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Tachibana, Yasuhiro
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Topics
Publications (6/6 displayed)
- 2022Tantalum Oxide as an Efficient Alternative Electron Transporting Layer for Perovskite Solar Cellscitations
- 2022Photo-Induced Charge Carrier Dynamics of Metal Halide Perovskite
- 2020The Performance-Determining Role of Lewis Bases in Dye-Sensitized Solar Cells Employing Copper-Bisphenanthroline Redox Mediatorscitations
- 2018Identifying an Optimum Perovskite Solar Cell Structure by Kinetic Analysiscitations
- 2018Excitation wavelength dependent interfacial charge transfer dynamics in a CH3NH3PbI3 perovskite filmcitations
- 2017Fluorene-Thiophene Copolymer Wire on TiO2citations
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article
Tantalum Oxide as an Efficient Alternative Electron Transporting Layer for Perovskite Solar Cells
Abstract
Electron transporting layers facilitating electron extraction and suppressing hole recombination at the cathode are crucial components in any thin-film solar cell geometry, including that of metal–halide perovskite solar cells. Amorphous tantalum oxide (Ta2O5) deposited by spin coating was explored as an electron transport material for perovskite solar cells, achieving power conversion efficiency (PCE) up to ~14%. Ultraviolet photoelectron spectroscopy (UPS) measurements revealed that the extraction of photogenerated electrons is facilitated due to proper alignment of bandgap energies. Steady-state photoluminescence spectroscopy (PL) verified efficient charge transport from perovskite absorber film to thin Ta2O5 layer. Our findings suggest that tantalum oxide as an n-type semiconductor with a calculated carrier density of ~7 × 1018/cm3 in amorphous Ta2O5 films, is a potentially competitive candidate for an electron transport material in perovskite solar cells.