作为一类重要的光电极材料,α-Fe2O3在太阳能转化方面有着潜在的应用前景。但是,光生电子空穴对的再复合导致α-Fe2O3的光电量子产率很低。为了抑制光生电子空穴对的再复合,提高α-Fe2O3的光电量子产率,采用Spin-coating方法在透明导电...作为一类重要的光电极材料,α-Fe2O3在太阳能转化方面有着潜在的应用前景。但是,光生电子空穴对的再复合导致α-Fe2O3的光电量子产率很低。为了抑制光生电子空穴对的再复合,提高α-Fe2O3的光电量子产率,采用Spin-coating方法在透明导电玻璃FTO(SnO2∶F)衬底上制备了SrTiO3/α-Fe2O3异质结薄膜光电极,并对该光电极进行了XRD、SEM、紫外-可见透射光谱的表征。在三电极光电化学测试系统中对薄膜的光电流-电压特性、入射光子电流转化效率(Incident photon to current efficiency,IPCE)对波长的依赖性进行了表征。在相同的Xe灯照射条件下,SrTiO3/α-Fe2O3异质结光电极的光电流及IPCE值大于单一的SrTiO3、α-Fe2O3各自的光电流及IPCE值,这与理论预测的结论一致。展开更多
A novel supramolecular gel electrolyte formed from two-component low molecular mass organogelators was developed and introduced into quasi-solid-state dye sensitized solar cell(QS-DSSC). This supramolecular gel electr...A novel supramolecular gel electrolyte formed from two-component low molecular mass organogelators was developed and introduced into quasi-solid-state dye sensitized solar cell(QS-DSSC). This supramolecular gel electrolyte system was prepared by using N,N?-1,5-pentanediylbis-dodecanamide and 4-(Boc-aminomethyl)pyridine as co-gelator. Furthermore, the morphologies of the two-component supramolecular gel electrolyte and single-component gel electrolyte were observed by the polarized optical light microscopy, and the charge transport property of the two-component supramolecular gel electrolyte and the kinetic processes of the electron transport/recombination were investigated by the intensity-modulated photocurrent spectroscopy/intensity-modulated photovoltage spectroscopy(IMPS/IMVS). The polarized optical microscopy(POM) revealed that the single-component gel electrolyte was formed as the rod-like fibers, whereas the fibers changed to branched structure in the two-component supramolecular gel electrolyte. Moreover, comparing with the single-component gel electrolyte based QS-DSSC, the electron transport is faster and the electron recombination at the Ti O2/electrolyte interface is slower in the two-component supramolecular gel electrolyte based QSDSSC. Consequently, an efficiency of 7.04% was obtained by the two-component supramolecular gel electrolyte based QSDSSC, which is higher than that of the single-component gel electrolyte based QS-DSSC(6.59%).展开更多
As an employment of surface plasmonic effect, the consequence of insertion of a layer of Ag clusters into polymer solar cell on the enhancement of light absorption and power conversion efficiency is investigated. Opti...As an employment of surface plasmonic effect, the consequence of insertion of a layer of Ag clusters into polymer solar cell on the enhancement of light absorption and power conversion efficiency is investigated. Optical analysis based on the finite-difference time-domain （FDTD） is performed with experiments to evaluate the effect of the interaction between the Ag clusters and incident light on light absorption in polymer solar cell. Ag clusters modify the light wave vector and the electromagnetic field inside the device is redistributed and enhanced. As a result, polymer solar cells achieve an overall increase in absorption, short-circuit current densitv, and power conversion efficiency.展开更多
TiO2 nanocrystalline porous films consisting of binary particles mixture (mean diameters of 12 and 100 nm) are capable of increasing the light absorption due to the possession of large specific surface area and light ...TiO2 nanocrystalline porous films consisting of binary particles mixture (mean diameters of 12 and 100 nm) are capable of increasing the light absorption due to the possession of large specific surface area and light scattering property. The simultaneous reduction of the film thickness leads to a decrease of the recombination loss during electron transport and an increase of the photocurrent efficiency.展开更多
