A5007961587- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Semiconductor materials and interfaces
- Gastric Cancer Management and Outcomes
- Colorectal and Anal Carcinomas
- 2D Materials and Applications
- Salivary Gland Tumors Diagnosis and Treatment
- Lung Cancer Research Studies
- Head and Neck Anomalies
- Plasmonic and Surface Plasmon Research
- Conducting polymers and applications
- Neuroendocrine Tumor Research Advances
- Peptidase Inhibition and Analysis
- Perovskite Materials and Applications
- Thyroid Cancer Diagnosis and Treatment
- Advanced Semiconductor Detectors and Materials
- Neuroblastoma Research and Treatments
- Colorectal Cancer Surgical Treatments
Ewha Womans University
2019-2024
Korea Institute of Energy Research
2024
Imperial College London
2024
Ewha Womans University Medical Center
2024
Inje University
2014
Inje University Busan Paik Hospital
2013
Abstract Understanding the stress-induced phenomena is essential for improving long-term application of flexible solar cells to non-flat surfaces. Here, we investigated electronic band structure and carrier transport mechanism Cu 2 ZnSn(S,Se) 4 (CZTSSe) photovoltaic devices under mechanical stress. Highly efficient CZTSSe were fabricated controlling Na incorporation. The was deformed with stress as gap, valence edge, work function changed. Electrical properties bent surface probed by Kelvin...
It is well-known that the alkali doping of polycrystalline Cu2ZnSn(S,Se)4 (CZTSSe) and Cu(In,Ga)(Se,S)2 has a beneficial influence on device performance there are various hypotheses about principles improvement. This work clearly explains effect Na fill factor (FF) rather than all solar cell parameters (open-circuit voltage, FF, sometimes short circuit current) for overall When optimized, fabricated shows sufficient built-in potential selects better carrier transport path by high difference...
The addition of small amounts Ag to Cu(In,Ga)Se 2 (CIGS) absorbers improves the device performance CIGS solar cells by changing film microstructure, alkali distribution, and electrostatic conditions CIGS.
Abstract Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells have resource distribution and economic advantages. The main cause of their low efficiency is carrier loss resulting from recombination photo‐generated electron hole. To overcome this, it important to understand electron‐hole behavior characteristics. determine the separation characteristics, we measured surface potential local current in terms absorber depth. elemental variation intragrains (IGs) at grain boundaries (GBs) caused a band edge...
Two-dimensional and three-dimensional (2D–3D) mixed perovskites have shown noteworthy improvements in device performance stability, owing to their hydrophobic nature outstanding optoelectronic properties. However, the of mixed-dimensional heterostructure charge transport 2D–3D is not clearly understood. In this study, we elucidate effect heterostructures on relevance perovskite solar cells by changing composition [(BA2PbI4)x(MAPbI3)1–x, BA2PbI4 as a 2D added 3D MAPbI3, BA: butylamine, MA:...
An efficient carrier transport is essential for enhancing the performance of thin-film solar cells, in particular Cu(In,Ga)Se2 (CIGS) because their great sensitivities to not only interface but also film bulk. Conventional methods investigate outcoming carriers and properties measure current voltage either under illumination or dark conditions. However, evaluation changes along cross-section devices presents several limitations. To mitigate this shortcoming, we prepared gently etched...
Sb2(S,Se)3 is a highly available energy material with tunable bandgap by adjusting the S/Se ratio. Increasing Se ratio can enhance efficiency of solar cells, higher short-circuit current (JSC). However, accompanying decrease in open-circuit voltage (VOC) restricts further improvement. The defect passivation important, since it reduce carrier recombination, enhancing VOC. In this study, relevance ratio, concentration, and VOC was investigated. samples or without deposition Se-rich onto S-rich...
Neuroendocrine carcinoma (NEC) is a rare tumor, comprising < 1% of stomach cancers.A 55-year-old woman was referred to our hospital with biopsy-proven gastric cancer.A shallow ulcerative lesion detected in the lesser curvature lower body.It suspected be early cancer ⅡA + ⅡC type.Thus, endoscopic submucosal dissection performed.She subsequently diagnosed NEC, which aggressive and carries poor prognosis.We conducted radical resection laparoscopic-assisted distal gastrectomy.The tumor had...
