http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A dense, pinholes-free pure cubic phase CsPbBr3 nanocrystals film for high-performance photodetector
Thanh-Tung Duong,Phuong-Nam Tran,Tuan-Pham Van,Duy-Hung Nguyen,Van-Dang Tran 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.2
This study demonstrates a simple centrifugal coating method to prepare high-quality pure cubic phase CsPbBr 3 nanocrystalfi lm. The resultant perovskite layers possess a uniform and dense 500 nm-thick, with a bandgap of 2.38 eV, a low trap-statedensity of 6.9 × 10 − 15 cm − 3 , and carrier mobility of approximately 19.8 cm 2 V − 1 s − 1 . Furthermore, CsPbBr 3 NCs-basedself-powered photodetectors with high charge carriers’ charge transfer are fabricated. The device shows a low dark currentdensity of 1.93 × 10 − 7 A/cm 2 at room temperature. Such photodetectors show the highest responsivity of 3.0 AW − 1 ,specifi c detectivity of 1.2 × 10 13 Jones, and external quantum effi ciency (EQE) of 920% at zero bias voltage. The proposedmethod shows signifi cant promise for use in the lab fabrication of optoelectronic devices based on thin fi lms of nanocrystalperovskite materials.
Thanh-Tung Duong,Ta Quoc Tuan,Dang Viet Anh Dung,Nguyen Van Quy,Dinh-Lam Vu,Man Hoai Nam,Nguyen Duc Chien,윤순길,Anh-Tuan Le 한국물리학회 2014 Current Applied Physics Vol.14 No.12
Polyaniline nanowires (PANI NWs) were deposited onto fluorine-doped tin oxide (FTO) glass substrate using the cyclic voltammetric method with aniline monomer precursor in HCl aqueous solution. The secondary oxidation peak plays an important role in polymerization of aniline monomer and the optimization of catalytic activity of PANI-based counter electrodes was achieved by controlling the number of cycles. The photovoltaic performance of the dye-sensitized solar cells (DSSCs) with PANI NWs counter electrodes (CEs) was optimized at 4th cycles, and then following parameters were obtained: Jsc ¼ 17.2 mA cm2, Voc ¼ 0.71 V, FF ¼ 59.3%, and efficiency (h) ¼ 7.24%. While, Jsc ¼ 14.7 mA cm2, Voc ¼ 0.77 V, FF ¼ 70.6%, and efficiency (h) ¼ 7.98% in cells with Pt CEs. The PANI NWs were attractive as an alternative CEs for the low-cost DSSCs instead of Pt.
Reduced Reference Quality Metric for Synthesized Virtual Views in 3DTV
Thanh Ha Le,Vuong Tung Long,Dinh Trieu Duong,정승원 한국전자통신연구원 2016 ETRI Journal Vol.38 No.6
Multi-view video plus depth (MVD) has been widely used owing to its effectiveness in three-dimensional data representation. Using MVD, color videos with only a limited number of real viewpoints are compressed and transmitted along with captured or estimated depth videos. Because the synthesized views are generated from decoded real views, their original reference views do not exist at either the transmitter or receiver. Therefore, it is challenging to define an efficient metric to evaluate the quality of synthesized images. We propose a novel metric—the reduced-reference quality metric. First, the effects of depth distortion on the quality of synthesized images are analyzed. We then employ the high correlation between the local depth distortions and local color characteristics of the decoded depth and color images, respectively, to achieve an efficient depth quality metric for each real view. Finally, the objective quality metric of the synthesized views is obtained by combining all the depth quality metrics obtained from the decoded real views. The experimental results show that the proposed quality metric correlates very well with full reference image and video quality metrics.
Thanh-Tung Duonga,Phan Huy Hoang,Luu Thi Nhan,Luong Van Duong,Man Hoai Nam,Le Quoc Tuan 한국물리학회 2019 Current Applied Physics Vol.19 No.11
Large-grain-size and void-free CH3NH3PbI3 films with bilayer structure are fabricated by spin-coating a PbI2 layer onto a mesoporous TiO2 layer and sequentially spraying CH3NH3I (methylammonium iodide, MAI) multilayers. The sprayer is controlled by a homemade three-axis computer numerical control machine; thus, the substrates are coated by successive parallel passes achieved by moving the nozzle. Spray deposition at the optimal spray rate and substrate temperature produces a large-grain-size and void-free methylammonium lead iodide (MAPbI3) bilayer structure. The mesoporous TiO2 layer plays an important role in electron transport by preventing the return of electrons to the perovskite layer and decreasing the contact resistance at the perovskite/ compact TiO2/fluorine tin oxide interface. When the films are incorporated into a solar cell device with a conductive carbon counter electrode, a maximum power conversion efficiency of 10.58% is realised.
