A pristine
electron transport layer (ETL) usually delivers relatively
low device performance due to high defect density and/or poor contact.
Interface modification has been demonstrated to be one of the most
effective strategies to passivate the defects and improve the contact.
In this study, we employ ionic liquid 1-butyl-3-methylimidazolium
hexafluorophosphate (BMIMPF6) as an interface modifier
between an ETL and perovskite layer. The modified ETL shows enhanced
electron conductivity and a more suitable energy level, which facilitate
the electron transport. In addition, the modification reduces the
electron trap density, which decreases the hysteresis while simultaneously
improving the power conversion efficiency of the device from 18.03
to 19.66%.
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