文摘作为一类重要的光电极材料,α-Fe2O3在太阳能转化方面有着潜在的应用前景。但是,光生电子空穴对的再复合导致α-Fe2O3的光电量子产率很低。为了抑制光生电子空穴对的再复合,提高α-Fe2O3的光电量子产率,采用Spin-coating方法在透明导电玻璃FTO(SnO2∶F)衬底上制备了SrTiO3/α-Fe2O3异质结薄膜光电极,并对该光电极进行了XRD、SEM、紫外-可见透射光谱的表征。在三电极光电化学测试系统中对薄膜的光电流-电压特性、入射光子电流转化效率(Incident photon to current efficiency,IPCE)对波长的依赖性进行了表征。在相同的Xe灯照射条件下,SrTiO3/α-Fe2O3异质结光电极的光电流及IPCE值大于单一的SrTiO3、α-Fe2O3各自的光电流及IPCE值,这与理论预测的结论一致。
基金financially supported by the National Basic Research Program of China (2011CBA00700)External Cooperation Program of Chinese Academy of Sciences (GJHZ1220)+2 种基金the National High Technology Research and Development Program of China (2011AA050510)the National Natural Science Foundation of China (21103197, 21173227, 21403247, 61404142 and 21273242)the Program of Hefei Center for Physical Science and Technology (2012FXZY006)
文摘A novel supramolecular gel electrolyte formed from two-component low molecular mass organogelators was developed and introduced into quasi-solid-state dye sensitized solar cell(QS-DSSC). This supramolecular gel electrolyte system was prepared by using N,N?-1,5-pentanediylbis-dodecanamide and 4-(Boc-aminomethyl)pyridine as co-gelator. Furthermore, the morphologies of the two-component supramolecular gel electrolyte and single-component gel electrolyte were observed by the polarized optical light microscopy, and the charge transport property of the two-component supramolecular gel electrolyte and the kinetic processes of the electron transport/recombination were investigated by the intensity-modulated photocurrent spectroscopy/intensity-modulated photovoltage spectroscopy(IMPS/IMVS). The polarized optical microscopy(POM) revealed that the single-component gel electrolyte was formed as the rod-like fibers, whereas the fibers changed to branched structure in the two-component supramolecular gel electrolyte. Moreover, comparing with the single-component gel electrolyte based QS-DSSC, the electron transport is faster and the electron recombination at the Ti O2/electrolyte interface is slower in the two-component supramolecular gel electrolyte based QSDSSC. Consequently, an efficiency of 7.04% was obtained by the two-component supramolecular gel electrolyte based QSDSSC, which is higher than that of the single-component gel electrolyte based QS-DSSC(6.59%).
基金supported by the National Natural Science Foundation of China (No.61007056)the Research Fund for the Doctoral Program of Higher Education of China (No.20100101120048)+1 种基金the Fundamental Research Funds for the Central Universities (Nos.2009QNA5010 and 2010QNA6003)the Educational Office of Zhejiang Province (No.Y200803562)
文摘As an employment of surface plasmonic effect, the consequence of insertion of a layer of Ag clusters into polymer solar cell on the enhancement of light absorption and power conversion efficiency is investigated. Optical analysis based on the finite-difference time-domain （FDTD） is performed with experiments to evaluate the effect of the interaction between the Ag clusters and incident light on light absorption in polymer solar cell. Ag clusters modify the light wave vector and the electromagnetic field inside the device is redistributed and enhanced. As a result, polymer solar cells achieve an overall increase in absorption, short-circuit current densitv, and power conversion efficiency.
基金supported by the National Research Fund for the Basic Key Project(Grant No.G2000028205)the Knowledge Innovation Foundation of the Chinese Academy of Sciences(Grant No.KGCX2-303-02).
文摘TiO2 nanocrystalline porous films consisting of binary particles mixture (mean diameters of 12 and 100 nm) are capable of increasing the light absorption due to the possession of large specific surface area and light scattering property. The simultaneous reduction of the film thickness leads to a decrease of the recombination loss during electron transport and an increase of the photocurrent efficiency.
