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Data-driven design of high-performance MASnxPb1-xI3 perovskite materials by machine learning and experimental realization

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Light(Science & Applications) 2022年第9期11卷 2115-2126页

作者： XIA CAI FENGCAI LIU anran yu JIAJUN QIN MOHAMMAD HATAMVAND IRFAN AHMED JIAYAN LUO YIMING ZHANG HAO ZHANG YIQIANG ZHAN School of Information Science and Technology Fudan UniversityShanghai 200433China College of Information Mechanical and Electrical EngineeringShanghai Normal UniversityShanghai 200234China Center of Micro-Nano System Fudan UniversityShanghai 200433China Department of Physics Chemistry and BiologyLinkoping UniversityLinkoping SE-58183Sweden Key Laboratory of Micro and Nano Photonic Structures and Department of Optical Science and Engineering Fudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Chengbei RoadYiwu CityZhejiang 322000China

The photovoltaic performance of perovskite solar cell is determined by multiple interrelated factors,such as perovskite compositions,electronic properties of each transport layer and fabrication parameters,which makes it rather challenging for optimization of device performances and discovery of underlying ***,we propose and realize a novel machine learning approach based on forward-reverse framework to establish the relationship between key parameters and photovoltaic performance in high-profile MASnxPb1-xI3 perovskite *** proposed method establishes the asymmetrically bowing relationship between band gap and Sn composition,which is precisely verified by our *** on the analysis of structural evolution and SHAP library,the rapid-change region and low-bandgap plateau region for small and large Sn composition are explained,*** establishing the models for photovoltaic parameters of working photovoltaic devices,the deviation of short-circuit current and open-circuit voltage with band gap in defective-zone and low-bandgap-plateau regions from Shockley-Queisser theory is captured by our models,and the former is due to the deep-level traps formed by crystallographic distortion and the latter is due to the enhanced susceptibility by increased Sn4+*** more difficulty for hole extraction than electron is also concluded in the models and the prediction curve of power conversion efficiency is in a good agreement with Shockley-Queisser *** the help of search and optimization algorithms,an optimized Sn:Pb composition ratio near 0.6 is finally obtained for high-performance perovskite solar cells,then verified by our *** constructive method could also be applicable to other material optimization and efficient device development.

关键词： perovskite performance optimization

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Hole Injection Enhancement of MoO3/NPB/Al Composite Anode

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Chinese Physics Letters 2019年第12期36卷 57-61页

作者： Yanjing Tang Xianxi yu Shaobo Liu anran yu Jiajun Qin Ruichen Yi yuan Pei Chunqin Zhu Xiaoyuan Hou State Key Laboratory of Surface Physics Key Laboratory of Micro and Nano Photonic Structures(Ministry of Education)and Collaborative Innovation Center of Advanced MicrostructuresFudan UniversityShanghai 200433

An ultra-thin molybdenum(VI)oxide(MoO3)modification layer can significantly improve hole injection from an electrode even though the MoO3 layer does not contact the *** find that as the thickness of the organic layer between MoO3 and the electrode increases,the hole injection first increases and it then *** optimum thickness of 5 nm corresponds to the best current improvement 70%,higher than that in the device where MoO3 directly contacts the Al *** to the 4,4-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl(NPB)/MoO3 interface charge transfer mechanism and the present experimental results,we propose a mechanism that mobile carriers generated at the interface and accumulated inside the device change the distribution of electric field inside the device,resulting in an increase of the probability of hole tunneling through the injection barrier from the electrode,which also explains the phenomenon of hole injection enhanced by MoO3/NPB/Al composite *** on this mechanism,different organic materials other than NPB were applied to form the composite electrode with *** current enhancement effects are also observed.

