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Development of ZnTe film with high copper doping efficiency for solar cells

Chinese Physics B 2022年第10期31卷 599-606页

作者：林新璐赵文雄吴秋晨张玉峰 hasitha mahabaduge 刘向鑫 Institute of Electrical Engineering Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Georgia College and State University MilledgevilleGA 31061USA Institute of Qilu Zhongke Electrical Advanced Electromagnetic Drive Technology Jinan 250101China

Since a hole barrier was formed in back contact due to mismatch of work function, the back contact material for CdTe cell has been a significant research direction. The ZnTe:Cu is an ideal back contact material, which reduces the valence band discontinuity and can be used as the electron back reflection layer to inhibit interface recombination. The conductivity of ZnTe:Cu film is improved by applying RF-coupled DC sputtering and post-deposition heat treatment. The doping efficiency is computed as the ratio of free hole density and copper concentration, which can be correlated with performance for CdTe-based solar cell. The higher doping efficiency means that more copper atoms substitute for Zn sites in ZnTe lattices and less mobilized copper atoms remain which can enter into the CdTe absorber layer. Copper atoms are suspected as dominant element for CdTe-based cell degradation. After optimizing the ZnTe:Cu films, a systematic study is carried out to incorporate ZnTe:Cu film into CdTe solar cell. The EQE spectrum is kept relatively stable over the long wavelength range without decreasing. It is proved that the conduction band barrier of device with ZnTe:Cu/Au contact material has an effect on the EQE response, which works as free electron barrier and reduces the recombination rate of free carrier. According to the dark J-V data or the light J-V data in the linear region, the current indicates that the intercept gives the diode reverse saturation current. The results of ideality factor indicate that the dominant recombination occurs in the space charge region. In addition, the space charge density and depletion width of solar cell can be estimated by C-V profiling.

关键词： solar cell radio frequency sputtering doping efficiency post-deposition heat treatment

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藤黄果对腌制草鱼鱼刺的软化作用

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食品科学 2024年第12期45卷 236-242页

作者：王晓芸 mahabaduge Chandika NIROSHAN JAYASOORIYA 熊善柏毋鑫汪慧婷高霞刘茹华中农业大学食品科学技术学院国家大宗淡水鱼加工技术研发分中心(武汉)湖北武汉430070

以草鱼鱼刺为研究对象,采用藤黄果腌制液对其进行腌制,研究不同温度(5、10、25、40℃)腌制过程中草鱼鱼刺硬度的变化规律,同时测定鱼刺的组成、结构以及腌制液的酸度和pH值等的变化,以探究藤黄果对草鱼鱼刺的软化作用和机理。结果表明,... 详细信息

以草鱼鱼刺为研究对象,采用藤黄果腌制液对其进行腌制,研究不同温度(5、10、25、40℃)腌制过程中草鱼鱼刺硬度的变化规律,同时测定鱼刺的组成、结构以及腌制液的酸度和pH值等的变化,以探究藤黄果对草鱼鱼刺的软化作用和机理。结果表明,随着腌制时间延长,草鱼鱼刺硬度逐渐下降。与新鲜鱼刺相比,腌制25 d时硬度下降71.51%~79.43%(P<0.05),灰分含量下降11.90%~16.65%(P<0.05),水分含量下降4.23%~13.08%(P<0.05)。微观结构由致密有序变得疏松多孔,这是由于H+与鱼刺中羟基磷灰石反应使骨钙溶出,同时腌制液中H+的消耗使其酸度降低、pH值升高,对鱼刺软化起主要作用的有机酸是苹果酸。红外光谱显示鱼刺中的胶原蛋白三螺旋结构未被破坏,但胶原蛋白酰胺A带吸收峰向高波数移动,表明鱼刺中的氢键减少,这可能与鱼刺中羟基磷灰石的流失有关。

关键词：藤黄果草鱼鱼刺软化腌制条件

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Fully Roll‑to‑Roll Processed Efficient Perovskite Solar Cells via Precise Control on the Morphology of PbI_(2):CsI Layer

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Nano-Micro Letters 2022年第5期14卷 110-121页

