Approach to highly efficient dye-sensitized solar cells(DSSCs)by co-sensitization of organic dyes,AZ6+AZ5 with co-adsorbent chenodeoxycholic acid(CDCA)is presented.The power conversion efficiencies(PCEs)of 8.55%and 8....Approach to highly efficient dye-sensitized solar cells(DSSCs)by co-sensitization of organic dyes,AZ6+AZ5 with co-adsorbent chenodeoxycholic acid(CDCA)is presented.The power conversion efficiencies(PCEs)of 8.55%and 8.31%are obtained from DSSCs co-sensitized by AZ6(0.3 mmol/L)+AZ5(0.1 mmol/L)with CDCA concentration of 5 and 20 mmol/L in one step cocktail,respectively.The latter shows high stability in a period of 653 h under ambient conditions.展开更多
Herein, we report the design and synthesis of three new D-A type metal-free carbazole based dyes（S1-3）as effective co-sensitizers for dye-sensitized solar cell（DSSC） sensitized with Ru（Ⅱ） complex（NCSU-10）.In ...Herein, we report the design and synthesis of three new D-A type metal-free carbazole based dyes（S1-3）as effective co-sensitizers for dye-sensitized solar cell（DSSC） sensitized with Ru（Ⅱ） complex（NCSU-10）.In this new design, the electron rich carbazole unit was attached to three different electron withdrawing/anchoring species, viz. 4-amino benzoic acid, sulfanilic acid and barbituric acid. The dyes were characterized by spectral, photophysical and electrochemical analysis. Their optical and electrochemical parameters along with molecular geometries, optimized from DFT have been employed to apprehend the effect of the structures of these co-sensitizers on the photovoltaic performances. Further, S1-3 dyes were co-sensitized along with a well-known NCSU-10 dye in order to broaden the spectral response of the co-sensitized devices and hence improve the efficiency. The photovoltaic performance studies indicated that, the device fabricated using S1 dye as co-sensitizer with 0.2 mM of NCSU-10 exhibited improved PCE of 9.55% with JSC of 22.85 mA cm-2, VOC of 0.672 V and FF of 62.2%, whereas the DSSC fabricated with dye NCSU-10（0.2 mM） alone displayed PCE of 8.25% with JSC of 20.41 mA cm-2, VOC of 0.667 V and FF of 60.6%. Furthermore, electronic excitations simulated using time-dependent DFT, were in good agreement with the experimentally obtained results of the co-sensitizers, indicating that the exchange-correlation function and basis set utilized for predicting the spectra of the co-sensitizers are quite appropriate for the calculations. In conclusion, the results showed the potential of simple organic co-sensitizers in the development of efficient DSSCs.展开更多
Herein,a dual near-infrared(NIR)-response AgInS_(2)and CuInS_(2)co-sensitized ZnO photoelectrode array consisting of two spatial-resolved paper working electrodes(PWE1and PWE2)was established to enable paper-based rat...Herein,a dual near-infrared(NIR)-response AgInS_(2)and CuInS_(2)co-sensitized ZnO photoelectrode array consisting of two spatial-resolved paper working electrodes(PWE1and PWE2)was established to enable paper-based ratiometric photoelec trochemical(PEC)aptasensing of Di(2-ethylhexyl)phthalate(DEHP)based on triple-helix molecular switch(THMS)-mediated"on-off"switching of co-sensitization effect.Profiting from the cosensitization of AgInS_(2)and CuInS_(2)on paper-based ZnO,the dual NIR-response cascade sensitization structure of AgInS_(2)/CuInS_(2)/ZnO exhibited a wide light response range and high charge separation efficiency,giving a"switch on"state of co-sensitization effect with markedly high photocurrent response.The"switch off"state of the co-sensitization effect was made by RecJf exonuclease-assisted target recycling-induced conformation change of THMS,which caused the detachment of AgInS_(2)quantum dots from the aptasensing interface,leading to a significantly decreased photocurrent signal.Accordingly,the constant I_(1)of PWE_(1)and varying I_(2)of PWE_(2)were collected based on the incubation of constant concentration of DEHP on PWE1and various concentrations of DEHP on PWE_(2).The ultrasensitive detection of DEHP was realized by calculating the ratio of I_(2)/I_(1).This work brought new insights into the establishment of a high-performance paper-based ratiometric PEC aptasensing platform for highly sensitive quantification of DEHP.展开更多
