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Science China(Physics,Mechanics & Astronomy) 2015年第3期58卷 76-81页

作者： DING JianNing CHEN MengJiao QIU JianHua yuan ningyi Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Center for Low-Dimensional Materials Micro-Nano Devices and Systems Changzhou University Jiangsu Key Laboratory for Solar Cell Materials and Technology Changzhou University

To study the ferroelectric photovoltaic effect based on polycrystalline films, preparation of high-quality polycrystalline films with low leakage and high remnant polarization is essential. Polycrystalline BiFeO3 （BFO） thin films with extremely large remnant polarization （2Pr = 180 ~aC/cm2） were successfully deposited on glass substrates coated with indium tin oxide using a modified radio frequency magnetron sputtering method. Symmetric and asymmetric cells were constructed to investigate the ferroelectric photovoltaic effect in order to understand the relationship between polarization and photovoltaic response. All examined cells showed polarization-induced photovoltaic effect. Our findings also showed that the ferroelectric photovoltaic effect is highly dependent on the material used for the top electrode and the thickness of the polycrystalline film.

关键词： polycrystalline BiFeO3 photovoltaic effect ferroelectric solar cells Indium tin oxide substrate

Thermocapillary migration mechanism of molten silicon droplets on horizontal solid surfaces

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Friction 2018年第1期6卷 62-74页

作者： Tao SUN Cunhua JIANG Jianning DING ningyi yuan School of Mechanical Engineering Changzhou University Collaborative Innovation Center of Photovoltaic Science and Engineering the Breeding Construction Point of State Key Laboratory of Photovoltaic Engineering Science

Effective lubrication under extreme conditions such as high temperature is of considerable importance to ensure the reliability of a mechanical system. New lubricants that can endure high temperatures should be studied and employed as alternatives to traditional oil-based lubricant. In this paper, a thermocapillary model of a silicone-oil droplet is developed by solving the Navier–Stokes and energy equations to obtain the flow, pressure, and temperature fields. This is accomplished using a conservative microfluidic two-phase flow level set method designed to track the interface between two immiscible fluids. The numerical simulation accuracy is examined by comparing the numerical results with experimental results obtained for a silicone-oil droplet. Hence, the movement and deformation of molten silicon droplets on graphite and corundum are numerically simulated. The results show that a temperature gradient causes a tension gradient on the droplet surface, which in turn creates a thermocapillary vortex. As the vortex develops, the droplet migrates to the low-temperature zone. In the initial stage, the molten silicon droplet on the corundum substrate forms two opposite vortex cells, whereas two pairs of opposite vortices are formed in the silicone fluid on the graphite substrate. Multiple vortex cells gradually develop into a single vortex cell, and the migration velocity tends to be stable. The greater the basal temperature gradient, the stronger the internal thermocapillary convection of the molten silicon droplet has, which yields higher speeds.

关键词： molten silicon droplet temperature gradient thermocapillary migration

Photovoltaic molecules based on vinylene-bridged oligothiophene applied for bulk-heterojunction organic solar cells

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Journal of Energy Chemistry 2018年第2期27卷 426-431页

作者： Jing Zhang Pan Yin Linjun Xu Ping Shen Mingfu Ye ningyi yuan Jianning Ding School of Material Science & Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science & Engineering Changzhou University Changzhou 213164 Jiangsu China College of Chemistry and Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education Xiongtan University Xiangtan 411105 Hunan China School of Chemistry and Chemical Engineering Anhui University of Technology Maanshan 243002 Anhui China

We have synthesized two photovoltaic molecules（HEX-3TVT-ID and EH-3TVT-ID） based on vinylenebridged oligothiophene applied as donor for the solution-processable bulk-heterojunction organic solar cells（OSCs）. Vinylene unit was introduced as π-bridge in the oligothiophenes with 1,3-indenedione as end group and 4,4’-dihexyl-2,2’：5’,2’-terthiophene or 3’,4’-di（octan-3-yl）-2,2’：5’,2’-terthiophene as core,respectively. Due to the different substituent positions of the alkyl group relative to the vinylene unit in the terthiophene, HEX-3TVT-ID and EH-3TVT-ID show different optical and electrochemical properties, corresponding to the photovoltaic performance of the OSCs devices. The power conversion efficiency（PCE） of the OSCs based on a blend of HEX-3TVT-ID and PC71BM（1：0.8, weight ratio, 0.5% CN） reached 2.3%. In comparison, the OSCs based on the blend of EH-3TVT-ID and PC71BM in the weight ratio of 1：1 without the additive show a higher PCE of 2.7%, with a typically high VOC of 0.93 V, under the illumination of AM 1.5, 100 mW cm-2.