作者： Hengyue Li Chuantian Zuo Dechan Angmo hasitha Weerasinghe Mei Gao Junliang Yang Hunan Key Laboratory of Nanophotonics and Devices School of Physics and ElectronicsCentral South UniversityChangsha 410083People’s Republic of China Flexible Electronics Laboratory CSIRO ManufacturingClaytonVIC 3168Australia

Perovskite solar cells(PSCs)have attracted tremendous attention as a promising alternative candidate for clean energy *** attempts have been made with various deposition techniques to scale-up ***-die coating is a robust and facile deposition technique that can be applied in large-area roll-to-roll(R2R)fabrication of thin film solar cells with the advantages of high material utilization,low cost and high ***,we demonstrate the encouraging result of PSCs prepared by slot-die coating under ambient environment using a twostep sequential process whereby PbI_(2):CsI is slot-die coated first followed by a subsequent slot-die coating of organic cations containing solution.A porous PbI_(2):CsI film can promote the rapid and complete transformation into perovskite *** crystallinity and morphology of perovskite films are significantly improved by optimizing nitrogen blowing and controlling substrate temperature.A power conversion efficiency(PCE)of 18.13%is achieved,which is promising for PSCs fabricated by two-step fully slot-die-coated ***,PSCs with a 1 cm2 area yield a champion PCE of 15.10%.Moreover,a PCE of 13.00%is obtained on a flexible substrate by the roll-to-roll(R2R)coating,which is one of the highest reported cells with all layers except for metal electrode fabricated by R2R process under ambient condition.

关键词： Perovskite solar cells Slot-die coating Roll-to-roll Ambient condition Flexible

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A Comparison of Amniotic Fluid Index versus Single Deepest Vertical Pocket Measurement at Term as a Predictor of Adverse Perinatal Outcome

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Open Journal of Obstetrics and Gynecology 2022年第10期12卷 1062-1078页

作者： hasitha Gunasingha Sardha Hemapriya Sachini Mendis Department of Obstetrics Teaching Hospital Kandy Sri Lanka

Introduction: Oligohydramnios is an important sign of fetal jeopardy and amniotic fluid index (AFI) and single deepest vertical pocket (SDVP) have been used to detect it. Objective: To compare AFI vs. SDVP at term as a predictor of adverse perinatal outcomes. Methods: A prospective observational study was conducted in Teaching Hospital Kandy, Sri Lanka for eight months from July 2015 to March 2016. 448 Singleton pregnancies admitted after 37 completed weeks were included. AFI ≤ 5 cm and SDVP < 2 cm were the exposure variables, which were related to outcome variables. Results: Mean AFI was 11.35 cm (SD = 5.15) and Mean SDVP was 4.07 cm (SD = 1.88). AFI and SDVP values showed a significant positive correlation (r = 0.954;p < 0.001). A significant percentage with low AFI needed induction of labour (RR 2.14, 95% CI 1.85 - 2.49). Low AFI was also a significant risk factor for not having an uneventful birth outcome (RR 2.682, 95% CI 1.082 - 6.642). Low SDVP was a significant risk factor for induction of labour (RR 1.83, 95% CI 1.434 - 2.334), operative delivery (RR 1.714, 95% CI 1.292 - 2.280), meconium-stained liquor (RR 2.67, 95% CI 1.342 - 5.308), and Apgar < 7 (RR 17.74, 95% CI 7.96 - 40.924). SDVP had better predictability than AFI for adverse perinatal outcomes. Conclusion: AFI better predicted oligohydramnios and subsequent labour induction than SDVP. Low SDVP was a risk factor for adverse perinatal outcomes (such as induction of labour, meconium-stained liquor, operative delivery, 5-minute Apgar less < 7, admission to special care baby units or perinatal deaths). In predicting adverse perinatal events, a higher potential was noted in SDVP method than AFI method. To determine the most predictive cut-off values of SDVP and AFI for each perinatal outcome, an in-depth experimental analysis is required in future research.

关键词： Perinatal Outcomes Amniotic Fluid Predictability AFI SDVP

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Fully Roll-to-Roll Processed Efficient Perovskite Solar Cells via Precise Control on the Morphology of PbI2:CsI Layer

Fully Roll-to-Roll Processed Efficient Perovskite Solar Cell...