Li-doping via LiF post deposition treatment has achieved an enhanced open-circuit voltage in Cu 2 ZnSn(S,Se) 4 solar cells. The Li passivates the defects resulting modification of interface band alignment and charge excitation.
To maintain the patient's quality of life, surgeons strive to preserve sphincter during rectal cancer surgery. This study evaluated oncologic safety a sphincter-saving resection with distal margin (DRM) <1 cm without radiotherapy in T3, mid- or low-rectal cancer.This retrospective enrolled 327 patients who underwent for proven T3 located <10 from anal verge and between January 1995 December 2011. The outcomes included 5-year cancer-specific survival, local recurrence, systemic recurrence...
Purpose The serum level of carcinoembryonic antigen (CEA) is a clinical prognostic factor in the follow-up evaluation patients with colon cancer. We aimed to evaluate significance rate decrease perioperative CEA cancer after curative resection. Methods A total 605 who underwent resection for between January 2000 and December 2007 were enrolled retrospectively. was calculated using following equation: ([preoperative - postoperative CEA]/[preoperative CEA] Ã100). Results In group preoperative...
This study aimed to assess the relationship between coexisting lymphocytic thyroiditis and T-N stages of papillary thyroid carcinoma (PTC) by histopathological analysis.The included 653 patients who underwent surgery for PTC at our hospital. Each case was classified as either Hashimoto's (HT), non-Hashimoto type (NHLT), or normal according histopathology parenchyma. Patient age, gender, surgical modality, location, T stage, N multifocality bilaterality were compared histopathology.The...
<title>Abstract</title> Flexible and lightweight Cu(In,Ga)Se<sub>2</sub> (CIGS) thin-film solar cells are promising for versatile applications, but there is limited understanding of stress-induced changes. In this study, the charge carrier generation trapping behavior under mechanical stress was investigated using flexible CIGS with various alkali treatments. Surface current at surface decreased by convex bending, which occurs less incorporation metals. The formation energy generating...
Recent efforts to achieve effective and sustainable power generation in urban environments have increasingly focused on flexible thin-film photovoltaics, owing their versatile applications building-integrated mobile devices. However,...
The recent efficiency boosting of Cu(In,Ga)Se 2 (CIGS) solar cells is undoubtedly triggered by heavy alkali postdeposition treatments (PDTs). However, the effects are not obvious under monolithically integrated CIGS modules where various current‐shunting sources can deteriorate device performance. Herein, It reported that KF PDT effectively suppress major shunting caused P1 and P3 laser scribing for monolithic interconnection, reducing cell‐to‐module (CTM) gap in photovoltaics. with NaF...
Copper indium gallium selenide (CIGS) solar cells, known for their high conversion efficiency, are designed with a V-shaped bandgap grading approach. This is accomplished by adjusting the Ga/(Ga + In) (GGI) ratio across absorber layer. However, several factors can contribute to lower open-circuit voltage and fill factor of CIGS including nonoptimal grading, incomplete or nonuniform layers, poor crystal quality, bulk defects within absorber, recombination at CIGS/Mo interface on back surface....
We fabricated hybrid nanostructures consisting of MoS2 monolayers and Au nanopillar (Au-NP) arrays. The surface morphology Raman spectra showed that the flakes transferred onto Au-NPs were very flat nonstrained. photoluminescence intensities MoS2/Au-NP 3- 20-fold larger than those on a thin film, respectively. finite-difference time-domain calculations significantly concentrated incident light near their surfaces, leading to broadband absorption enhancement in flakes. Compared with enabled...
In article number 1903085, Woo-Lim Jeong, Kyung-Pil Kim, Dong-Seon Lee, and co-workers analyze the effects of Na doping on polycrystalline flexible CZTSSe solar cells. When is excessive, a device shows low contact potential difference fill factor selects worse carrier transport path even though built-in becomes stronger. On other hand, optimized cell clearly showed enhancing effect doping.
Abstract Understanding the stress-induced physical phenomena is essential for improving long-term application of flexible solar cells to non-flat surfaces on buildings and in mobile utilities. Here, we investigated electronic band structure carrier transport mechanism Cu2ZnSn(S,Se) 4 (CZTSSe) photovoltaic devices under mechanical stress. We fabricated highly efficient CZTSSe a Mo metal foil substrate by controlling incorporation Na. When stress was applied material, deformed as gap, valence...