Electron-transport
layer (ETL)/perovskite interface modification
plays a key task for producing efficient planar perovskite solar cells
(PSCs). In this study, interfacial modification of compact TiO2 using novel, one-step hydrothermally synthesized single-crystalline
anatase (AT) titania nanoparticles (TiO2 NPs) (average
diameter = 6–10 nm) was applied as an ETL bilayer to enhance
the efficient charge generation and extraction and eliminate the electron–hole
recombination ratio. We report here an easy approach for enhancing
the performance of planar PSCs by introducing a compact TiO2/AT TiO2 NPs bilayer through spray pyrolysis (SP) deposition
and spin-coating (SC) techniques, respectively. The enhanced performance
of the devices with an SP-TiO2/SC-AT TiO2 NPs
bilayer facilitated more efficient electron transport, charge extraction,
and low interfacial recombination. Ultimately, the best device had
a 17.05% power conversion efficiency resulting from the significant
decrease in J–V hysteresis, presenting almost
a 12% performance improvement compared to the TiO2 only
layer-based counterpart. Thus, the present study provides an important
advance to the design of photovoltaic devices with respect to charge
transport and electron–hole recombination.
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