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第九届新型太阳能材料科学与技术学术研讨会

作者： Hengyue Li Chuantian Zuo Dechan Angmo hasitha Weerasinghe Mei Gao Junliang Yang School of Physics and Electronics Central South University Flexible Electronics Laboratory CSIRO Manufacturing

Flexible perovskite solar cells(f-PSCs) have attracted tremendous attention as a promising alternative candidate for clean energy generation due to their advantages of light weight and flexibility [1]. Slot-die coating is a robust and facile deposition technique that can be applied in large-area roll-to-roll(R2 R) fabrication of thin film solar cells with the advantages of high material utilization, low cost and high throughput [2]. Herein, we demonstrate the encouraging result of f-PSCs prepared by slot-die coating under ambient environment using a two-step sequential process whereby PbI:CsI is slot-die coated first followed by a subsequent slot-die coating of organic cations containing solution. A PCE of 13.00% was obtained on a flexible substrate by the R2 R coating, which is one of the highest reported cells with all layers except for metal electrode fabricated by R2 R process under ambient condition [3].

关键词： Perovskite solar cells slot-die coating roll-to-roll ambient condition flexible

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除草剂复配对油菜田杂草防除及油菜形态、产量和品质的影响

除草剂复配对油菜田杂草防除及油菜形态、产量和品质的影响

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作者： hasitha Kalhari Warusawitharana 浙江大学

学位级别：硕士

丙酯草醚(ZJ0273)是一种新型甘蓝型油菜田除草剂,它是一种2-嘧啶氧基苄基取代苯基胺类衍生物。本实验探讨了新型除草剂ZJ0273在四个剂量梯度(0、50、100和200mg/L)下结合四个不同剂量的盖草能(0、50、100和200mg/L),研究两种不同除草剂... 详细信息

丙酯草醚(ZJ0273)是一种新型甘蓝型油菜田除草剂,它是一种2-嘧啶氧基苄基取代苯基胺类衍生物。本实验探讨了新型除草剂ZJ0273在四个剂量梯度(0、50、100和200mg/L)下结合四个不同剂量的盖草能(0、50、100和200mg/L),研究两种不同除草剂的各复配组合对甘蓝型油菜形态、生理、产量、品质及杂草的影响,确定两除草剂最佳的复配方式,以使各项指标达到最优。取得的主要研究结果如下：1.试验各处理组合的杂草数量显著少于对照(不施用除草剂)。其中,以200mg/LZJ0273+200mg/L盖草能处理两周和六周后杂草数量减少最多;以200mg/L的ZJ0273+l00mg/L的盖草能处理两周后杂草数量减少程度次之。2.对种子萌发前用除草剂处理以及两种除草剂不同复配处理,分别在直播和育苗移栽条件下对油菜各种农艺性状进行考察,并对每一个除草剂复配组合的千粒重、单株角果数、每荚果粒数、单株产量和品质指标如含油量、蛋白质、芥酸与硫代葡萄糖甙含量等进行分析。结果表明,当复配组合为施用50mg/L ZJ0273+50mg/L盖草能、50mg/LZJ0273+100mg/L盖草能或50mg/L ZJ0273+200mg/L盖草能时千粒重达最大值;种子萌发前不用除草剂处理,萌发后施用50mg/L ZJ0273+50mg/L盖草能植株鲜重和干重达最大值。3.本研究表明,单独施用ZJ0273时100mg/L为最佳剂量,此时既能杀灭杂草且对甘蓝型油菜造成的伤害可忽略;50mg/L ZJ0273+100mg/L盖草能可作为最优复配组合,既能有效控制杂草也能提高菜籽的产量和品质。这些研究结果可作为改善油菜田除草剂应用的一种有效方法,并为未来发展潜力提供参考借鉴。

关键词：甘蓝型油菜 ZJ0273 盖草能杂草种群菜籽产量菜籽品质

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Mining Profitability of Telecommunication Customers Using K-Means Clustering

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Journal of Data Analysis and Information Processing 2015年第3期3卷 63-71页