关键词： Organic solar cells Photovoltaic organic molecules Vinylene-bridged oligothiophene

Multi-functional stretchable and flexible sensor array to determine the location, shape, and pressure: Application in a smart robot

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Science China(Technological Sciences) 2018年第8期61卷 1137-1143页

作者： HAN LiBiao DING JianNing WANG Shuai XU Jiang yuan ningyi CHENG GuangGui LIU ZunFeng Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Micro/Nano Science and Technology Center Jiangsu University State Key Laboratory of Medicinal Chemical Biology Key Laboratory of Functional Polymer

The rapid increase in the aging population prompts the development of wearable devices and sophisticated robots. With their ability to collect complex information about their surroundings via e-skins, robots could perform more dynamic and variable tasks such as rescue missions or caring for the elderly. In this paper, we present a new concept of utilizing a very simple, highly flexible and stretchable capacitor sensor array, that can be attached on the surface of a retractable robot hand to realize three functions: determining the location, shape, and pressure of an object. This adaptive sensing system is accomplished using capacitors connected by aligned carbon nanotube(CNT) films constructed on an elastomer dielectric material, which can reduce the requirement on the accuracy of the machine vision system. This study has a very broad application in the manufacture of intelligent software robots.

关键词： sensor array stretchable location shape pressure

Anti-solvent engineering for efficient semitransparent CH3NH3PbBr3 perovskite solar cells for greenhouse applications

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Journal of Energy Chemistry 2019年第7期28卷 12-19页

作者： Waqas Siddique Subhani Kai Wang Minyong Du Xiuli Wang ningyi yuan Jianning Ding Shengzhong(Frank)Liu Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of the Chinese Academy of Sciences Beijing 100039China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina Jiangsu Key Laboratory for Photovoltaic Engineering and Science Changzhou UniversityChangzhou 213164.Jiangsu.China

With ideal combination of benefits that selectively converts high photon energy spectrum into electricity while transmitting low energy photo ns for photos yn thesis,the CH3NH3PbBr3 perovskite solar cell(BPSC)is a promising candidate for efficient greenhouse based building integrated photovoltaic(BIPV)***,the efficiency of BPSCs is still much lower than their theoretical *** general,interface band alignment is regarded as the vital factor of the BPSCs whereas only few reports on enhancing perovskite film *** this work,highly efficient BPSCs were fabricated by improving the crystallization process of CH3NH3PbBr3 with the assistance of anti-solvents.A new anti-solvent of diphenyl ether(DPE)was developed for its strong interaction with the solvents in the perovskite precursor *** using the anti-solvent of DPE,trap-state density of the CH3NH3PbBr3 film is reduced and the electron lifetime is enhanced along with the large-grain crystals compared with the samples from conventional anti-solvent of *** preliminary optimization,the efficiencies of typical and semitransparent BPSCs are improved to as high as 9.54%and 7.51%,*** absorption measurement demonstrates that the cell without metal electrode shows 80%transparency in the wavelength range of 550-1000 nm that is perfect for greenhouse *** that the cell absorbs light in the blue spectrum before 550 nm,it offers very high solar cell efficiency with only 17.8%of total photons,while over 60%of total photons can transm让through for photosynthesis if a transparent electrode can be obtained such as indium doped SnO2.