Corn stover,an agricultural waste,was used to prepare nitrogen self-doped carbon quantum dots(CQDs)through a simple hydrothermal method with only water at near room temperature for the first time.The surface,electroch...Corn stover,an agricultural waste,was used to prepare nitrogen self-doped carbon quantum dots(CQDs)through a simple hydrothermal method with only water at near room temperature for the first time.The surface,electrochemical,and photovoltaic characteristics of CQDs doped TiO_(2)in dye-sensitized solar cells(DSSCs)were thoroughly and systematically examined.The average diameter of blue-fluorescence CQDs measured by a high-resolution transmission electron microscope(HR-TEM)was 4.63±0.87 nm,which consisted of polar functional groups.The highest occupied molecular orbital(HOMO)and lowest unoccupied molecular orbital(LUMO)energy of the biomass-derived CQDs,determined by the cyclic voltammetry(CV)test,were,−5.48 eV and−3.89 eV,respectively.The negative shift of flat band potential(Vfb)in CQDs incorporated photoanode implies the fermi level shifted upward.Experimental results revealed that the improved performance of DSSCs was due to charge transport enhancement and separation,which resulted in the improved energy level configuration between TiO_(2),CQDs,and electrolytes.In this regard,the CQDs serve as a mediator that enables charge carrier transport without hindrance.In this study,CQDs added to TiO_(2)+N719,increased short circuit current density(JSC)and power conversion efficiency(PCE)value by∼26.00%(10.13 to 12.69 mA/cm^(2))and 27.20%(4.78%to 6.08%),respectively.展开更多
Dye-sensitized solar cells（DSSCs） have attracted significant attention as alternatives to conventional silicon-based solar cells owing to their low-cost production,facile fabrication,excellent stability and high pow...Dye-sensitized solar cells（DSSCs） have attracted significant attention as alternatives to conventional silicon-based solar cells owing to their low-cost production,facile fabrication,excellent stability and high power conversion efficiency（PCE）.The dye molecule is one of the key components in DSSCs since it significant influence on the PCE,charge separation,light-harvesting,as well as the device stability.Among various dyes,easily tunable phenothiazine-based dyes hold a large proportion and achieve impressive photovoltaic performances.This class of dyes not only has superiorly non-planar butterfly structure but also possesses excellent electron donating ability and large π conjugated system.This review summarized recent developments in the phenothiazine dyes,including small molecule phenothiazine dyes,polymer phenothiazine dyes and phenothiazine dyes for co-sensitization,especially focused on the developments and design concepts of small molecule phenothiazine dyes,as well as the correlation between molecular structures and the photovoltaic performances.展开更多
A pyridine-anchor co-adsorbent of N,N＇-bis（（pyridin-2-yl）（methyl） methylene）-o-phenylenediamine（named BPPI） is prepared and employed as co-adsorbent in dye-sensitized solar cells（DSSCs）. The prepared co-ads...A pyridine-anchor co-adsorbent of N,N＇-bis（（pyridin-2-yl）（methyl） methylene）-o-phenylenediamine（named BPPI） is prepared and employed as co-adsorbent in dye-sensitized solar cells（DSSCs）. The prepared co-adsorbent could overcome the deficiency of N719 absorption in the low wavelength region of visible spectrum, offset competitive visible light absorption of I_3^-, enhance the spectral responses of the co-adsorbed TiO_2 film in region from 300 nm to 750 nm, suppress charge recombination, prolong electron lifetime, and decrease the total resistance of DSSCs. The optimized cell device co-sensitized by BPPI/N719 dye gives a short circuit current density of 12.98 m A cm^（-2）, an open circuit voltage of 0.73 V,and a fill factor of 0.66 corresponding to an overall conversion efficiency of 6.22% under standard global AM 1.5 solar irradiation, which is much higher than that of device solely sensitized by N719（5.29%）under the same conditions. Mechanistic investigations are carried out by various spectral and electrochemical characterizations.展开更多
