2020-2022 YAMAGATA UNIVERSITY Research Seeds Collection
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Toughening and transparentizing of crystalline gels3D printing of crystalline gels76Back electrodeFig. 1SEM micrograph of moth eye structure.(Each cone has 500-700 nm height.)(a) Without light managementIncrease inefficiencyby 8.3%GlassActive layerFront electrodeReflected lightIncident lightFig. 2Illustrations of the device structure of an OPV cell (top) and the optical mechanism for light trapping (bottom).(b) With light managementHole transporting layerBack electrodeIncident lightEnhanced light absorptionBack electrodeMoth eyeOPVContentSpecial objectivesWeareagroupofmaterialsscientists/engineerswhoareinterestedincreatingnewfunctionalizedgelsforvariousapplications. We are a group of materials scientists/engineers who are Feelfreetovisitusorcontactusifyouareinterestedinourinterested in creating new functionalized gels for various researchorjustourlab.applications.  Feel free to visit us or contact us if you are interested in our research or just our lab.Yamagata UniversityGraduate School of Science and Engineering Research Interest:Gel, Material Science, 3D PrintingYamagata University Graduate School of Science and Engineering E-mail :jingong@yz.yamagata-u.ac.jpResearch InterestTel :+81-238-26-3135Gel, Material Science, 3D PrintingFax:+81-238-26-3248E-mail ・ jingong@yz.yamagata-u.ac.jpTel ・ +81-238-26-3135HP :http://gong-lab.yz.yamagata-u.ac.jp/Fax ・ +81-238-26-3248HP・http://gong-lab.yz.yamagata-u.ac.jp/Content:ContentOrganicphotovoltaics(OPVs)areexpectedaslow-costpowergenerationdevicesforthenearfuture.Toimprovetheperformance Organic photovoltaics (OPVs) are expected as low-cost ofOPVs,weaddressthelightmanagementwithmotheyesurface,power generation devices for the near future. To improve whichisaperiodicarrayofconeswiththeheightofseveralhundredthe performance of OPVs, we address the light management nanometers.Wehavedevelopedasimulationmethodtoanalyzethewith moth eye surface, which is a periodic array of cones 3-dimensionalopticalflowwithintheOPVcell.Byapplyingthiswith the height of several hundred nanometers. We have developed a simulation method to analyze the 3-dimensional methodtodesignmotheyestructure,wehaveattained8.3%relativeoptical flow within the OPV cell. By applying this method to increaseinthesolarcellefficiency.Inthedevelopeddevice,thedesign moth eye structure, we have attained 8.3% relative incidentlightcanbebentbythemotheyeandefficientlytrappedincrease in the solar cell efficiency. In the developed device, withinthephotoactivelayer.Thiscanprolongthelengthofopticalthe incident light can be bent by the moth eye and efficiently pathpassingthoughtheactivelayer,promotinglightabsorption.Thetrapped within the photoactive layer. This can prolong the motheyehasbeenfabricatedbynanoimprintlithography,whichislength of optical path passing though the active layer, adequateforproducinglarge-areananostructurescosteffectively.promoting light absorption. The moth eye has been fabricated by nanoimprint lithography, which is adequate for Appealing point:producing large-area nanostructures cost effectively.frombothWearestudyinglightmanagementofOPVscomputationalandexperimentalapproaches.WearewillingtoSpecial objectivescollaboratewithotherresearchersandcompanies. We are studying light management of OPVs from both computational and experimental approaches. We are willing to Yamagata UniversityGraduate School of Science and Engineering collaborate with other researchers and companies.Research Interest :Organic electronicsYamagata University Graduate School of Science and EngineeringE-mail :kubota@yz.yamagata-u.ac.jpResearch InterestTel :+81-238-26-3766Organic electronicsFax:+81-238-26-3299E-mail ・ kubota@yz.yamagata-u.ac.jpTel ・ +81-238-26-3766HP :http://www.matheng.yz.yamagata-u.ac.jp/Fax ・ +81-238-26-3299HP・http://www.matheng.yz.yamagata-u.ac.jp/ Content: Our current research interest is centered around the Ourcurrentresearchinterestiscenteredaroundthefunctionalizedfunctionalized crystalline polymer gels with large stretchability, crystallinepolymergelswithlargestretchability,selfshrinkage,self shrinkage, stimulative healing, thermal sensitivity, and stimulativehealing,thermalsensitivity,andthermalenergystorage,thermal energy storage, particularly challenging their synthesis particularlychallengingtheirsynthesisandfabricationmethodsofand fabrication methods of particle, fiber, porous membrane, particle,fiber,porousmembrane,nonwovenfaricand3Dobjects.nonwoven faric and 3D objects. 3Dprintingtechnologyprovidesapossiblemethodtomanufactureobjectswithcomplexandprecisestructures.Oneofourmaingoals 3D printing technology provides a possible method to istotestthe3Dprintingperformanceofcrystallinegelsviamask-manufacture objects with complex and precise structures. One projectionstereolithography(SLA)tomaketheir3Dobjectsdirectlyof our main goals is to test the 3D printing performance of fromreactiveliquidresin.crystalline gels via mask-projection stereolithography (SLA) to make their 3D objects directly from reactive liquid resin.Appealingpoint:Light Management Technology for Organic PhotovoltaicsAssociate ProfessorShigeru Kubota Light Management Technology for Organic PhotovoltaicsFunctionalized Crystalline GelsFunctionalized Crystalline GelsAssociate Professor Shigeru KubotaAssociate Professor Jin GongAssociate Professor JinGONG

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