关键词： CH3NH3PbBr3 Semitransparent perovskite solar cell Anti-solvent Greenhouse

Self-assembled CoOOH on TiO_(2) for enhanced photoelectrochemical water oxidation

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Journal of Energy Chemistry 2021年第9期30卷 512-521页

作者： Xiangrong Ren Yujin Ji Yiyue Zhai ningyi yuan Jianning Ding Youyong Li Junqing Yan Shengzhong Frank Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119ShaanxiChina Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123JiangsuChina iChEM Dalian Institute of Chemical PhysicsUniversity of Chinese Academy of SciencesChinese Academy of SciencesDalian 116023LiaoningChina School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringJiangsu Cultivation Base for State Key Laboratory of Photovoltaic Science and TechnologyChangzhou UniversityChangzhou 213164JiangsuChina

Providing efficient charge transfer through the interface between the semiconductor and co-catalyst is greatly desired in photoelectrocatalytic (PEC) energy ***,we excogitate a novel and facile means,via electrochemical activation,to successfully load the amorphous CoOOH layer architecture onto the surface of TiO_(2).Intriguingly,the as-obtained 6%CoOOH-TiO_(2)photoelectrode manifests optimal PEC performance with a high photocurrent density of 1.3 mA/cm~2,3.5 times higher than that of pristine TiO_(2).Electrochemical impedance spectroscopy (EIS),Tafel analysis and cyclic voltammetry (CV) methods show that the carrier transfer barrier within the electrode and the transition of Co^(3+)OOH to Co^(4+)OOH have the dominating effects on the PEC *** calculation reveals that the interface between the CoOOH and TiO_(2)improves the homogeneity of effective d-orbital electronic-transfer ability among Co *** research sheds light on the water oxidation reaction and the design of more favorable PEC cocatalysts.

关键词： Amorphous Co-catalyst Water oxidation Mechanism TiO_(2)

Fabrication and tribological properties of superhydrophobic nickel films with positive and negative biomimetic microtextures

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Friction 2014年第3期2卷 287-294页

作者： Ying WANG Jing YANG Xiaobao GUO Qiang ZHANG Jingyu WANG Jianning DING ningyi yuan Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering Changzhou UniversityChangzhou 213164JiangsuChina Jiangsu Key Laboratory for Solar Cell Materials and Technology Changzhou UniversityChangzhou 213164China Center for Low-Dimensional Materials Micro-Nano Devices and SystemsChangzhou UniversityChangzhou 213164JiangsuChina School of Materials Science and Engineering Changzhou UniversityChangzhou 213164China

Nickel(Ni)films with positive and negative textured surfaces of lotus and rice leaf patterns were fabricated through an inexpensive and effective *** as-prepared Ni films were superhydrophobic and exhibited excellent tribological properties after chemical *** results indicated that the water contact angles(WCAs)on the surfaces of biomimetic textured Ni films(approximately 120°)were far greater than those on smooth films(65°).The biomimetic textured surfaces became superhydrophobic(WCA of approximately 150°)after perfluoropolyether(PFPE)treatment,which could be due to the combined effects of the special texture and the *** as-prepared biomimetic-textured Ni films modified with PFPE were improved with a low friction coefficient and excellent antiwear properties,which were due to the combination of the effective lubrication of PFPE and the special textures that served as a good lubricant and a debris ***,the antiwear properties of the as-prepared Ni films with negative biomimetic microtextures modified with PFPE were much better than those of films with positive biomimetic microtextures modified with PFPE.

关键词： nickel positive negative bio-mimicking superhydrophobic friction

Bis(4-methylthio)phenyl)amine-based hole transport materials for highly-efficient perovskite solar cells: insight into the carrier ultrafast dynamics and interfacial transport

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Science China Chemistry 2020年第6期63卷 827-832页

作者： Xuguang Jia Yi Zhang Jing Zhang Quan Sun Huafei Guo Yikai Wang Shuai Zhang ningyi yuan Jianning Ding School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and EngineeringJiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and TechnologyChangzhou UniversityChangzhou 213164China College of Energy and Electrical Engineering Hohai UniversityNanjing 210098China Micr/Nano Science and Technology Center Jiangsu UniversityZhenjiang212013China

Hole transport layers(HTLs)play a significant role in the performance of perovskite solar cells.A new class of linear smallmolecules based on bis(4-methylthio)phenyl)amine as an end group,carbon,oxygen and sulfur as the center atoms for the center unit(denoted as MT-based small-molecule),respectively,have been applied as HTL,and two of them presented the efficiency over 20%in the planar inverted perovskite solar cells(PSCs),which demonstrated a significant improvement in comparison with the widely used HTL,poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(known as PEDOT:PSS),in the planar inverted *** ultrafast carrier dynamics show that the excited hot carrier cooling process of MT-based small-molecule HTL samples is faster than that of PEDOT:PSS *** kinetic analysis of photo-bleaching peaks of femtosecond transient absorption spectra reveals that the traps at the interface between MT-based small-molecule HTLs and MAPbI3 can be filled much quicker than that at PEDOT/MAPbI3 ***,the hole injection time from MAPbI3 to MT-based small-molecule HTLs is around 10 times quicker than that to PEDOT:*** quick trap filling and hole extraction bring a significant enhancement in photovoltaic *** findings uncover the carrier transport mechanisms and illuminate a promising approach for the design of new HTLs for highly-efficient perovskite solar cells.