作者： hasitha Indika Arumawadu R. M. Kapila Tharanga Rathnayaka S. K. Illangarathne School of Computer Science and Technology Wuhan University of Technology Wuhan China School of Economics Wuhan University of Technology Wuhan China Faculty of Applied Sciences Sabaragamuwa University of Sri Lanka Balangoda Sri Lanka School of Management Wuhan University of Technology Wuhan China

Data mining is the powerful technique, which can be widely used for discovering the customers’ behaviors as well as customer’s preferences. As a result, it has been widely used in top level companies for evaluating their Customer Relationship Management (CRM) system today. In this study, a new K-means clustering method proposed to evaluate the cluster customers’ profitability in telecommunication industry in Sri Lanka. Furthermore, RFM model mainly used as an input variable for K-means clustering and distortion curve used to identify optimal number of initial clusters. Based on the results, telecommunication customers’ profitability in Sri Lanka mainly categorized into three levels.

关键词： K-Means Clustering Data Mining RFM Model Customer Relationship Management

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日本茶叶市场概况

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中国茶叶 2008年第5期30卷 10-12页

作者： hasitha de Alwis 李清泽

日本是世界第5大茶叶消费国，虽然其绿茶消费量约占全国茶叶消费量的75％，但近年来对红茶及乌龙茶显示出持续旺盛的需求。日本绿茶消费主要通过国内生产供应，而红茶和乌龙茶则主要依赖于进口。日本每年的茶叶消费量达1．5亿kg，以绿... 详细信息

日本是世界第5大茶叶消费国，虽然其绿茶消费量约占全国茶叶消费量的75％，但近年来对红茶及乌龙茶显示出持续旺盛的需求。日本绿茶消费主要通过国内生产供应，而红茶和乌龙茶则主要依赖于进口。日本每年的茶叶消费量达1．5亿kg，以绿茶、红茶和乌龙茶为主；此外，还消费相当数量的速溶茶，2004年，进口速溶茶200万kg，但是到2005年底下降到150万kg，2006年底持续下降到100万kg。

关键词：茶叶日本市场概况消费量乌龙茶生产供应速溶茶绿茶

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亚太地区茶叶市场走势

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茶世界 2005年第7期 10-11页

作者： hasitha de Alwis 朱仲海斯里兰卡驻日大使馆

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大麦对新除草剂丙酯草醚敏感反应的生理作用和细胞学特性

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中国农业科学 2011年第18期44卷 3750-3758页

作者：郭翔张帆金宗来邓香芹吴灵通 Warusawitharana hasitha 周伟军浙江大学作物科学研究所

【目的】分析大麦对新型除草剂丙酯草醚的生理反应,研究该除草剂处理对大麦幼苗的生理指标及根系细胞亚显微结构、有丝分裂的影响,为明确丙酯草醚在大麦田的使用安全性和作用机理奠定理论基础。【方法】在大麦四叶期喷施不同浓度丙酯草... 详细信息

【目的】分析大麦对新型除草剂丙酯草醚的生理反应,研究该除草剂处理对大麦幼苗的生理指标及根系细胞亚显微结构、有丝分裂的影响,为明确丙酯草醚在大麦田的使用安全性和作用机理奠定理论基础。【方法】在大麦四叶期喷施不同浓度丙酯草醚,分析处理后乙酰乳酸合成酶(ALS)活性、蛋白含量、叶绿素荧光参数、叶绿素含量、光合速率的变化趋势,并研究100 mg·L-1浓度丙酯草醚对根尖细胞发育的影响。【结果】田间推荐浓度100 mg·L-1丙酯草醚在处理初期对大麦幼苗的影响较小,但随处理时间延长,该浓度处理对大麦叶片ALS活性、蛋白含量、光合系统各项参数的抑制作用加剧,并造成根尖细胞液泡体积减小、数量减少、微粒体数量增多、有丝分裂指数降低等现象。500、1 000 mg·L-1浓度处理在不同时期对大麦各项生理指标均表现出显著的抑制作用。【结论】大麦对100 mg·L-1丙酯草醚在处理后期反应较为敏感,500、1 000 mg·L-1浓度处理对苗期大麦不安全,光合系统受抑制及线粒体中微粒体的变化可能与丙酯草醚的作用机理有关。

关键词：大麦丙酯草醚乙酰乳酸合成酶蛋白含量光合系统显微结构有丝分裂指数

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