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Effect of hydrogen annealing on characteristics of polycrystalline silicon

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Rare Metals 2006年第Z1期25卷 173-175页

作者： GOU Xianfang xu ying li xudong HENG Yang MA lifen REN Bingyan Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Institute of Information Function Materials Hebei University of Technology Tianjin 300130 China

The characteristics of mc-Si used for solar cells during H2 ambient annealing at 800-1200 ℃ were investigated by means of FTIR and QSSPCD. The results reveal that grain boundaries or defects in mc-Si may facilitate the formation of oxygen precipitates, and the formation of oxygen precipitates has deleterious effect on the lifetime of mc-Si. Decreasing lifetime could result from the formation of new recombination during annealing. Additionally, It is found that hydrogen may facilitate the formation of oxygen precipitates in mc-Si. On the other hand, the diffusion of hydrogen may passivate the defects/boundaries and it is beneficial to the lifetime of mc-Si.

关键词： multi-crystalline silicon oxygen and carbon minority carrier lifetime annealing

Study of Thermal Treatment on Properties of Polycrystalline Silicon

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Journal of Rare Earths 2006年第Z1期24卷 237-240页

作者： Ren Bingyan Gou Xianfang Ma lifen li xudong xu ying Wang Wenjing Institute of Information Function Materials Hebei University of Technology Tianjin 300130 China Institute of Information Function Materials Hebei University of Technology Tianjin 300130 China Institute of Information Function Materials Hebei University of Technology Tianjin 300130 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China

The effects of thermal annealing on oxygen behavior and carrier lifetimes of mc-Si wafers were investigated by means of FTIR and QSSPCD during single step and two step heat treatments in N2 and O2 ambient. It reveals that interstitial oxygen concentration of mc-Si and CZ-Si has a slighter decrease in N2 and O2 ambient during single-step annealing, which means oxygen precipitates are not generated. But oxygen concentration greatly decreases and generates a number of oxygen precipitates during two-step annealing. Bulk lifetime of mc-Si increases in N2 ambient at 850, 950, 1150 ℃ respectively, and annealing in O2 shows better results than that in N2 and annealing in two-step reflected better consequence than annealing in single-step. But lifetime of CZ-Si annealed in N2 or O2 decreases rapidly. The reason of lifetime increase is probably considered due to the fact that interstitial Si atoms of Si/SiO2 interface fill vacancies or some recombination centers at high temperature annealing. Moreover, a number of impurities in mc-Si probably diffuse to grain boundaries so that greatly reduce recombination centers result to lifetime rising.

关键词： polycrystalline silicon oxygen lifetime

mc-Si:H/c-Si solar cell prepared by PECVD

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Rare Metals 2006年第Z1期25卷 176-179页

作者： xu ying liAO Xianbo DIAO Hongwei li xudong ZENG Xiangbo liU Xiaoping WANG Minhua WANG Wenjing State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China

Hetero-junction solar cells with an mc-Si:H window layer were achieved. The open voltage is increased while short current is decreased with increasing the mc-Si:H layer′s thickness of emitter layer. The highest of Voc of 597 mV has obtained. When fixed the thickness of 30 nm, changing the N type from amorphous silicon layer to micro-crystalline layer, the efficiency of the hetero-junction solar cells is increased. Although the hydrogen etching before deposition enables the c-Si substrates to become rough by AFM images, it enhances the formation of epitaxial-like micro-crystalline silicon and better parameters of solar cell can be obtained by implying this process. The best result of efficiency is 13.86% with the Voc of 549.8 mV, Jsc of 32.19 mA·cm-2 and the cell′s area of 1 cm2.

关键词： solar cell hetero-junction amorphous silicon plasma enhanced CVD

Enhanced maximum energy product of(SmY)FeN caused by abundant yttrium doping

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Journal of Rare Earths 2020年第10期38卷 1060-1068,I0002页

作者： Jianwei xu jingwu Zheng Haibo chen liang Qiao Yao ying Wei Cai Wangchang li Jjing Yu Min lin Shenglei che Research Center of Magnetic and Electronic Materials College of Materials Science and Engineering.Zhejiang University of TechnologyHangzhou 310014China Hangzhou Haisheng Technology Co. LtdHangzhou 310019China Key Laboratory of Magmetic Materials and Devices.Ningbo Institute of Material Technologv&Engineering.Chinese Academy of Science Ningbo 315201China

Replacement of samarium(Sm) with abundant yttrium(Y) can help solve the potential shortage of Sm in the preparation of promising Sm2 Fe17 Nx *** this article,phase composition,microstructure and magnetic properties of(Sm1-yYy)2 Fe17Nx(y=0,0.2,0.4,0.6,0.8,1.0) were *** energy product(BH)max is improved when less than 40 at% Y is doped in(Sm1-yYy)2 Fe17Nx *** particular,when 20 at% Y replaces Sm,(BH)max of(Sm1-yYy)2 Fe17Nx powder increases by 15.1% from 131.7 to151.6 kJ/*** effect of annealing temperature on the structural properties of high Y doping(Sm0.6Y0.4)2 Fe17 and the magnetic properties of the corresponding nitrides were subsequently *** the RE2 Fe17 phase grain combination process,the interlaced structure of the rhombohedral Th2 Zn17-type structural phase and the hexagonal Th2 Ni17-type structural phase is *** to shortrange exchange coupling,the nitride with the highest content of two interlaced RE2 Fe17 phases has the highest magnetic properties:Br=1.23 T,HcJ=443.9 kA/m and(BH)max=197.6 kJ/m3.