关键词： electrode injection mechanism

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Highly efficient flexible perovskite solar cells with vacuum-assisted low-temperature annealed SnO2 electron transport layer

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Journal of Energy Chemistry 2022年第4期31卷 1-7页

作者： Xiaoguo Li Zejiao Shi Fatemeh Behrouznejad Mohammad Hatamvand Xin Zhang Yaxin Wang Fengcai Liu Haoliang Wang Kai Liu Hongliang Dong Farhan Mudasar Jiao Wang anran yu Yiqiang Zhan Center for Micro Nano Systems School of Information Science and Technology(SIST)Fudan UniversityShanghai 200433China Academy for Engineering&Technology Fudan UniversityShanghai 200433China Center for High Pressure Science and Technology Advanced Research PudongShanghai 201203China

The demand for lightweight, flexible, and high-performance portable power sources urgently requires high-efficiency and stable flexible solar cells. In the case of perovskite solar cells(PSCs), most of the common electron transport layer(ETL) needs to be annealed for improving the optoelectronic properties,while conventional flexible substrates could barely stand the high temperature. Herein, a vacuumassisted annealing SnO_(2) ETL at low temperature(100℃) is utilized in flexible PSCs and achieved high efficiency of 20.14%. Meanwhile, the open-circuit voltage(V_(oc)) increases from 1.07 V to 1.14 V. The flexible PSCs also show robust bending stability with 86.8% of the initial efficiency is retained after 1000 bending cycles at a bending radius of 5 mm. X-ray photoelectron spectroscopy(XPS), atomic force microscopy(AFM), and contact angle measurements show that the density of oxygen vacancies, the surface roughness of the SnO_(2) layer, and film hydrophobicity are significantly increased, respectively. These improvements could be due to the oxygen-deficient environment in a vacuum chamber, and the rapid evaporation of solvents. The proposed vacuum-assisted low-temperature annealing method not only improves the efficiency of flexible PSCs but is also compatible and promising in the large-scale commercialization of flexible PSCs.

关键词： Flexible perovskite solar cells Vacuum-assisted Electron transport layer Trap-assisted recombination

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Aromatization over nanosized Ga-containing ZSM-5 zeolites prepared by different methods:Effect of acidity of active Ga species on the catalytic performance

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Journal of Energy Chemistry 2017年第4期26卷 768-775页

作者： yujun Fang Xiaofang Su Xuefeng Bai Wei Wu Gaoliang Wang Linfei Xiao anran yu National Center for International Research on Catalytic technology Key Laboratory of Chemical Engineering Process&Technology for High-efficiency ConversionCollege of Heilongjiang ProvinceSchool of Chemistry and Material SciencesHeilongjiang UniversityHarbin 150080HeilongjiangChina

Nanosized Ga-containing ZSM-5 zeolites were prepared via isomorphous substitution and impregnation followed by characterized using various techniques. The catalytic performance of the zeolites for the aromatization of 1-hexene was investigated. The results indicate that isomorphous substitution promotes the incorporation of Ga heteroatoms into the framework along with the formation of extra-framework GaO;species（[GaO;]a） that have stronger interactions with the negative potential of the framework. In addition, based on the Py-IR results and catalytic performance, the [GaO;]aspecies with stronger Lewis acid sites produced a better synergism with moderate Br?nsted acid sites and thus improved the selectivity to aromatic compounds. However, the impregnation results in the formation of Ga;O;phase and small amounts of GaO;species that are mainly located on the external surface（[GaO;];）, which contribute to weaker Lewis acid sites due to weaker interactions with the zeolite framework. During 1-hexene aromatization, the nanosized Ga isomorphously substituted ZSM-5 zeolite samples（Gax-NZ5） exhibited better catalytic performance compared to the impregnated samples, and the highest aromatic yield（i.e.,65.4 wt%） was achieved over the Ga4.2-NZ5 sample, which contained with the highest Ga content.

关键词： Nanosized ZSM-5 zeolite Isomorphous substitution Impregnation Active gallium species Aromatization

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Stabilizing α-phase FAPbI3 solar cells

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Journal of Semiconductors 2022年第4期43卷 7-9页

作者： Yaxin Wang Xin Zhang Zejiao Shi Lixiu Zhang anran yu Yiqiang Zhan Liming Ding Center for Micro-Nano Systems School of Information Science and TechnologyFudan UniversityShanghai 200433China Academy for Engineering&Technology Fudan UniversityShanghai 200433China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

Organic–inorganic hybrid perovskite solar cells(PSCs)have been recognized as a promising and cost-effective photovoltaic technology with the power conversion efficiency(PCE) exceeding 25%[1–3]. The high efficiency is attributed to the exceptional optoelectronic properties, such as high absorption coefficient, long carrier diffusion length, low non-radiative recombination rate, and so on[4–7].

