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상압에서 제조한 포토캐소드의 전자방출 특성에 관한 연구
정효수,Jeong, Hyo-Soo 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.5
Photoemission is a process in which photons are converted into free electrons. Photocathodes are the typical materials for the process. They emit electrons when a light is irradiated upon. The traditional method of manufacturing photocathodes is complicated, requires specialized equipment, and is limited very small sized samples. $Cs_3Sb$ photocathode was formed on a substrate in $N_2$ atmospheric conditions. The photocathode formation was a gas phase reaction with the substrate. Vacuum devices were made to test electron emission characteristics of the formed photocathode. Visible light of wavelength 475 nm was used for the primary light source. The results showed high current density and long term stability of the photoelectron emission.
정효수,Kris Keller,Brad Culkin 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.6
Non-vacuum process technology was used to produce Cs3Sb photocathodes on substrates, and insitu panel devices were fabricated. The performance of the devices was characterized by measuring the anode current as functions of the devices’ operation times. An excitation light source with a 475-nm wavelength was used for the photocathodes. The device has a simple diode structure, providing unique characteristics such as a large gap, vertical electron beam directionality, and resistance to surface contamination from ion bombardment and poisoning by outgassing species. Accordingly, Cs3Sb photocathodes function as flat emitters, and the emission properties of the photocathode emitters depend on the vacuum level of the devices. An improved current stability has been observed after conducting an electrical conditioning process to remove possible adsorbates on the Cs3Sb flat emitters.
배효정,고영희,박준범,고항주,류상완,하준석 한국마이크로전자및패키징학회 2019 마이크로전자 및 패키징학회지 Vol.26 No.4
We report the fabrication of a CdS/CuInGaSe (CdS/CIGS) structure with carbon nanotubes and its application as a photocathode for photoelectrochemical water splitting. CIGS thin films were fabricated using co-evaporation by RF magnetron sputtering, while CdS was fabricated by chemical bath deposition. Spray coated multi-wall carbon nanotube (CNT) film on CdS/CIGS thin film was investigated as a photocathode. The CNT-coated CdS/CIGS showed superior photocurrent density and exhibited improved photostability.
Jang, Youn Jeong,Jeong, Inyoung,Lee, Jaehyuk,Lee, Jinwoo,Ko, Min Jae,Lee, Jae Sung American Chemical Society 2016 ACS NANO Vol.10 No.7
<P>Solar fuel production, mimicking natural photosynthesis of converting CO2 into useful fuels and storing solar energy as chemical energy, has received great attention in recent years. Practical large-scale fuel production needs a unique device capable of CO2 reduction using only solar energy and water as an electron source. Here we report such a system composed of a gold-decorated triple-layered ZnO@ZnTe@CdTe core-shell nanorod array photocathode and a CH3NH3PbI3 perovskite solar cell in tandem. The assembly allows effective light harvesting of higher energy photons (>2.14 eV) from the front-side photocathode and lower energy photons (>1.5 eV) from the back-side-positioned perovskite solar cell in a single-photon excitation. This system represents an example of a photocathode-photovoltaic tandem device operating under sunlight without external bias for selective CO2 conversion. It exhibited a steady solar-to-CO conversion efficiency over 0.35% and a solar-to-fuel conversion efficiency exceeding 0.43% including H-2 as a minor product.</P>
Jang, Youn Jeong,Lee, Jaehyuk,Lee, Jinwoo,Lee, Jae Sung American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.12
<P>A zinc telluride (ZnTe) film modified with MoS2 and carbon has been studied as a new photocathode for solar hydrogen production from photoelectrochemical (PEC) water splitting. The modification enhances PEC activity and stability of the photocathode. Thus, the MoS2/C/ZnTe/ZnO electrode exhibits highly improved activity of -1.48 mA cm(-2) at 0 V-RHE with a positively shifted onset potential up to 0.3 V-RHE relative to bare ZnO/ZnTe electrode (-0.19 mA cm(-2), 0.18 V-RHE) under the simulated 1 sun illumination. This represents the highest value ever reported for ZnTe-based electrodes in PEC water splitting. The carbon densely covers the surface of ZnTe to protect it against photocorrosion in aqueous electrolyte and improves charge separation. In addition, MoS2 further enhances the PEC performance as a hydrogen evolution co-catalyst.</P>
A Study on Operating Lifetime of Cs<sub>3</sub>Sb Emitters in Panel Device Applications
Jeong, Hyo Soo The Korean Institute of Electrical and Electronic 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
Non-vacuum processing technology was used to produce $Cs_3Sb$ photocathodes on substrates and fabricate in-situ panel devices. Electrical properties of these panel devices were characterized by measuring anode current and charge dose as functions of devices operation time. An excitation light source with a 475 nm wavelength was used for photocathodes. Results showed that emission properties of these photocathode emitters depended heavily on the vacuum level of these devices and that $Cs_3Sb$ flat emitters had the potential of operating for a long lifetime with stable electron emission characteristics via re-cesiation process in the panel device. These features make $Cs_3Sb$ photocathodes suitable as flat emitters in panel device applications.