关键词： perovskite solar cell hole transport layer ultrafast carrier dynamics

Crystallization tailoring of cesium/formamidinium double-cation perovskite for efficient and highly stable solar cells

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Journal of Energy Chemistry 2020年第9期29卷 217-225,I0007页

作者： Jianchao Yang Yu Chen Weijian Tang Shubo Wang Qingshan Ma Yihui Wu ningyi yuan Jianning Ding Wen-Hua Zhang Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology Changzhou UniversityChangzhou 213164JiangsuChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering Physics596 Yinhe RoadChengdu 610200SichuanChina Miro/Nano Science and Technology Center Jiangsu UniversityZhenjiang 212013JiangsuChina

Achieving high-quality perovskite crystal films is a critical prerequisite in boosting solar cell efficiency and improving the device stability,but the delicate control of nucleation and growth of the perovskite film remains limited ***,a facile but effective strategy has been developed to finely tailor the crystallization of thermally stable cesium/formamidinium(Cs/FA)based perovskite via partially replacing PbI2 with PbCl2 in the precursor *** incorporation of chlorine into the perovskite crystal lattice derived from PbCl2 changes the crystallization process and improves the crystal quality,which further results in the formation of larger crystal grains compared to the control *** larger crystal grains with high crystallinity lead to reduced grain boundaries,suppressed non-radiative recombination,and enhanced photoluminescence *** the optimized conditions,the methylammonium free perovskite solar cells(PSCs)delivers a champion power conversion efficiency(PCE)of 21.30%with an open-circuit voltage as high as 1.18 V,which is one of the highest efficiencies for Cs/FA based PSCs up to ***,the unencapsulated PSC devices retain more than 95%and 81%of their original PCEs even after long-term(over one year)storage under ambient conditions or 2000 h’s thermal aging at 850C in a nitrogen atmosphere,respectively.

关键词： Crystallization tailoring Crystal quality Stability Perovskite solar cells

Structural phase transition, optical and pyroelectric properties of lead-free single crystals

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Chinese Science Bulletin 2013年第33期58卷 4064-4071页

作者： FANG BiJun WANG Meng yuan ningyi DING JianNing ZHAO XiangYong XU HaiQing LUO HaoSu School of Materials Science and Engineering Changzhou University School of Materials Science and Engineering Jiangsu University Key Laboratory of Inorganic Function Material and Device Chinese Academy of Sciences

0.14 at%Mn-doped 0.95(Na1/2Bi1/2)TiO3-0.05BaTiO3(0.95NBT-0.05BT)lead-free single crystals were grown by a top-seeded solution growth method(TSSG).X-ray powder diffraction measurement showed that the as-grown single crystals exhibit rhombohedral perovskite structure with apparent *** the increase of temperature,successive structural phase transitions occur in the Mn-doped 0.95NBT-0.05BT single *** poling,apparent dielectric anomaly is induced accompanied by the increase of the character of diffuse phase transition and the decrease of the value of dielectric *** Mn-doped0.95NBT-0.05BT single crystals exhibit complex domain structure,in which micro and macro domains coexist with statistically 4mm *** Mn-doped 0.95NBT-0.05BT lead-free single crystals exhibit excellent piezoelectric and pyroelectric properties,which will lead to promising advance in piezoelectric and pyroelectric *** infrared-absorption band occurred around 630.6 cm 1can be assigned to the"stretching"normal vibration of[Na1/2Bi1/2]/Ti-O *** three diffused Raman bands centered around 300,560 and 800 cm 1can be attributed to F2g[TiO6]bending vibration,A1g[TiO6]stretching vibration and"soft mode"mixed by bending and stretching vibrations.

关键词：结构相变热释电性能单晶无铅 X-射线粉末衍射溶液生长法 Mn掺杂弯曲振动