关键词： exceeding exceptional perovskite

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基于短视频平台的泉州海丝文化传播

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黎明职业大学学报 2020年第2期 23-27页

作者：余安然黎明职业大学文化传播学院福建泉州362000

“移动短视频+旅游”的火热,让有关城市形象、城市文化的“爆款”视频应运而生。泉州海丝文化亦可通过短视频建立“线上形象”,提高传播成效。针对当前泉州海丝文化短视频传播的不足,需要制定策略,即:多元呈现海丝文化;发掘和扶持优秀... 详细信息

“移动短视频+旅游”的火热,让有关城市形象、城市文化的“爆款”视频应运而生。泉州海丝文化亦可通过短视频建立“线上形象”,提高传播成效。针对当前泉州海丝文化短视频传播的不足,需要制定策略,即:多元呈现海丝文化;发掘和扶持优秀传媒机构,讲好海丝故事,提高审美体验;拓展国际传播力,增强海丝文化的国际影响力。

关键词：海丝文化文化传播短视频 “抖音”

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乳液法制备聚乙烯醇-石墨烯气凝胶及其对纯有机物的吸附

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化工学报 2019年第3期70卷 1152-1162页

作者：王振有刘会娥朱佳梦陈爽于安然中国石油大学(华东)重质油国家重点实验室山东青岛266580

采用氧化石墨烯(GO)稳定的Pickering乳液为软模板,制备聚乙烯醇-石墨烯气凝胶。探究GO浓度、均质转速、油水比、乙二胺(EDA)和聚乙烯醇(PVA)用量等因素对乳液稳定性、粒径分布及气凝胶成型的影响,发现改变乳液配比可控制乳液粒径的大小... 详细信息

采用氧化石墨烯(GO)稳定的Pickering乳液为软模板,制备聚乙烯醇-石墨烯气凝胶。探究GO浓度、均质转速、油水比、乙二胺(EDA)和聚乙烯醇(PVA)用量等因素对乳液稳定性、粒径分布及气凝胶成型的影响,发现改变乳液配比可控制乳液粒径的大小,进而对气凝胶的密度和孔隙率进行调控。通过SEM、FT-IR、Raman、XRD对最优制备条件下制得的聚乙烯醇-石墨烯气凝胶(PGA)进行表征,可知GO经水热反应后被还原组装形成三维网络气凝胶结构(PGA)且其孔道直径与乳液粒径基本一致。对PGA进行挤压实验发现其具有轴、径双向挤压回弹性,且重复挤压200次以上PGA仍然具良好的弹性。PGA对纯有机物的吸附量最高可达280g·g^(-1),且每克PGA吸附的有机物的体积为恒定值。

关键词：聚乙烯醇石墨烯气凝胶乳液弹性复合材料

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预防与治疗的经济学价值研究——以新冠肺炎为例

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经济评论 2020年第6期 125-141页

作者：余安然李向前张伟高秋萍天津财经大学金融学院 300222

在当前新冠肺炎疫情肆虐全球的严峻形势之下,本文从健康经济学的视角重新对预防还是治疗的问题进行了研究,利用统计生命价值(VSL)模型计算了不同健康改善措施的经济学价值,发现在理论上预防的价值更高。而后结合人们对疾病的不同认知,... 详细信息

在当前新冠肺炎疫情肆虐全球的严峻形势之下,本文从健康经济学的视角重新对预防还是治疗的问题进行了研究,利用统计生命价值(VSL)模型计算了不同健康改善措施的经济学价值,发现在理论上预防的价值更高。而后结合人们对疾病的不同认知,运用秩依效用框架(RDU)对基准模型进行了非线性加权和重新计算,结果发现认知偏差改变了预防与治疗的经济学价值,从而解释了为什么在实践中人们更重视治疗。在此基础上,本文使用冠状病毒类疾病的参数,进行了数值模拟和具体分析,发现认知偏差确实将治疗的价值放大了更多倍。实际上,针对新冠肺炎疫情,应该更重视预防环节,这也是下一阶段疫情防控的重点。