关键词： Sm2Fe17Nx Y substitution Maximum energy product Annealing temperature Coexisting RE2Fe17 phases Rare earths

Corrosion mechanism of H_2O on Sm_2Fe_(17) and nitrogenation process of corroded Sm_2Fe_(17)

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Journal of Rare Earths 2019年第6期37卷 638-644页

作者： Jianwei xu Jingwu Zheng Haibo chen liang Qiao Yao ying Wei Cai Wangchang li Jing Yu Min lin Shenglei che Research Center of Magnetic and Electronic Materials College of Materials Science and EngineeringZhejiang University of Technology Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Material Technology & EngineeringChinese Academy of Sciences

Sm_2 Fe_(17) prepared by reduction-diffusion method needs to be washed with water to remove calcium oxide. Electrochemical corrosion occurs when Sm_2 Fe_(17) powder is in contact with liquid water. Corrosion mechanism of H_2 O on Sm_2 Fe_(17) powder and nitrogenation process of corroded Sm_2 Fe_(17) were studied by analyzing the structure and morphology. It is indicated that the metallic hydroxide forms and deposits on the Sm_2 Fe_(17) powder surfaces during water corrosion. At the same time, oxygen and hydrogen enter the unit cell of Sm2 Fe_(17), causing a slight increase in Curie temperature. In the subsequent nitriding process,the hydroxide is dehydrated and hydrogen is desorbed. The resulting oxide reacts with Sm_2 Fe_(17)N_x to form a-Fe and Sm_2 O_3. Thermodynamic calculations using the HSC chemistry 6.0 software indicate that the reaction can occur spontaneously. The effect of water corrosion on the magnetic properties of the nitride can be eliminated by hydrogen reduction prior to nitriding.

关键词： Sm2Fe17 Nitrogenation Reduction-diffusion method Water corrosion α-Fe formation Rare earths

Expression of dectin-1 during fungus infection in human corneal epithelial cells

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International Journal of Ophthalmology(English edition) 2014年第1期7卷 34-37页

作者： Cui li Gui-Qiu Zhao cheng-Ye che Na li Jing lin Qiang xu Qian Wang ying liu Sheng Qiu Department of Ophthalmology the Affiliated Hospital of Medical CollegeQingdao University

AIM: To evaluate the expression of dendritic cell-associated C-type lectin-1(dectin-1) in human corneal epithelial(HCE) cells infected by fungus. · METHODS: A total of 20 cases of healthy donor corneas were group A,and 20 patients(20 eyes) suffered from fungal keratitis(FK) composed group B. Real-time qPCR and immunohistochemistry were applied to detect dectin-1 expression in corneal epithelium of both groups. HCE cells were cultured with aspergillus fumigatus(AF) antigens in vitro. The expression of dectin-1 mRNA was measured by real-time qPCR at the stimulation of 0,4,8 and 24h separately. Dectin-1 protein was detected by immunocytochemistry at 0 and 24h separately. ·RESULTS: Dectin-1 expressed in corneal epithelium of normal persons and FK patients. Vitro cellular experiment showed that the expression of dectin-1 mRNA in HCE cells began to increase after stimulation of AF antigens at 4h,and dectin-1 protein expression increased after stimulation at 24h. · CONCLUSION: Dectin-1 expressed in corneal epithelium of normal persons. AF antigens stimulation can elevate the expression of dectin-1 in HCE cells in vitro.

关键词： dectin-1 corneal epithelial cells fungal keratitis human

Effects of mild/asymptomatic COVID-19 on semen parameters and sex-related hormone levels in men:a systematic review and meta-analysis

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Asian Journal of Andrology 2023年第3期25卷 382-388页

作者： Bang-Wei che Pan chen ying Yu Wei li Tao Huang Wen-Jun Zhang Sheng-Han xu Jun He Miao liu Kai-Fa Tang Department of Urology The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550004China

