The Study Of Polymer Solar Cells Based On Quantum Dots Doping

In the past few years,in order to solve the energy crisis and environmental issues,much research has been focused on solar cells.Compared to their inorganic counterparts,organic solar cells(OSCs)possess more potential such as low cost,large area,flexibility,and lightweight.However,the low power con-version efficiency(PCE)is still a crucial role for the commercial use of OSCs.How to improve the PCE of OSCs is still a focus issue,which has been got increasing attention.The PCE of solar cells is decided by open-circuit voltage(Voc),fill factor(FF),and short-circuit current density(Jsc).Therein,Voc is mainly related to the work function of cathode,energy level gaps,and morphology of blended active layers.The Jsc and FF are affected by many complicated factors,including incident light intensity and internal conversion efficiency which consists of separation and recombination of exciton and carrier mobility.The key to the success of PCE is the development of high performance materials possessing well matched photon-absorption with the solar spectrum,an efficient photoexcited charge separation to prevent electron–hole recombination and an adequate energy of charges that carry out the desired chemical reactions?This is the aim of paper.In this work,poly(9,9-dioctylfluorene)-co-(4,7-di-2-thienyl-2,1,3-benzothiadiazole)(PF-5DTBT)and copolymer poly(styrene-co-maleic anhydride)(PSMA)dots were prepared as additive for active layer doping to enhance the power conversion efficiency(PCE)of organic solar cells(OSCs),which based on poly[N-9?-hepta-decanyl-2,7-carbazole-alt-5,5-(4?,7?-di-2-thienyl-2?,1?,3?-benzothiadia zole)(PCDTBT)and [6,6]-phenyl C71 butyric acid methyl-ester(PC71BM).A high efficiency of 7.40% was achieved due to increase of short-circuit current(Jsc)and fill factor(FF).The operation mechanism of OSCs doping with polymer dots was investigated,which demonstrated that the efficiency enhancement ascribes to improvement of electrical properties,such as exciton generation,exction dissociation,charge transport,and charge collection.We researched the role of Cadmium-Free Quantum Dots in polymer solar cells.The utilization of inorganic nanocrystals is one of the key strategies to improve the performance of polymer solar cells(PSCs).In this paper,Cu In S2/Zn S(CIS-Z)quantum dots(QDs)were employed to improve efficiency of PSCs composed of poly [N-9?-hepta-decanyl-2,7-carbazolealt-5,5-(4?,7?-di-2-thienyl-2?,1?,3?-ben-zothiadiazole)](PCDTBT)/fullerene derivative [6,6]-phenyl-C70-butyric acid methyl ester(PC71BM).The maximum power conversion efficiency of 7.19% was achieved,accounting for 21.6% enhancement compared to the control device.The incorporation of CIS-ZQDs allowed not only enhancing exciton generation and dissociation but also improving charge transport property,leading to a higher short-circuit current density and fill factor.