A Study on Operating Lifetime of Cs3Sb Emitters in Panel Device Applications
정효수 한국전기전자재료학회 2017 Transactions on Electrical and Electronic Material Vol.18 No.3
Non-vacuum processing technology was used to produce Cs3Sb photocathodes on substrates and fabricate insitupanel devices. Electrical properties of these panel devices were characterized by measuring anode current andcharge dose as functions of devices operation time. An excitation light source with a 475 nm wavelength was usedfor photocathodes. Results showed that emission properties of these photocathode emitters depended heavily onthe vacuum level of these devices and that Cs3Sb flat emitters had the potential of operating for a long lifetime withstable electron emission characteristics via re-cesiation process in the panel device. These features make Cs3Sbphotocathodes suitable as flat emitters in panel device applications.
Photoelectrochemical Characterization of p-type InAlP on GaAs for Solar Water Splitting Application
Mostafa Afifi Hassan,강진호,Santosh S. Patil,Muhammad Ali Johar,류상완,박석인,송진동 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.2
The photoelectrochemical characteristics of p-InAlP grown on GaAs were investigated to exploit the potential of that material future as a photocathode in solar water splitting. The at band potential was measured, and electrochemical impedance spectroscopy was performed to propose an equivalent circuit model and circuit elements tted for charge transport analysis. Low photocatalytic activity was attributed to the band alignment with the water redox level. Since the valence band of InAlP is close to the water oxidation level, it causes inecient hole transport to the counter electrode and the accumulation of holes in the photocathode.
미세구조가 제어된 전해도금 Cu₂O 광양극의 광전기화학 특성
정다솔(Dasol Jeong),조우현(Woohyeon Jo),정재범(Jaebum Jeong),정현성(Hyunsung Jung) 한국표면공학회 2020 한국표면공학회지 Vol.53 No.5
Cu₂O films as a photocathode for photoelectrochemical water splitting were potentiostatically deposited on FTO glasses. The morphology and composition of the electrodeposited Cu₂O films were adjusted by the applied potentials. The potential-dependent grain size of Cu₂O films was characterized by XRD and SEM analysis. Photoelectrochemical properties of the fabricated Cu₂O photocathodes were investigated with photocurrents as a function of potentials under 1 sun condition of 100mW/cm². Photocurrents of the electrodeposited Cu₂O films were controlled with the tailored surface morphologies of Cu₂O photocathodes.
Oh, Yunjung,Yang, Wooseok,Kim, Jimin,Jeong, Sunho,Moon, Jooho American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.16
<P>Efficient sunlight-driven water-splitting devices can be achieved by using an optically and energetically well-matched pair of photoelectrodes in a tandem configuration. The key for maximizing the photoelectrochemical efficiency is the use of a highly transparent front photoelectrode with a band gap below 2.0 eV. Herein, we propose two-dimensional (2D) photonic crystal (PC) structures consisting of a CuFeO2-decorated microsphere monolayer, which serve as self-light-harvesting architectures allowing for amplified light absorption and high transparency. The photocurrent densities are evaluated for three CuFeO2 2D PC-based photoelectrodes with microspheres of different sizes. The optical analysis confirmed the presence of a photonic stop band that generates slow light and at the same time amplifies the absorption of light. The 410 nm sized CuFeO2 decorated microsphere 21) PC photocathode shows an exceptionally high visible light transmittance of 76.4% and a relatively high photocurrent of 0.2 mA cm(-2) at 0.6 V vs a reversible hydrogen electrode. The effect of the microsphere size on the carrier collection efficiency was analyzed by in situ conductive atomic force microscopy observation under illumination. Our novel synthetic method to produce self-light-harvesting nanostructures provides a promising approach for the solar energy by highly transparent photocathodes. effective use of solar energy by highly transparent photocathodes.</P>