Dr. Venkata Seshaiah Katta Profile

Dr. Venkata Seshaiah Katta

at Indian Institute of Technology Hyderabad

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Proceedings Article | 9 October 2021 Poster + Presentation + Paper

Samarium-doped TiO2 photoanodes for the molecular devices for solar energy conversion

Venkata Seshaiah Katta, Vishnuvardhan Reddy Chappidi, Sai Santosh Kumar Raavi

Proceedings Volume 11893, 118931K (2021) https://doi.org/10.1117/12.2602675

KEYWORDS: Samarium, Solar energy, Dye sensitized solar cells, Titanium dioxide, Doping, Absorption, Ruthenium

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Photoanodes based on titanium dioxide (TiO₂) are ubiquitous in various molecular devices for solar energy conversion and storage.[1] Lanthanide doping of TiO₂ (LTO) is among the most explored materials with tremendous potential towards efficient charge transport mesoporous layer as well as improving the photocatalytic activity in both solar cell and solar fuel devices.[2, 3] In this work, presented a comprehensive investigation of improved performance of Samarium (Sm³⁺)-doped TiO₂ based dye-sensitized solar cells (DSSC) and Photo-electrochemical (PEC) devices and established the optimum Sm³⁺ doping of TiO₂ by characterizing the different Sm³⁺concentrations (0.1-0.5 mol%). Various techniques, namely, X-ray diffraction (XRD), scanning electron microscope (SEM), UV-VIS absorption spectroscopy, are employed for an all-inclusive characterization of the prepared Sm-TiO2 samples. The dielectric measurements on Sm-TiO² pellets established the best electrical conductivity exhibited by Sm (0.4%)-TiO². Synthesis protocols are followed based on earlier work.[3] The photoanodes based on prepared Sm-TiO₂ are deposited on FTO substrates and are used to fabricate DSSC and PEC devices. Commercial N719 dye-based DSSC devices are fabricated and tested. Devices with Sm(0.3%)-TiO₂ exhibited power conversion efficiency (η) ≈ 6.4%, which is almost 100% improvement on devices with undoped-TiO² that exhibited η: 3.4% as shown in Figure 1. Time-resolved PL-quenching measurements evidenced better electron-injection at dye/Sm (0.3%)-TiO₂ interface. Similarly, PEC devices presented higher current density at 1.2 V vs RHE potential for Sm (0.3%)- TiO₂. This enhancement corroborates the EIS measurements presenting lower charge transfer resistance values for devices with Sm (0.3%)-TiO₂.

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