Abstract
Interfacial modification plays a vital role in boosting the performance of planar perovskite solar cells (PSCs). Here, perovskite-type BaTiO3 nanocrystals prepared by immersing dense blocking TiO2 (bl-TiO2) in Ba(NO3)2 solution were used as an interfacial modifier. The interface bonding was improved due to the fact that BaTiO3 and CH3NH3PbI3 (MAPbI3) have the same structure. Incorporation of BaTiO3 nanocrystals effectively boosted the electron extraction rate and suppressed the carrier recombination at the interface. The MAPbI3 grains nucleated and grew rapidly, resulting in larger grain size after introduction of BaTiO3 nanocrystals. Photoluminescence (PL) spectroscopy, time-resolved PL decay spectroscopy, and electrochemical impedance spectroscopy measurements verified that the BaTiO3 nanocrystals indeed promoted the carrier separation rate while suppressing nonradiative carrier recombination. By optimizing the bl-TiO2/MAPbI3 interface, the power conversion efficiency of planar PSCs based on bl-TiO2/BaTiO3 was improved from 15.03% to 17.71% [Jsc = 22.49 mA/cm2, Voc = 1.12 V, fill factor (FF) = 70%].
Published Version
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