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( Rohit ),홍창국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
The reaction temperature was kept fixed, while the reaction processing time varied from 16 to 24 h. Microscopic studies revealed these hierarchical microspheres composed of nanoparticles. The hydrothermal process time strongly influences the surface morphology of the sample deposited for 16 h by hydrothermal processes having dense microspherical morphology of agglomerated nanoparticles with 20 nm diameter. While, the sample deposited for 24 h shows well-grown microspheres with well-dispersed nanoparticles having 20 nm due to surface etching. On the basis of experimental results, a possible growth mechanism for the formation of the SnO2 hierarchical nanostructure was speculated. The dye-sensitized solar cell properties show that 1.68 and 3.12 % power conversion efficiency for the samples deposited for 16 and 24 h, respectively.
Highly Stable Ceramic Mesoporous TiO<sub>2</sub> Perovskite Solar Cells
( Rohit ),홍창국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In recent years, Tio2, a wide band gap semiconductor, has been investigated extensively due to its high surface-to-volume ratio. In organometallic halide perovskite solar cells have lot of attention due to low cost, high efficiency photovoltaic technology. There are lot of optimizing technique for high efficiency perovskite solar cell like perovskite layer morphology, composition, interfaces and charge collection efficiency. In this present work ceramic based mp-Tio2 synthesized by the sol-gel method. The ceramic based mp-Tio2 improved charge collection and charge recombination. The ceramic Tio2 improve cell efficiency and also enhances device stability.
Double Layer Mesoscopic Electron Contact for Efficient Perovskite Solar Cells
( Rohit ),홍창국 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Here, we deposit a thin layer of ZnS as a buffer layer at the interface of perovskite absorber and electron transporting layer (ETL) using atomic layer deposition (ALD) process. The impact of ZnS layer on photovoltaic characteristics of PSCs was investigated by comparison of the two mesoscopic configurations, in which the ZnS layer is grown on compact TiO2 and on mesoporous TiO2 surfaces. Our results revealed that the addition of an ultrathin ZnS layer between perovskite and ETL drastically improves the charge extraction property and reduces the interface recombination. Moreover, we demonstrate that the deposition of an optimum ZnS layer (with thickness of 1.8 nm) on top of mesoporous TiO2 surface has the best effect on the improvement of photovoltaic performance of PSCs yielding a champion efficiency of 18.80% with negligible hysteresis.
( Rohit ),( Chang Kook Hong ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The electron transporting layer (ETL) plays a vital role in the power conversion efficiency (PCE) of perovskite solar cells (PSCs). We have demonstrated the synthesis of ruthenium doped mesoporous TiO<sub>2</sub> (Ru-TiO<sub>2</sub>) and their utility as ETLs for PSCs. The doping effects of Ru+4 on the electronic and photovoltaic properties of mesoporous TiO<sub>2</sub> (mp-TiO<sub>2</sub>) have been investigated as well. The highest PCE of 18.94% was obtained with 0.1 M Ru-TiO<sub>2</sub> PSCs exhibiting an open circuit voltage (VOC) of 1.128 V, current density (JSC) of 22.55 mAcm<sup>-2</sup>, and fill factor (FF) of 76.55 %, whereas the conventional mesoporous PSCs showed PCE=16.80 %, VOC=1.095 V, JSC =21.50 mAcm<sup>-2</sup>, and FF=70.01 %. Note that the 0.1 M Ru-TiO2 device shows high PCE with negligible hysteresis index, high reproducibility, and more than 100 days stability without encapsulation as compared to conventional mesoporous PSCs.
( Rohit ),홍창국 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Now days organometallic halide perovskite solar cells have lot of attention due to low cost, high efficiency photovoltaic technology. There are lot of optimizing technique for high efficiency perovskite solar cell like perovskite layer morphology, composition, interfaces and charge collection efficiency. We demonstrate that charge collection is improved and charge recombination is reduced by formation of an engineered passivation layer. The passivation effect induced by constructing an addition layer MABr on top of the primary (FAPbI<sub>3</sub>)<sub>0.85</sub> (MAPbBr<sub>3</sub>)<sub>0.15</sub>. The MABr passivation improve cell efficiency but also enhances device stability.
Study Optical Properties of Mg-doped Zno Nanorod by Hydrothermal method for Perovskite Solar Cells
( Rohit ),( Sawanta S. Mali ),홍창국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In recent years, ZnO, a wide band gap semiconductor, has been investigated extensively due to its high surface-to-volume ratio. Intrinsic properties and potential values for application in many fields, such as gas sensors, catalyst , LED ,solar cells and so on. In the present work, we studied the effect of optical properties of Mg-doped ZnO nanorods by one step hydrothermal method for solid perovskite-sensitized solar cells. In this method, Zn(NO<sub>3</sub>)2.6H<sub>2</sub>O was used as a precursor and Mg(NO<sub>3</sub>)2.6H<sub>2</sub>O was the dopant. Different concentration of Mg-doped ZnO nanorods synthesis by hydrothermal method. Many properties of the ZnO thus can be modulated by doping of Mg. Mg doping can increase the band gap and dismiss the absorption coefficient, which is critical to the application in invisible light region. ZnO has been doped with Mg to enlarge the band gap.
( Rohit ),홍창국 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Now days organometallic halide perovskite solar cells have lot of attention due to low cost, high efficiency photovoltaic technology. There are lot of optimizing technique for high efficiency perovskite solar cell like perovskite layer morphology, composition, interfaces and charge collection efficiency. We demonstrate that charge collection is improved and charge recombination is reduced by formation of an engineered passivation layer. The passivation effect induced by constructing an addition layer MABr on top of the primary (FAPbI<sub>3</sub>)<sub>0.85</sub>(MAPbBr<sub>3</sub>)<sub>0.15</sub>. The MABr passivation improve cell efficiency but also enhances device stability.