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AgNWs networks for high-performing transparent heaters by using NiO window layer
Patel, Malkeshkumar,Chauhan, Khushbu R.,Kim, Joondong,Kim, Jong-Woong,Lim, Donggun Elsevier 2017 Sensors and actuators. A, Physical Vol.267 No.-
<P><B>Abstract</B></P> <P>We demonstrate the high-performing silver nanowire (AgNW) networks for transparent heaters by using a NiO window layer. The colorless polyimide (cPI) was used as a substrate in order to configure the transparent heater of NiO/AgNWs/cPI, having over 77% transmittance at a wavelength of 550nm. AgNWs networks were formed on the cPI substrate and the NiO layer was reactively sputtered onto AgNWs at a room temperature. Due to the NiO capping layer onto AgNWs, the electrical and optical properties of AgNW networks were preserved. An extremely high-performing AgNWs-based transparent heater was achieved by utilizing NiO protective. The NiO window layer provides an excellent atmospheric isolation for partially-embedded silver nanowires and makes the heater operation to be stable at high temperatures of 185.5°C with a relatively small bias of 7V. The excellent performances are attributed to the Schottky barrier formed between the NiO window and AgNW networks. The efficient exploitation of capping layers, such as NiO in this study will boost the viability of AgNW-based heaters and electronic devices for commercial applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High-performing transparent heater was formed by AgNWs and NiO layer. </LI> <LI> NiO layer efficiently protected AgNWs from deformation. </LI> <LI> NiO functional window effectively controlled the electrical and thermal properties. </LI> <LI> 200°C was reached by applying 7V for stable operation. </LI> </UL> </P>
Patel, Malkeshkumar,Kim, Joondong Elsevier 2017 Journal of alloys and compounds Vol.729 No.-
<P><B>Abstract</B></P> <P>All transparent photoelectric devices were achieved for the highly-performing photodetectors. The high transparent heterojunction photodetector of the configuration of NiO/ZnO/ITO/PET was realized by using the solid-state sputtering method. All metal oxide layers were formed at room temperature to be applied on the plastic substrate. The ITO layer was directly coated on the PET substrate to work as a transparent conductor. To form the transparent p/n junction, p-type NiO was reactively sputtered following by n-type ZnO deposition onto the ITO. This high visible-range transparent (74.8%) photodetector is extremely sensitive to detect the tiny UV light density of 10 μW/cm<SUP>2</SUP> with the ultra-fast photoresponse time (19 μs) and high-photoresponse ratio (1944) due to the merit of excitonic absorption. The design scheme of zero-bias operating transparent heterojunction can be applied for visible electronic devices and solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High transparent (74.8%) and ultra-performing photodetector was achieved. </LI> <LI> All metal oxides were deposited on a plastic substrate at room temperature. </LI> <LI> Heterojunction photodetector is configuring of p-type NiO and n-type ZnO. </LI> <LI> Record-fast photoresponse 19 μs was achieved by self-operating mode. </LI> </UL> </P>
Patel, Malkeshkumar,Park, Wang-Hee,Ray, Abhijit,Kim, Joondong,Lee, Jung-Ho North-Holland 2017 Solar Energy Materials and Solar Cells Vol. No.
<P><B>Abstract</B></P> <P>Earth-abundant, non-toxic, and stable porous Co<SUB>3</SUB>O<SUB>4</SUB> film grown by Kirkendall-diffusion is developed for efficient photoelectrocatalytic seawater splitting. Semitransparent Co<SUB>3</SUB>O<SUB>4</SUB> films are found highly active hydrogen evolution reaction (HER) photocatalyst with stable performances. Dual band gap (1.5eV and 2.3eV) p-type Co<SUB>3</SUB>O<SUB>4</SUB> samples exhibiting photo induced HER current density of 25mA/cm<SUP>2</SUP> is obtained with overpotential of 0.83V in the sea-water. Our Co<SUB>3</SUB>O<SUB>4</SUB> sample possesses Tafel slope of 20mV/dec, incident photon to the current conversion efficiency of > 8%, and charge transfer resistance of 3.4Ω/cm<SUP>2</SUP>. Photo induced Mott-Schottky analysis was applied to find the flat band potential corresponding to the lower band gap value and exhibited strong influence on the majority carrier concentrations and shifting of flat band potential. Electrical properties of Co<SUB>3</SUB>O<SUB>4</SUB> material and losses associated in seawater splitting were carefully studied using the Mott-Schottky and electrochemical impedance spectroscopy. Present studies on seawater splitting using Co<SUB>3</SUB>O<SUB>4</SUB> not only suggest photoelectrocatalytic hydrogen generation but also usefulness for efficient sea salts formation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Semitransparent Co<SUB>3</SUB>O<SUB>4</SUB> film is grown by the Kirkendall-diffusion. </LI> <LI> Co<SUB>3</SUB>O<SUB>4</SUB> is capable to photoinduced seawater splitting for hydrogen generation. </LI> <LI> Porous Co<SUB>3</SUB>O<SUB>4</SUB> film to enable IPCE more than 8% at over potential of 0.83V. </LI> <LI> Dual energy gaps of Co<SUB>3</SUB>O<SUB>4</SUB> are determined using Mott-Schottky analysis. </LI> <LI> Stable photoelectrolysis seawater splitting (J = 25mA/cm<SUP>2</SUP>, η = 0.8V) is exhibited. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>