A5078913450- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- ZnO doping and properties
- Semiconductor materials and interfaces
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Perovskite Materials and Applications
- Advanced Photocatalysis Techniques
- Supercapacitor Materials and Fabrication
- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Electrochemical Analysis and Applications
- Advancements in Battery Materials
- solar cell performance optimization
- Conducting polymers and applications
- Gas Sensing Nanomaterials and Sensors
- Advanced Battery Materials and Technologies
- Phase-change materials and chalcogenides
- Nanowire Synthesis and Applications
- Innovation in Digital Healthcare Systems
- Machine Learning in Materials Science
- Graphene and Nanomaterials Applications
- Hybrid Renewable Energy Systems
- Advanced Battery Technologies Research
Chonnam National University
2016-2025
Chonnam National University Hospital
2020-2023
Government of the Republic of Korea
2020
Convergence
2020
Gwangju University
2020
Gwangju Institute of Science and Technology
2019
The highest efficiency of 4.225% for vapor-transport-deposited SnS absorber/CdS heterojunction solar cells with good long-term stability over two years is achieved.
Transition-metal phosphide (TMP) nanostructures have been extensively studied for hydrogen evolution reaction (HER) and oxygen (OER). However, phase-controlled synthesis of colloidal Ni2P nanocrystals (NCs) or related heterostructures remains challenging their use as bifunctional electrocatalysts in overall water splitting (OWS) is not systematically studied. Herein, zero-dimensional (0D) NCs are synthesized using a robust solution-phase method encapsulated two-dimensional (2D) N- S-doped...
The coupling of oxygen evolution reaction (OER) catalysts with photoanodes is a promising strategy for enhancing the photoelectrochemical (PEC) performance by passivating photoanode's surface defect states and facilitating charge transfer at photoanode/electrolyte interface. However, serious interface recombination issue caused poor OER coating quality often limits further improvement photoanodes. Herein, rapid Fenton-like method demonstrated to produce ultrathin amorphous Ni:FeOOH in...
Abstract Kesterite is an earth‐abundant energy material with high predicted power conversion efficiency, making it a sustainable and promising option for photovoltaics. However, large open circuit voltage V oc deficit due to non‐radiative recombination at intrinsic defects remains major hurdle, limiting device performance. Incorporating Ge into the kesterite structure emerges as effective approach enhancing performance by manipulating morphology. Herein, how different amounts of affect...
Herein, we report a facile process, i.e., controlling the initial chamber pressure during postdeposition annealing, to effectively lower band tail states in synthesized CZTSSe thin films. Through detailed analysis of external quantum efficiency derivative ( dEQE/ dλ) and low-temperature photoluminescence (LTPL) data, find that are significantly influenced by annealing pressure. After carefully optimizing deposition processes device design, able synthesize kesterite films with energy...
NiCoFe-LTH nanosheet arrays on a nickel foam substrate act as an efficient and stable electrocatalyst for urea electrolysis, which needs only 1.49 V 10 mA cm −2 .
Abstract The performance of kesterite Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cell is known to be severely limited by the nonradiative recombination near heterojunction interface and within bulk CZTSSe absorber resulting from abundant centers carrier collection efficiency. Herein, simultaneously reduced incorporating small amounts Ge Cd into absorber. Incorporation effectively increases p‐type doping, thus successfully improving conductance reducing in via enhanced quasi‐Fermi level splitting,...
The Raman analysis of Cu 2 ZnSn(S,Se) 4 thin films revealed a change in the relative defect concentration and device performance with composition.
Abstract The Earth‐abundant element‐based Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber is considered as a promising material for thin‐film solar cells (TFSCs). current record power conversion efficiency (PCE) of CZTSSe TFSCs ≈13%, and it's still lower than CdTe CIGS‐based TFSCs. A further breakthrough in its PCE mainly relies on deep insights into the various device fabrication conditions; accordingly, experimental–oriented machine learning (ML) approach can be an effective way to discover key...
Replacing kinetically sluggish oxygen evolution reaction (OER) with a thermodynamically favorable hydrazine oxidation (HzOR) to produce hydrogen has emerged as more energy-efficient alternative than water splitting. However, the lack of promising bifunctional electrocatalysts hinders its scalable applications. Here, we report colloidal synthesis Mn-dopant induced hollow Ni2P nanocrystals (NCs) using heat-up approach, which act superior for both HzOR (55 mV at 10 mA/cm2) and (HER, 192 50...
Kesterite-based thin-film solar cells (TFSCs) have recently gained significant attention in the photovoltaic (PV) sector for their elemental earth abundance and low toxicity. An inclusive study from past reveals basic knowledge about grain boundary (GB) interior (GI) interface. However, compositional dependency of surface potential within GBs GIs remains unclear. The present work provides insights into bulk GB interfaces. tin (Sn) composition is sensitive to absorber morphology, therefore,...
Recently, kesterite-based absorbers and related compounds have been considered as promising eco-friendly light absorber materials for thin-film solar cells (TFSCs). However, the device performances of TFSCs are limited because formation defects poor interfacial properties. In this study, we developed a strategic approach to improve Cu2ZnSn(S,Se)4 (CZTSSe) using back-interface passivation layer further reduced through Ge doping. The application CuAlO2 (CAO) an intermediate near back interface...
The present work demonstrates that the addition of p-type CuAlO2 (CAO) as an intermediate layer between molybdenum (Mo) and absorber rear interface efficiently improves Cu2ZnSn(S,Se)4 (CZTSSe) device performance. efficacy is analyzed through sputtering CAO nanolayer at different deposition times on top Mo layer. ultrathin improved bulk quality with formation compact larger crystalline grains. Furthermore, CZTSSe optimum time (154 s) successfully reduced Mo(S,Se)2 thickness from ∼50 to ∼25...
Hierarchical heterostructures with a core of CoMn-LDH nanowires and shell Ni(OH) 2 were successfully synthesized by facile hydrothermal method followed electrodeposition.
Abstract In the quest for high‐efficiency photovoltaics, tandem solar cells combining perovskite and CZTSSe (copper zinc tin sulfide selenide) hold significant promise. This study explores integration of diphenylammonium chloride (DPACl) as an additive within a wide‐bandgap (WBG) layer to enhance performance four‐terminal (4‐T) hybrid (HTSCs) device. The DPACl has been systematically optimized utilized WBG (PSCs). Here, optimum amount effectively enhances quality films, improves charge...