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Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers

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LING, JinKiong, Bhupender PAL, KwokFeng CHONG, Lukas SCHMIDT-MENDE, Juan BISQUERT, Rajan JOSE, 2019. Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers. In: Journal of the American Ceramic Society. ISSN 0002-7820. eISSN 1551-2916. Available under: doi: 10.1111/jace.16504

@article{Ling2019-05-02Photo-45856, title={Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers}, year={2019}, doi={10.1111/jace.16504}, issn={0002-7820}, journal={Journal of the American Ceramic Society}, author={Ling, JinKiong and Pal, Bhupender and Chong, KwokFeng and Schmidt-Mende, Lukas and Bisquert, Juan and Jose, Rajan} }

Jose, Rajan Chong, KwokFeng 2019-05-18T10:26:40Z Ling, JinKiong Schmidt-Mende, Lukas Pal, Bhupender 2019-05-02 Suppression of charge recombination by thin amorphous alumina layers on metal oxide semiconductors has demonstrated a vital role in electronic appliances beside its role as an insulator. This study reports effect of amorphous alumina (Al<sub>2</sub>O<sub>3</sub>) on the structural, electrical, and optical properties of stannous oxide (SnO<sub>2</sub>). The sam- ples for the present study are prepared as nanofibers by electrospinning a polymeric solution containing aluminum and stannous precursors and subsequent annealing; six samples with varying concentrations of aluminum and stannous are considered. A crystal‐amorphous SnO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> hybrid system was confirmed by both XRD and XPS analysis. Both BET and Mott‐Schottky analysis showed increase in the surface area and conduction band minimum of the sample with increase in the Al content, how- ever, at the expense of its electrical conductivity. The electron lifetime of the sample increased with increase in the Al content, but the electron transport time increase with decrease in the electrical conductivity of the sample. Both Urbach energy meas- urement and Stoke's shift showed generation of deeper trap state with increase in the Al content. Investigation on sample photovoltaic performance showed that the loss in electrical conductivity of the sample can be compensated by the improved surface area to a certain extent. Interestingly, a composite nanofiber containing equal molar fraction of aluminum and stannous showed orders of magnitude higher photocurrent despite its similar resistivity as that of pure alumina fibers, which is shown to origi- nate from a Fermi energy gradient at the Al<sub>2</sub>O<sub>3</sub>/SnO<sub>2</sub> interface. Pal, Bhupender Bisquert, Juan Bisquert, Juan Photocurrents in crystal‐amorphous hybrid stannous oxide/alumina binary nanofibers Chong, KwokFeng Jose, Rajan Schmidt-Mende, Lukas Ling, JinKiong eng 2019-05-18T10:26:40Z

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