| 초록 |
A key of improving efficiency in perovskite solar cell is controlling the crystallinity of photoactive layer. In this work, chloronaphthalene (CN) was applied to pristine anti-solvent chlorobenzene for high quality perovskite layer. For CN-treated film, large grains and smooth topography were observed by FE-SEM and AFM. Additionally, in XRD spectra, narrow FWHM of perovskite peak indicates the improved crystallinity with CN. It is attributed to high boiling point and bulky aromatic ring of CN, which lead steric hindrance. It delays the DMSO evaporation, which results in large grains based on LaMer model. The role of CN making DMSO-rich environment in adduct phase was proved by FT-IR. The enhanced performance was confirmed in terms of both solar cell and photodetector in CN-treated device. By PL and impedance, better charge carrier properties were demonstrated based on improved crystallinity. Under wide range of light intensity, LDR was increased owing to the improved current response. |