Choi, Hyung-Jin,Duong, Thanh-Tung,Yoon, Soon-Gil The Electrochemical Society 2013 Journal of the Electrochemical Society Vol.160 No.3
<P>CdS:H films were coated onto ITO/SWCNT nanocomposites using facial <I>off-axis</I> sputtering at room temperature, which enhanced the photoelectrochemical activity under visible light illumination. Crystallized ITO conducting films were grown between CdS:H and SWCNTs using nano-cluster deposition (NCD) at 250°C to decrease the contact resistance. The maximum photo-hydrogen conversion efficiencies of the CdS:H (50 nm)/ITO/SWCNT composite electrodes and the CdS:H (100 nm)/ITO/SWCNT composite electrodes, both in electrolyte solutions of 1M Na<SUB>2</SUB>S, were approximately 2.7 and 10.1%, respectively, under visible light irradiation (<I>I<SUB>o</SUB></I> = 100 mW cm<SUP>−2</SUP>). Transparent conducting oxide ITO films integrated at the interface between the CdS:H and the SWCNTs played an important role in enhancing the photo electrochemical activity.</P>
TiO<sub>2</sub> coated ZnO nanorods growth using NCD process and their gas sensing properties
Eadi, Sunil Babu,Duong, Thanh-Tung,Kim, Sungjin Elsevier 2018 Superlattices and microstructures Vol.120 No.-
<P><B>Abstract</B></P> <P>In this study, we demonstrate the growth of TiO<SUB>2</SUB> coated ZnO nanorods by chemical vapor deposition process (CVD) followed by nano-cluster deposition (NCD). The ZnO nanorods are coated uniformly by TiO<SUB>2</SUB> vapors forming porous shell. The surface morphology and structural properties were investigated by using field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy and X-ray diffraction (XRD). The grown TiO<SUB>2</SUB> coated ZnO nanorods were used for the fabrication of gas sensor for the detection of H<SUB>2</SUB> gas. The sensing results clearly show the effect of TiO<SUB>2</SUB> thickness on the ZnO nanorods. The sensitivity of 43.3, 72.9, 79.9, 88.9, and 58.49% were obtained for 0, 10, 20, 20, 30 and 35 min respectively at 320 °C for 500 ppm H<SUB>2</SUB> concentration. The effect of thickness on the sensitivity was investigated.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Growth of TiO<SUB>2</SUB> coated ZnO nanoorods using Chemical Vapor deposition process followed by Nanocluster depositions. </LI> <LI> Low tempetature Hydrogen gas sensing. </LI> <LI> The sensor show superior sensing properties with varying the thickness of TiO<SUB>2</SUB> coating in ZnO nanorods. </LI> </UL> </P>
Dielectric and ferroelectric characteristics of doped BZT-BCT ceramics sintered at low temperature
Dang Anh Tuan,Le Dai Vuongb,Vo Thanh Tung,Ngo Ngoc Tuan,Nguyen Trung Duong 한양대학교 세라믹연구소 2018 Journal of Ceramic Processing Research Vol.19 No.1
The paper presents relaxor properties of lead-free nanostructured ZnO doped BZT-BCT ceramics sintered at lowtemperature. Curie-Weiss, Quadratic, Vogel-Fulcher laws were applied to study dielectric properties. The fitting experimentaldata to the mentioned laws showed the typical diffuseness characteristic of the materials as a result of the substitution of Zn2+ions into BZT-BCT substrate. Also, received ferroelectric loops were well saturated and fairly slim for all samples that assert againdiffuse ferroelectric nature in the investigated ceramics. The characterized values of remnant polarization, Pr, and coercive field,Ec, depended on ZnO nanoparticles concentration. According to that, when varying doping content in the region of 0.00-0.25%wt,Pr improved and reached a maximum value of 6.19 μC/cm2 at 0.15%wt, then decreased monotonously. Meanwhile Eccontinuously intensified in the range of 1.36-2.72 kV/cm. In other words, nanosized ZnO particles made the ceramics harder
Van Hoa Nguyen,Thi Mai Phung Bui,Thanh Phong Le,Hoang Tung Nguyen,Minh Tuyen Truong,Minh Nhut Do,Van Nha Duong 인간식물환경학회 2022 인간식물환경학회지 Vol.25 No.6
Background and objective: For countries vulnerable to climate change as Vietnam, indigenous knowledge (IK) might assist in revealing the values of local people's adaptations to environmental stresses and potentially support decision-making. Despite IK can provide the adaptive capacity of local people's activities within environmental contexts, but it is rapidly vanishing. This study aimed to describe the documentation of IK associated with climate change adaptation of farmers in the Vietnam Mekong Delta (VMD). Methods: We focused on collecting and establishing online access to IK documents through collaboration between IK holders, public sector, collecting institutions, and researchers in the five agro-ecological zones of the VMD. An online IK database for storing IK documents has been designed and implemented based on the web application schema. Results: Through interviews, we gathered IK from farming practices that are well-adapted to climate risks such as floods, droughts, and saltwater intrusions as well as traditional knowledge being used to forecast weather, flood, and saltwater intrusion. The database for storing IK documents has been successfully deployed using free and open-source software. The database currently contains more than 260 IK documents, with their location on agro-ecological zones displayed on a web-based map. Conclusion: We have captured and provided an online access to IK on climate change adaptation of the farmers in the VMD. This research is expected as an initial strategy for long-term sustainable development of the agriculture system in this region.