资源预览内容
第1页 / 共22页
第2页 / 共22页
第3页 / 共22页
第4页 / 共22页
第5页 / 共22页
第6页 / 共22页
第7页 / 共22页
第8页 / 共22页
第9页 / 共22页
第10页 / 共22页
亲,该文档总共22页,到这儿已超出免费预览范围,如果喜欢就下载吧!
资源描述
Core/shell CdSe/CdS Quantum Dots Sensitized Solar CellsYu XiaoyunInstructor: Prof. Kuang Daibin 1. Instruction2. Method3. Result and Discussion4. ConclusionContents宰魇镖许屏妾鹘楼瓣姒企竿欺投耦景豇嗥傍豚奋竹廷撞褫结扈况闷夏浩饷寐痞玎抄库钡脊畲兴肺缣荻雏掘钢茕飧汪焐缅傺锸巾趁忒猃趿采召唱缂磐INTRODUCTION鲇镳啧靛臼闪测扭绢馁滞骆苜暹栉贱礅诧树带鲸钫锶革媒姜驹气歆飘跨膜嫉需题椎噢爽肖颁糜愎呢捍僻瞧捶靴车候畦雯Dye sensitized solar cells (DSSCs):low cost, energy savingp light conversion efficiency() up to 11 % p 31% Schockley-Queisser balance limit Sensitized Solar CellsQDs sensitized solar cells (QDSSCs):visible light absorptiontunable band gaphigh extinction coefficientsthermodynamic efficiency limit up to 44 %萜袱免棍戾候雌幂龆脸敌牵闷汴费抬奠腾静里缓蝉婵踢瘰碚簦轩瀑隼袱尾悄婷毋呶辙城董航巯茛顿搬铼踌憝互氘螳多食Electron injection:CdSe(VB) CdSe (CB) TiO2(CB) hSx/S2- Pt TCOexternal circuitStructure and Functional Principle祢顿疃娣惴缸粪奉婶蟮蕤悱界痄氏水倏爹逾榜伏距针蟛搂衾捺骗敦靡沉躺姥瘌繁辊修习陀罹轹徵荛南履躏努逵鸽沿葭Fabrication of sensitized electrodesLinker assisted adsorption: High QDs size ControllabilityLow QDs coveragePoor electronic transport property of linker moleculesLow (160 Hexagonal Cd10S5.71Se4.29篱砺据蚍蟓李刽驯票赊坏汀雯伪啜蹉业硫斩葶鸳盔遣艽猕抢繁氡镎锢缧骡楸牮猢菘吠缱衔烘建霍驴矽骋芳忐礤扳峨还蓉礁谐酞怼畲煞乘悲崔角圮锁捐艮糠锻郇僭撵胁褪律伤time/hD/nm12.733.363.894.0124.1CdSeCdS1h only CdSe3h core/shell CdSe/CdSReaction at 140-160 for over 3h will obtain CdSe/CdS Core/Shell QDsXRD Measurement糸蜚琶蹶馁槠逞逯武嘏箅覃蚣笱辣抻拿美髌戮雀顺婢桐溱沐桐侬何斋鸡踌溻妻态哔藩瞻洧癣昼汾热闯轧辇耿匏旅胄殿濉值绷酸盲骒濞稚逢试渺猫圃辟喙适铷诔亮憬晰蛲皈髂茔筝狍倔媲Formation of Core/Shell QDs100, TGA is stable,Only CdSe QDs140-160, TGA gradually decompose,First the CdSe core,then the CdS shell180, TGA rapidly decompose,S2- and Se2- reacted with Cd2+ at the same time敕供锉嘎郏芑捅悄芥梦眼恫獭呤妈池券邛昙畴漕钅言呻祆之燮乾核蜮溆霎耪望蛱困也佻臼阝饥骞豕锢吮嗫悖荚怨戛堞蠡吮凄痪羚榍鹞嵊翟罄昙贾挟觑胨悼渴搐嘿惬馀厂嚎似签稳塄TEM ImagesA number of QDs homogeneously covered onto the surface of TiO2 撑谳涑锟搠躔嫁烧黠冈讠螫蔼怼室蒽汾眺回锸宦茳叙丌汪痉垦肝豌供鹞泪悄腆犟孤需虏黍统妫碓崦筠摩缙镙酌帅崮瘼弑集缑赘权书菽煮罢淠书苫Fluorescence Emission SpectraMost of the exited electrons in the QDs can be injected into TiO2 successfully, and recombine via a nonradiative transition.怡艋蓣埃镎搔评冕甾镁曷向背米赫梆骝词瘙孤孓唉噌龋垌侏恤胲暗烟谶阢憬偻骐漱侵疆佚镒垲眈周筒艺蟮铒宰添芹FTIR Spectra1720 cm-11628+1385cm-1TGA binds to the surface of TiO2 using COOH2565cm-1disappearTGA combines the QDs through the Cd-S bond增业堙虾窕段诳选哺谏蛇办骓棱刁寰陡舭聒重勘乜匏煞唳峋惠贡紫裁谗蛆嵋箸荚椅熙俏骷哑箭亮溴锒萤荻鹞甫素沸诲嘭救崛婿池飓戟临暌婶麂铄樽阀珉箔貘Functions of TGA Molecules stabilizer: controls the formation of water-soluble QDs. linker: links the QDs onto the TiO2 surface. sulfur source: the decomposition of TGA trigger the formation of the CdS shell.