Coronavirus disease 2019(COVID-19)has yet to be proven to alter male reproductive function,particularly in the majority of mild/asymptomatic *** purpose of this study was to explore whether mild/asymptomatic COVID-19 affects semen quality and sex-related hormone *** find suitable comparative studies,a systematic review and meta-analysis was done up to January 22,2022,by using multiple databases(Web of Science,PubMed,and Embase).Preferred Reporting Items for Systematic Reviews and Meta-Analyses(PRISMA)guidelines were used to identify and choose the ***-analysis was used to examine the semen parameters and sex-related hormones of mild/asymptomatic COVID-19 patients before and after *** effects of semen collection time,fever,and intensity of verification on semen following infection were also investigated.A total of 13 studies(n=770)were included in the analysis,including three case-control studies,six pre-post studies,and four single-arm studies.A meta-analysis of five pre-post studies showed that after infection with COVID-19,sperm concentration(I^(2)=0;P=0.003),total sperm count(I^(2)=46.3%;P=0.043),progressive motility(I^(2)=50.0%;Plity(I^(2)=76.1%;P=0.047),and normal sperm morphology(I^(2)=0;P=0.001)***,a systematic review of 13 studies found a significant relationship between semen collection time after infection,inflammation severity,and semen parameter values,with fever having only bearing on semen ***,there was no significant difference in sex-related hormone levels before and after infection in mild/asymptomatic ***/asymptomatic COVID-19 infection had a significant effect on semen quality in the short *** is recommended to avoid initiating a pregnancy during this period of time.

关键词： coronavirus disease 2019 male infertility meta-analysis semen quality severe acute respiratory syndrome coronavirus 2

Genetic variability of CYP2B6 polymorphisms in four southern Chinese populations

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World Journal of Gastroenterology 2007年第14期13卷 2100-2103页

作者： Bing-ying xu li-Ping Guo Shui-Shan Lee Qing-Ming Dong Yi Tan Hong Yao li-Hua li che-Kit lin Hsiang-Fu Kung Ming-liang He Kunming Medical College Kunming 650032 Yunnan Province China Stanley Ho Center for Emerging Infectious Diseases and Li Ka Shing Institute of Health Sciences The Chinese University ofHong Kong Hong Kong China Department of Microbiology Faculty of Medicine The Chinese University of Hong Kong Hong Kong China Hong Kong Red Cross Blood Transfusion Service Hong Kong China

AIM： To investigate the genotype and allelic frequencies of Cytochrome P450 2B6 polymorphisms in four southern Chinese populations.METHODS： DNA was obtained from blood samples from Han Chinese from Hong Kong and three minority groups,the Wa, Bulang and Lahu from Yunnan in southern China. Genotyping was performed using real-time PCR and confirmed by direct sequencing.RESULTS： A total of 507 subjects from southern China were studied. Results showed there is a high prevalence of 516G 〉 T （34.5%） in ethnic Chinese compared to literature reports on other Asian populations and Caucasians. The frequency of the 516TT genotype is higher in the Hah majority （23.1%） than in three other ethnic minority groups （i.e., 7.4%, 9.1% and 15.8%） in southern China.CONCLUSION： This was the first study to document the spectrum of CYP2B6 allelic variants and genotypes in a southern Chinese population. The 516G 〉 T allele is associated with a defective metabolism of efavirenz （EFV）, which therefore may predispose to drug *** regimens for human immunodeficiency virus （HIV） and heroin addiction may need to be optimized in different populations because of the marked variability of the key metabolizing enzyme.

关键词： Polymorphism Allele Genotype Ethnicity Discrimination PCR

pH-controlled reversible sol-gel inversion by cerous phosphate nanofibers for hemostasis

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Rare Metals 2024年第10期43卷 5141-5151页

作者： Tuo Su Jun-chen xu Wei Yu Dan Su Di-Er Shi Yi-Chao Pang Yao ying Wang-Chang li Juan li Jing-Wu Zheng liang Qiao Sheng-Lei che Jing Yu Research Center of Magnetic and Electronic Materials College of Materials Science and EngineeringZhejiang University of TechnologyHangzhou 310014China State Key Laboratory for Diagnosis and Treatment of Infectious Diseases Collaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310000China Key Laboratory of Drug Safety Evaluation and Research of Zhejiang Province Department of Clinical MedicineHangzhou Medical CollegeHangzhou 310053China Department of chemistry Zhejiang UniversityHangzhou 310027China Clinical Medical College Yangzhou UniversityYangzhou 225001China

Developing biomimetic soft materials that display stimuli responsiveness using solely inorganic materials has been regarded as a challenge owing to that such materials?properties typically vary from those of living ***,biomimetic soft materials have been developed using organic materials or inorganic materials modified with organic small *** this study,we prepared cerium phosphate nanofibers(CePO_(4)NFs)by using inorganic agents only without further *** CePO_(4)NFs demonstrate sol-ge switching properties in response to pH value,allowing them to form a gel under high hydroxide ion(OH^(-))concentrations and turn back into sol under low OH^(-)*** formation of gel could be ascribed to the physical cross-linking of the nanofibers induced by the attractive electrostatic force of OH^(-)and surface Ce^(3+).As a result,CePO_(4)NFs are able to form a gel when in contac with blood of high pH value for *** specific clotting mechanism makes them better candidates for hemostasis of heavy bleeding.

关键词： Cerium phosphate nanofibers pH-responsive Reversible Sol-gel switching Hemostasis