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Tran, Man Hieu,Cho, Jae Yu,Sinha, Soumyadeep,Gang, Myeng Gil,Heo, Jaeyeong Elsevier 2018 THIN SOLID FILMS - Vol.661 No.-
<P><B>Abstract</B></P> <P>The electrodeposited Cu<SUB>2</SUB>O thin films, with a controlled morphology, were obtained by varying the deposition parameters, such as the solution temperature, applied current and charge. An optimal deposition condition was achieved for a better quality Cu<SUB>2</SUB>O film which was favorable as an absorber layer for thin-film solar cell application. The effect of applied negative charge on the as-deposited Cu<SUB>2</SUB>O films was investigated, resulting in an increase in film thickness with increasing applied charge. The performance of the Cu<SUB>2</SUB>O/ZnO heterojunction solar cells with different Cu<SUB>2</SUB>O absorber thickness exhibited the highest power-conversion efficiency of 0.52%. Thicker Cu<SUB>2</SUB>O was beneficial for the decreased shunt conductance, but it also led to the increased series resistance. The optimal thickness of Cu<SUB>2</SUB>O absorber was ~3.3 μm.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrodeposited Cu<SUB>2</SUB>O absorber layer with controlled morphology is achieved. </LI> <LI> An optimized deposition temperature exhibits highly uniform film deposition. </LI> <LI> ALD-ZnO films are used to from the Cu<SUB>2</SUB>O/ZnO TFSCs. </LI> <LI> Performance of TFSCs is highly dependent on the thickness of Cu<SUB>2</SUB>O absorber. </LI> <LI> A maximum PCE of 0.52% is achieved with optimal Cu<SUB>2</SUB>O thickness of 3.3 μm. </LI> </UL> </P>
Tran Minh Ngoc,Tran Minh Man,Mai Thanh Phong,Mai Thanh Phong,Nguyen Huu Hieu 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.4
Silica nanoparticles were prepared from rice husk ash (RHA-silica) by precipitation method. The characterization of RHA-silica was studied by X-ray fluorescence, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy, and Brunauer-Emmett-Teller specific surface area. Results showed that RHA-silica was successfully synthesized with a particle size of 5-15 nm and purity of 98.08%. The obtained RHA-silica was applied with different content for fabrication of tubular ceramic-supported poly(vinyl alcohol) membranes using malic acid as a cross-linking agent (RHA-silica/MA-PVA) by dip-coating and solvent evaporation methods. The tubular ceramic-supported RHA-silica/MA-PVA membranes were used for dehydration of 95 wt% ethanol solution by pervaporation (PV) technology. Results indicated membrane with 15 wt% RHA-silica (15RHA-silica/MA-PVA) was suitable for the dehydration with permeate flux of 0.0856 kg/m2·h, separation factor of 46.6, and pervaporation separation index of 3.9 kg/m2h. The tubular ceramic-supported 15RHA-silica/MA-PVA membrane was characterized using XRD, FTIR, scanning electron microscope, differential scanning calorimetry, and contact angle measurement. Results showed that this membrane was 30 m thick, mechanical stable (swelling rate, 133.9%), hydrophobic (contact angle, 81o), and thermal stable (glass transition temperature, 138.7 oC). Therefore, the tubular ceramic-supported nanocomposite membrane could be considered as a potential alternative for PV dehydration of ethanol.
이원계 칼코지나이드 소재 기반 박막 태양전지 연구 동향
임동하,이다정,조재유,신경록,Man Hieu Tran,Soumyadeep Sinha,허재영 한국태양광발전학회 2017 한국태양광발전학회지 Vol.3 No.3
최근 들어 환경오염 문제와 화석에너지 자원 고갈로 인해 친환경적인 청정에너지 개발에 대한 중요성이 지속적으로 증대되고 있다. 태양광 기술은 다양한 장점에도 불구하고 아직까지 보급 확대 수준이 미미한데, 이는 기존 화석연료 기반 발전방식에 비해 발전단가의 경제성이 확보되지 않았기 때문이다. 본 원고에서는 이러한 발전단가를 낮추기 위해 이루어지고 있는 연구의 일례로서 SnS와 Sb₂Se₃ 중심의 이원계 칼코지나이드(binary chalcogenides) 원소 기반 박막태양전지 연구 동향을 알아보고자 한다.
ALD ZnO 버퍼층 증착 온도가 전착 Cu₂O 박막 태양전지 소자 특성에 미치는 영향
조재유(Jae Yu Cho),트란 휴만(Man Hieu Tran),허재영(Jaeyeong Heo) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.1
Beside several advantages, the PV power generation as a clean energy source, is still below the supply level due to high power generation cost. Therefore, the interest in fabricating low-cost thin film solar cells is increasing continuously. Cu₂O, a low cost photovoltaic material, has a wide direct band gap of ~2.1 eV has along with the high theoretical energy conversion efficiency of about 20%. On the other hand, it has other benefits such as earth-abundance, low cost, non-toxic, high carrier mobility (100 cm²/Vs). In spite of these various advantages, the efficiency of Cu₂O based solar cells is still significantly lower than the theoretical limit as reported in several literatures. One of the reasons behind the low efficiency of Cu₂O solar cells can be the formation of CuO layer due to atmospheric surface oxidation of Cu₂O absorber layer. In this work, atomic layer deposition method was used to remove the CuO layer that formed on Cu₂O surface. First, Cu₂O absorber layer was deposited by electrodeposition. On top of it buffer (ZnO) and TCO (AZO) layers were deposited by atomic layer deposition and rf-magnetron sputtering respectively. We fabricated the cells with a change in the deposition temperature of buffer layer ranging between 80°C to 140°C. Finally, we compared the performance of fabricated solar cells, and studied the influence of buffer layer deposition temperature on Cu₂O based solar cells by J-V and XPS measurements.
ALD ZnO 버퍼층 증착 온도가 전착 Cu<sub>2</sub>O 박막 태양전지 소자 특성에 미치는 영향
조재유,트란 휴 만,허재영,Cho, Jae Yu,Tran, Man Hieu,Heo, Jaeyeong 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.1
Beside several advantages, the PV power generation as a clean energy source, is still below the supply level due to high power generation cost. Therefore, the interest in fabricating low-cost thin film solar cells is increasing continuously. $Cu_2O$, a low cost photovoltaic material, has a wide direct band gap of ~2.1 eV has along with the high theoretical energy conversion efficiency of about 20%. On the other hand, it has other benefits such as earth-abundance, low cost, non-toxic, high carrier mobility ($100cm^2/Vs$). In spite of these various advantages, the efficiency of $Cu_2O$ based solar cells is still significantly lower than the theoretical limit as reported in several literatures. One of the reasons behind the low efficiency of $Cu_2O$ solar cells can be the formation of CuO layer due to atmospheric surface oxidation of $Cu_2O$ absorber layer. In this work, atomic layer deposition method was used to remove the CuO layer that formed on $Cu_2O$ surface. First, $Cu_2O$ absorber layer was deposited by electrodeposition. On top of it buffer (ZnO) and TCO (AZO) layers were deposited by atomic layer deposition and rf-magnetron sputtering respectively. We fabricated the cells with a change in the deposition temperature of buffer layer ranging between $80^{\circ}C$ to $140^{\circ}C$. Finally, we compared the performance of fabricated solar cells, and studied the influence of buffer layer deposition temperature on $Cu_2O$ based solar cells by J-V and XPS measurements.