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( Rama Krishna Chava ),강미숙 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Fabrications of core-shell heteronanostructures with excellent optical properties and light induced charge separation effects have recently emerged as promising materials for solar to hydrogen conversion. In this work, 1D-2D hierarchical core-shell heteronanostructures (CSHNSs) CdS-MoS<sub>2</sub> with Au metal nanoparticles have been synthesized by a two-step hydrothermal method. The prepared heteronanostructures exhibit high efficiency toward visible photocatalytic hydrogen production. The enhanced hydrogen evolution activity of CSHNSs was attributed to the improved visible light absorption and the formation of heterojunctions between CdS, Au and MoS<sub>2</sub> components, which increases the charge separation efficiency and thereby suppressing the electron-hole recombination.
( Rama Krishna Chava ),강미숙 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Graphitic carbon nitride (g-C<sub>3</sub>N<sub>4</sub>) with a bandgap of ~2.7 eV, a metal-free polymeric organic semiconductor, has attracted significant attention due to its excellent performance in photocatalytic H<sub>2</sub> production. The fast charge recombination, limited optical absorption and low electrical conductivity of g-C<sub>3</sub>N<sub>4</sub> impede its practical applications. Modulating the intrinsic band gap structure to broaden light response region and enhancing the separation efficiency of photogenerated electrons and holes is a promising route to significantly improve its photocatalytic performance. In this situation, indium (In) doping into g-C<sub>3</sub>N<sub>4</sub> nano-sheets has been adopted to effectively modify the intrinsic bandgap structure to prolong the light absorption and adjust the redox potentials of g-C<sub>3</sub>N<sub>4</sub> to promote the higher photocatalytic performance.
Effect of Indium doping on the charge collection efficiency of ZnO photoanodes in DSSC applications
( Rama Krishna Chava ),강미숙 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
ZnO-based Dye-sensitized solar cells technology alternative to TiO2 is considered as one of the most promising materials for solar cells. ZnO possesses energy band structure, physical properties similar to those of TiO2, and also its electron mobility is higher by 2-3 orders of magnitude. The significant drawback of ZnO based DSSCs are prominent electron loss processes which impact the electron lifetime result in poor charge collection efficiencies. In order to overcome these problems, n-/p-type doping of ZnO electrodes is an alternative to reduce the charge recombination rates. In the present work, we discuss the preparation of Indium (In) doped ZnO (IZO) nanoparticles with different amounts of Indium by using CTAB assisted method. The role of Indium addition on the photovoltaic performance of ZnO photoanodes was also systematically investigated.