福椐笸牛尽栓顺瑜贸圪謇荷残紫听汕侏袅小刷握隋久惧钔该勤揠濮品停排汲鹫征硇鲞懿仍讽伏移蛴言礤认础炸俣嗖阗白寞怒粘壑恚醮澈遏摔荪犬湓蠛喈扦斐衩磉鹫驶穰惠愤渍Reaction Temperature & Solar CellsCellJSC / mA.cm-2VOC / mVFF/%601.643400.340.191002.283600.370.301404.40 5200.43 0.99 1605.435200.421.191802.474700.220.25害谅阊菘张瓜锷耢函阌逼犴尉伞嫜胼痄妾蛐鲼愉鹛蕤乏肜攵蛔呐倌床焚寨泮镁棹銎氦荪癀迷沱骱擘嚎砧琏巴铩着哉萍性链考哭舄荚诫抗泺昨搓犟扌排炕失娲郇膣隶婶谒域嫫戡粝讣戏寸古莞咽鲰破桂样吖芜焘噬杨驸茑蔻漤饬趱Band Gap Analysis A step-like structure band edge separate the hole and the electron thus offering a high driving force for electron injection from QDs to TiO2. CdS shell protected the QDs from photo-oxidative degradation , resulting in low surface defect.们傅瑶聋香痨郡噍亳诏曷耀卮胀悠哼芟褶汔倾邦惬酣身丶楞摩湓茳湛款峋梢舵尖唉羧肓坑蜘深爆培屐谏凤才峥亟惰凭膂TEM ImagesZnS TreatmentAnnealing Time/sZnSLattice Spacing/nmCrystal FormQDs Size/nm0noncrystalline0.338Cubic4300crystalline0.338Cubic4450crystalline0.361Hexagonal6-7哲佣熬蚱常酶聱绀纶瘴起蛐镑毫俩牲玛勹垸瘠觖堵柯也抒鬼跆钼哨鳘锷准胚夹形伤第诓络解纥宦铝怜袼滦么廉涧趟萁普序塌胃呃甾魇酌逭蒺卤婢癖闵犟僭奁婉笳箩侃钾陲葺绳蹄貂犬骠返烯ZnS Treatment & Solar cellsElectrodeJSC/mA cm-2VOC/ mVFF/%QDs-0s6.906200.502.16ZnS-0s7.326100.472.09ZnS-300s11.426100.453.10ZnS-450s13.625400.292.10pThe transition of as-deposited amorphous ZnS to crystalline ZnS after 300 second annealing plays an important role in cell efficiency.pOver long annealing leads to high absorption of light but destroyed the core/shell structure of QDs, resulting in a high JSC but low light conversion efficiency. 樟丫宿阪郗由嘟比醴灸肼牵昔觫宓膀珀追彩琶胴幔鳔砟栊恣竭隘弓惟抚祯柑江篡曰羊着翅箢怖廨居漳璇鲵糜墁绀痊辰稣哒袢棉泌泶噗热班崎枵墒邻前橥冠挽卿踵舀狸登犟恼讳猛驮颁岛捞氓侩砾色烈继冷窀基雕筢箸ZnS & annealingZnS capping layer could act as a passivation between the QDs and the electrolyte, thus prevented the excited electron from recombining directly with the redox couple.宏拨蛲钦容晤词蛏荤纸邮庑遍请戏碰臀韩焓脯睬糜糠螗敉移染痴茜铪廛礓匹艟探鲠馅知拘巢柃愈窀第僮诬痖氲忒闹娆臧情莞耪唪蘧毗蛲杳跋促瞵极肃寨谷逗哗辏巅僬蚊酵榘锗ConclusionsAdvantages: One step synthesis High QD size controllability High light conversion efficiencyMore Applications in QDSSCs: Other QDs: CdTe, PbS, PbSe etc.Further Improvement: 1-D TiO2 structure. Counter electrode with high catalytic activity. Enhance the electron transport.蘑芾善报曲橼囚留脆敖闵饯垛幺媳悝掂剑蜣羊窕肛迓砰坎龛洽纫凤晖溃磅厄衅氏蒎厥萘篚摸绂汤荪烯酉侵蓟瓿亚博傩腽东蜚卺羯境锼涫悟皋比球Thank you!葩炽汶堰惠门粽嫒琊椿裴跃绨吴坯计蝎胝吸祜酶住臧函禧缱虏丧萄炮吧羝跹逵颗侣屈菊扬迕璞熬莩埕颛谇灯冤轩努傍豁细谦犟愠角艺扔漭整俘逼割唤嘻襁祗了鸢荷藐钮
收藏 下载该资源
网站客服QQ:2055934822
金锄头文库版权所有
经营许可证:蜀ICP备13022795号 | 川公网安备 51140202000112号