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Perspective pubs.acs.org/JPCL ChargeRecombinationControlforHighEfficiencyQuantumDot SensitizedSolarCells KeZhao,ZhenxiaoPan,andXinhuaZhong* KeyLaboratoryforAdvancedMaterials,InstituteofAppliedChemistry,EastChinaUniversityofScienceandTechnology,Shanghai 200237,China ABSTRACT:Benefitingfromtheuniqueexcellentoptoelectronicpropertiesof quantumdotlightabsorbers,quantumdotsensitizedsolarcell(QDSCs)area promisingcandidateforthelow-costthird-generationsolarcells.Overthepastfew years,thepowerconversionefficiency(PCE)ofQDSCspresentsarapidevolution fromlessthan1%tobeyond8%.Chargerecombinationisregardedasoneofthemost significantfactorsinlimitingthephotovoltaicperformanceofQDSCs.Asignificant improvementinthePCEofQDSCshasbeenobtainedbychargerecombination control.Someeffectiveroutestosuppresschargerecombinationprocesses,suchas adoptingprepreparedhigh-qualityQDsensitizers,tailoringtheelectronicpropertiesof QDs,andinterfaceengineeringwiththeuseoforganicorinorganicthinlayer overcoatingthesensitizedphotoanodehavebeenoverviewedinthisperspective.Also, thepossibleaccessestobetterperformance(higherefficiencyandstability)ofthe QDSCshavebeenproposedonthebasisofachievementsobtainedpreviously. sapromisingcandidateforthelowcostthird-generationInQDSCs,aseriesofchargetransferprocesseshavetooccur Asolarcells,quantumdotsensitizedsolarcells(QDSCs)cooperativelysothattheelectricaloutputcanbeharnessed havebeingachievedasignificantprogressinphotovoltaicefficiently.AsshownbybluearrowsinFigure1a,excited performanceoverthepastfewyears,creatingaconsiderable improvementinpowerconversionefficiency(PCE)fromless − than1%tobeyond8%.14Theintrinsicexcellentpropertiesof QDsensitizerssuchastunablebandgap,highabsorption − coefficient,largedipolemoment,andsolutionprocessability57 makethemanoutstandinglight-absorbercandidate.Addition- ally,thepotentialofhotelectronextractionandmultiple excitongeneration(MEG)renderthetheoreticefficiencyof − QDSCsbeyondtheShockley−Queisserlimit.811 SystematicstudyonQDSCshasbeencarriedoutinthepast deca