE of 8.01% was recorded without solvent engineering.
• 100 days of environmental stability was noticed in solvent engineered samples.

Solvent engineering technique for planar heterojunction perovskite solar cells is an efficient way to achieve uniformly controlled grain morphology for perovskite films. In this report, diethyl ether solvent engineering technique was used for Methyl ammonium lead triiodide (CH3NH3PbI3) perovskite thin films for planar heterojunction solar cells which exhibited a PCE of 9.20%. Morphological improvements and enhanced grain sizes leads to enhanced absorption of CH3NH3PbI3. Moreover solar cells have showed an excellent environmental stability of more than 100 days. This increase in efficiency is due to improved film morphology of perovskite layer after solvent treatment which has been revealed under UV–Vis spectroscopy, SEM images, X-ray diffraction and impedance spectroscopy.

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