Using a rigid azo ligand 4-[（8-hydroxy-5-quinolinyl）azo]-benzoic acid（H2 L）,a new supramolecular compound [Zn（L）（H2O）2]n（1） has been solvothermally synthesized and structurally characterized by X-ray single-...Using a rigid azo ligand 4-[（8-hydroxy-5-quinolinyl）azo]-benzoic acid（H2 L）,a new supramolecular compound [Zn（L）（H2O）2]n（1） has been solvothermally synthesized and structurally characterized by X-ray single-crystal diffraction,infrared spectrum,elemental analysis,power X-ray diffraction and thermal analysis.Compound 1 crystallizes in monoclinic,space group C2/c with a = 30.372（8）,b = 11.415（3）,c = 9.248（3） A,β = 106.94（3）o,V = 3067.20（15）A3,C（16）H（13）N3O5Zn,Mr = 392.66,Z = 8,Dc = 1.701 Mg/m^3; F（000） = 1600,μ = 1.636 mm^-1,reflections collected：7290,reflections unique：2735,R（int）= 0.0282,R = 0.0351,wR（all data） = 0.0919,GOOF on F^2 = 1.036.Compound 1 exhibits a one-dimensional（1 D） zig-zag chain structure connected into a three-dimensional（3D） supramolecular network through hydrogen bonding interactions.Fluorescent property and electrochemical property were detected on compound 1.展开更多
基金Research was supported by the Changjiang Scholars and Innovative Research Team in University(No.IRT1070)the Natural Science Foundation of China(No.51373092)+2 种基金the Specialized Research Fund for the Doc-toral Program of Higher Education of China(No.20130202120010)the Key Science and Technology Program of Shaanxi Province,China(No.2012K08-09)the State Education Ministry and the Fundamental Re-search Funds for the Central Universities(Nos.GK201302036,GK201302037).Our special thanks are also for the Fund of New Energy Devices and Materials provided by Mr.He Chong Ben,Hong Kong.
文摘Approach to highly efficient dye-sensitized solar cells(DSSCs)by co-sensitization of organic dyes,AZ6+AZ5 with co-adsorbent chenodeoxycholic acid(CDCA)is presented.The power conversion efficiencies(PCEs)of 8.55%and 8.31%are obtained from DSSCs co-sensitized by AZ6(0.3 mmol/L)+AZ5(0.1 mmol/L)with CDCA concentration of 5 and 20 mmol/L in one step cocktail,respectively.The latter shows high stability in a period of 653 h under ambient conditions.
基金Department of Textile Engineering, Chemistry and Science at North Carolina State University for the financial support
文摘Herein, we report the design and synthesis of three new D-A type metal-free carbazole based dyes（S1-3）as effective co-sensitizers for dye-sensitized solar cell（DSSC） sensitized with Ru（Ⅱ） complex（NCSU-10）.In this new design, the electron rich carbazole unit was attached to three different electron withdrawing/anchoring species, viz. 4-amino benzoic acid, sulfanilic acid and barbituric acid. The dyes were characterized by spectral, photophysical and electrochemical analysis. Their optical and electrochemical parameters along with molecular geometries, optimized from DFT have been employed to apprehend the effect of the structures of these co-sensitizers on the photovoltaic performances. Further, S1-3 dyes were co-sensitized along with a well-known NCSU-10 dye in order to broaden the spectral response of the co-sensitized devices and hence improve the efficiency. The photovoltaic performance studies indicated that, the device fabricated using S1 dye as co-sensitizer with 0.2 mM of NCSU-10 exhibited improved PCE of 9.55% with JSC of 22.85 mA cm-2, VOC of 0.672 V and FF of 62.2%, whereas the DSSC fabricated with dye NCSU-10（0.2 mM） alone displayed PCE of 8.25% with JSC of 20.41 mA cm-2, VOC of 0.667 V and FF of 60.6%. Furthermore, electronic excitations simulated using time-dependent DFT, were in good agreement with the experimentally obtained results of the co-sensitizers, indicating that the exchange-correlation function and basis set utilized for predicting the spectra of the co-sensitizers are quite appropriate for the calculations. In conclusion, the results showed the potential of simple organic co-sensitizers in the development of efficient DSSCs.
