Title
Compact TiO2/Anatase TiO2 Single-Crystalline Nanoparticle Electron-Transport Bilayer for Efficient Planar Perovskite Solar Cells
Author
Md. Shahiduzzaman, Hiroto Ashikawa, Mizuki Kuniyoshi, Sem Visal, Seiya Sakakibara, Tetsuya Kaneko, Tetsuhiro Katsumata, Tetsuya Taima, Satoru Iwamori, Masao Isomura, Koji Tomita
Year
2018
Journal
ACS Sustainable Chemistry & Engineering
Abstract
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 TiO2using 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.
Instrument
FP-8600
Keywords
Fluorescence, Photoluminescence, Nanostructures, Optical properties, Materials