关键词：预防治疗经济学价值新冠肺炎

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深层脆性页岩水平井裸眼完井井壁稳定性研究

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西南石油大学学报（自然科学版） 2019年第6期41卷 51-59页

作者：孟英峰刘厚彬余安然胡永章邓元洲油气藏地质及开发工程国家重点实验室·西南石油大学四川成都610500 中国石化西南油气分公司石油工程技术研究院四川德阳618008 四川川庆石油钻采科技有限公司四川广汉618300

常规页岩气储层改造工艺为套管射孔与多级压裂改造相结合,施工成本高、周期长,若实施水平井段裸眼完井可一定程度降低成本、缩短周期,但水平裸眼井段井壁稳定是实施裸眼完井的前提条件。通过对威荣地区龙马溪组页岩水理化及力学性能进... 详细信息

常规页岩气储层改造工艺为套管射孔与多级压裂改造相结合,施工成本高、周期长,若实施水平井段裸眼完井可一定程度降低成本、缩短周期,但水平裸眼井段井壁稳定是实施裸眼完井的前提条件。通过对威荣地区龙马溪组页岩水理化及力学性能进行实验研究,结合建立的裸眼完井理论模型评价威荣地区页岩水平段裸眼完井井壁稳定性。结果表明,龙马溪组页岩为脆性层理页岩,岩体较为致密,力学强度高,力学各向异性明显;现场油基、水基钻井液对岩石膨胀性能及力学性能的改变不明显,现场所用钻井液与该地层配伍程度高;井眼轨迹、层理缝走向、力学各向异性等可对裸眼井段稳定性产生影响,致使不同方向井筒内应力差异明显,沿最小水平主应力方向钻水平井井壁稳定性最好,完井工况下井壁坍塌压力当量密度在1.26 g/cm^3,完井投产初期井壁存在轻微崩落掉块,但崩落范围小于30°,判断认为威荣区块龙马溪组页岩地层可考虑采用水平井裸眼完井方式。

关键词：脆性页岩膨胀性能裸眼完井井壁稳定

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软模板法石墨烯气凝胶的可控制备及其吸油性能

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化工进展 2020年第7期39卷 2742-2750页

作者：刁帅刘会娥陈爽于安然许文龙张广智中国石油大学(华东)重质油国家重点实验室山东青岛266580 中国石油大学(华东)地球科学与技术学院山东青岛266580

以环己烷为油相,氧化石墨烯(GO)为稳定剂,采用Pickering乳液法制备石墨烯气凝胶,利用电子显微镜对Pickering乳液进行表征,利用扫描电镜(SEM)、傅里叶红外光谱(FTIR)、拉曼光谱(Raman)、X射线衍射(XRD)对制得的石墨烯气凝胶进行表征。对... 详细信息

以环己烷为油相,氧化石墨烯(GO)为稳定剂,采用Pickering乳液法制备石墨烯气凝胶,利用电子显微镜对Pickering乳液进行表征,利用扫描电镜(SEM)、傅里叶红外光谱(FTIR)、拉曼光谱(Raman)、X射线衍射(XRD)对制得的石墨烯气凝胶进行表征。对比Pickering乳液的液滴大小与气凝胶的孔径大小可知,通过软模板法实现了对气凝胶的孔径控制,通过控制均质机的转速来调控气凝胶的孔径大小,当均质机转速分别为10000r/min、12000r/min和15000r/min时,所得石墨烯气凝胶的孔径分别为45μm、35μm和30μm左右,通过调节油水比实现了气凝胶的密度与孔隙率的控制,油水比越大,所得气凝胶的密度越小,孔隙率越大,通过延长还原时间可增强石墨烯气凝胶的机械性能。将所得气凝胶用于油品的吸附,可快速吸附水上浮油及水底重油,而且几乎不吸附水;对同一油品而言,气凝胶的吸附能力与其制备时的油水比呈正相关,采用挤压的方式实现石墨烯气凝胶的循环利用,经过10次循环再生后气凝胶的吸附能力仅有15%的损失。

关键词：石墨烯气凝胶 Pickering乳液孔径调控机械性能吸附

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