基金financially supported by the National Natural Science Foundation of China(No.22306070)Shandong Provincial Natural Science Foundation(No.ZR2023QB002)+5 种基金the Science and Technology Program of University of Jinan(No.XKY2203)the National Undergraduate Innovation and Entrepreneurship Training Program(Nos.202210427008 and 202210427005)the Postdoctoral Science Foundation of University of Jinan(No.XBH2208)Taishan Scholars Program(No.tsqn202103082)the Excellent Youth Innovation Team in Universities of Shandong(No.2021KJ021)China Postdoctoral Science Foundation(No.2023M731302)。
文摘Herein,a dual near-infrared(NIR)-response AgInS_(2)and CuInS_(2)co-sensitized ZnO photoelectrode array consisting of two spatial-resolved paper working electrodes(PWE1and PWE2)was established to enable paper-based ratiometric photoelec trochemical(PEC)aptasensing of Di(2-ethylhexyl)phthalate(DEHP)based on triple-helix molecular switch(THMS)-mediated"on-off"switching of co-sensitization effect.Profiting from the cosensitization of AgInS_(2)and CuInS_(2)on paper-based ZnO,the dual NIR-response cascade sensitization structure of AgInS_(2)/CuInS_(2)/ZnO exhibited a wide light response range and high charge separation efficiency,giving a"switch on"state of co-sensitization effect with markedly high photocurrent response.The"switch off"state of the co-sensitization effect was made by RecJf exonuclease-assisted target recycling-induced conformation change of THMS,which caused the detachment of AgInS_(2)quantum dots from the aptasensing interface,leading to a significantly decreased photocurrent signal.Accordingly,the constant I_(1)of PWE_(1)and varying I_(2)of PWE_(2)were collected based on the incubation of constant concentration of DEHP on PWE1and various concentrations of DEHP on PWE_(2).The ultrasensitive detection of DEHP was realized by calculating the ratio of I_(2)/I_(1).This work brought new insights into the establishment of a high-performance paper-based ratiometric PEC aptasensing platform for highly sensitive quantification of DEHP.
基金the Department of Energy(DOE,Award Number:DE-FE0031997)for providing funds to support our research.
文摘Corn stover,an agricultural waste,was used to prepare nitrogen self-doped carbon quantum dots(CQDs)through a simple hydrothermal method with only water at near room temperature for the first time.The surface,electrochemical,and photovoltaic characteristics of CQDs doped TiO_(2)in dye-sensitized solar cells(DSSCs)were thoroughly and systematically examined.The average diameter of blue-fluorescence CQDs measured by a high-resolution transmission electron microscope(HR-TEM)was 4.63±0.87 nm,which consisted of polar functional groups.The highest occupied molecular orbital(HOMO)and lowest unoccupied molecular orbital(LUMO)energy of the biomass-derived CQDs,determined by the cyclic voltammetry(CV)test,were,−5.48 eV and−3.89 eV,respectively.The negative shift of flat band potential(Vfb)in CQDs incorporated photoanode implies the fermi level shifted upward.Experimental results revealed that the improved performance of DSSCs was due to charge transport enhancement and separation,which resulted in the improved energy level configuration between TiO_(2),CQDs,and electrolytes.In this regard,the CQDs serve as a mediator that enables charge carrier transport without hindrance.In this study,CQDs added to TiO_(2)+N719,increased short circuit current density(JSC)and power conversion efficiency(PCE)value by∼26.00%(10.13 to 12.69 mA/cm^(2))and 27.20%(4.78%to 6.08%),respectively.
基金the National Natural Science Foundation of China(Nos.21572030,21272033,21402023)Fundamental Research Funds for the Central Universities(No.ZYGX2014J026)for financial support
文摘Dye-sensitized solar cells（DSSCs） have attracted significant attention as alternatives to conventional silicon-based solar cells owing to their low-cost production,facile fabrication,excellent stability and high power conversion efficiency（PCE）.The dye molecule is one of the key components in DSSCs since it significant influence on the PCE,charge separation,light-harvesting,as well as the device stability.Among various dyes,easily tunable phenothiazine-based dyes hold a large proportion and achieve impressive photovoltaic performances.This class of dyes not only has superiorly non-planar butterfly structure but also possesses excellent electron donating ability and large π conjugated system.This review summarized recent developments in the phenothiazine dyes,including small molecule phenothiazine dyes,polymer phenothiazine dyes and phenothiazine dyes for co-sensitization,especially focused on the developments and design concepts of small molecule phenothiazine dyes,as well as the correlation between molecular structures and the photovoltaic performances.
基金supported by National Natural Science Foundation of China (Nos. 21171044 and 21371040)the National Key Basic Research Program of China (973 Program, No. 2013CB632900)+1 种基金the Fundamental Research Funds for the Central Universities (No. HIT. IBRSEM. A201409)Program for Innovation Research of Science in Harbin Institute of Technology (PIRS of HIT Nos. A201418, A201416 and B201414)
文摘A pyridine-anchor co-adsorbent of N,N＇-bis（（pyridin-2-yl）（methyl） methylene）-o-phenylenediamine（named BPPI） is prepared and employed as co-adsorbent in dye-sensitized solar cells（DSSCs）. The prepared co-adsorbent could overcome the deficiency of N719 absorption in the low wavelength region of visible spectrum, offset competitive visible light absorption of I_3^-, enhance the spectral responses of the co-adsorbed TiO_2 film in region from 300 nm to 750 nm, suppress charge recombination, prolong electron lifetime, and decrease the total resistance of DSSCs. The optimized cell device co-sensitized by BPPI/N719 dye gives a short circuit current density of 12.98 m A cm^（-2）, an open circuit voltage of 0.73 V,and a fill factor of 0.66 corresponding to an overall conversion efficiency of 6.22% under standard global AM 1.5 solar irradiation, which is much higher than that of device solely sensitized by N719（5.29%）under the same conditions. Mechanistic investigations are carried out by various spectral and electrochemical characterizations.
基金Supported by the National Science Foundation of China(No.20831002 and 21531003)Project of Science and Technology Development of Jilin City(No.20166024)
文摘Using a rigid azo ligand 4-[（8-hydroxy-5-quinolinyl）azo]-benzoic acid（H2 L）,a new supramolecular compound [Zn（L）（H2O）2]n（1） has been solvothermally synthesized and structurally characterized by X-ray single-crystal diffraction,infrared spectrum,elemental analysis,power X-ray diffraction and thermal analysis.Compound 1 crystallizes in monoclinic,space group C2/c with a = 30.372（8）,b = 11.415（3）,c = 9.248（3） A,β = 106.94（3）o,V = 3067.20（15）A3,C（16）H（13）N3O5Zn,Mr = 392.66,Z = 8,Dc = 1.701 Mg/m^3; F（000） = 1600,μ = 1.636 mm^-1,reflections collected：7290,reflections unique：2735,R（int）= 0.0282,R = 0.0351,wR（all data） = 0.0919,GOOF on F^2 = 1.036.Compound 1 exhibits a one-dimensional（1 D） zig-zag chain structure connected into a three-dimensional（3D） supramolecular network through hydrogen bonding interactions.Fluorescent property and electrochemical property were detected on compound 1.
