Metal–organic-framework(MOF)has been an increasingly hot organic-inorganic hybrid compounds. Here we develop an innovative concept by engineering a supporting layer made of MOF derived carbon materials. The supportin...Metal–organic-framework(MOF)has been an increasingly hot organic-inorganic hybrid compounds. Here we develop an innovative concept by engineering a supporting layer made of MOF derived carbon materials. The supporting thin layer is prepared by carbonizing zeolitic-imidazole framework(ZIF-67). CdSe quantum dot sensitized TiO_2 nanocrystalline thin film deposited by the method of chemical bath deposition(CBD). The MOF unique microstructure in the support layer builds the electronic highway, which greatly improves the efficiency of the CdSe quantum dot-sensitized solar cells(QDSSCs), and the power conversion efficiency(PCE)of the device was significantly improved from 2.98% to 5.79% via ZIF-67 derived carbon supporting thin layer.展开更多
To find a novel counter electrode(CE)material for quantum dot-sensitized solar cells(QDSSCs),pompon-like NiCo_(2)O_(4) nanospheres are synthesized by a facile solvothermal and post-calcination method and we attempt to...To find a novel counter electrode(CE)material for quantum dot-sensitized solar cells(QDSSCs),pompon-like NiCo_(2)O_(4) nanospheres are synthesized by a facile solvothermal and post-calcination method and we attempt to apply it as a CE material for QDS SC.The catalytic performance of NiCo_(2)O_(4) counter electrode is investigated in detail through electrochemical impedance spectroscopy,Tafel test and cyclic voltammetry.The catalytic activity of NiCo_(2)O_(4) CE is superior to that of nanoflower-like Cu2S CE and traditional Cu2S/brass CE,which is mainly attributed to the large specific surface area,outstanding electrical conductivity of bimetallic oxides and the synergistic promotion effect of metals with different valence states.Under standard sunlight(air mass AM 1.5G 100 mW·cm^(-2)),the CdS/CdSe/ZnS-sensitized solar cell assembled with NiCo_(2)O_(4) CE achieved a photoelectric conversion efficiency of 5.55%,with a short current density of 22.49 mA·cm^(-2),an open circuit voltage of 0.574 V,and a fill factor of 0.43,which is slightly higher than the QDSSCs with nanoflower-like Cu_(2)S CE(4.75%)and traditional Cu_(2)S/brass CE(4.69%).This research provides ideas for discovering innovative and efficient CE materials for QDSSCs.展开更多
Developing efficient counter electrodes(CEs)and quantum dots made of earth-abundant and non-toxic elements is essential but still challenging for quantum dot-sensitized solar cells(QDSSCs).Here,we report a facile stra...Developing efficient counter electrodes(CEs)and quantum dots made of earth-abundant and non-toxic elements is essential but still challenging for quantum dot-sensitized solar cells(QDSSCs).Here,we report a facile strategy to prepare self-supported and robust CoS_2and NiS nanocrystals-assembled nanosheets directly grown on carbon paper(MS_xNS@CP)as efficient counter electrodes for QDSSCs.Such CEs integrate the merits of fast electron transfer from interconnected conductive scaffold,efficient mass transfer from hierarchically vertical nanosheet on 3D open substrate,as well as abundant highly active catalytic sites from metal sulphide nanocrystal units.As a result,QDDSCs based on such CoS_2NS@CP and NiS NS@CP CEs achieve a PCE of8.88%and 7.53%,respectively.The detailed analyses suggest that CoS_2NS@CP has the highest catalytic activity and shows the lowest charger transfer resistance,leading to the highest PCE.These findings may inspire the design and exploration of other self-supported efficient CEs by integrating highly active catalysts onto 3D conductive networks for efficient QDSSCs.展开更多
This paper proposed a new architecture design for nanowire-based quantum-dot-sensitized solar cells to improve the photovoltaic performance. Microstructured rough substrate was used to increase the surface area of the...This paper proposed a new architecture design for nanowire-based quantum-dot-sensitized solar cells to improve the photovoltaic performance. Microstructured rough substrate was used to increase the surface area of the photoanode without influence on charge carrier transport in the system. Compared to conventional devices, the short circuit current density and power conversion efficiency were enhanced by 50%. And the technology can be widely used in the photoelectroehemical （PEC） field, and it can be combined with other hierarchical nanostructures.展开更多
文摘Metal–organic-framework(MOF)has been an increasingly hot organic-inorganic hybrid compounds. Here we develop an innovative concept by engineering a supporting layer made of MOF derived carbon materials. The supporting thin layer is prepared by carbonizing zeolitic-imidazole framework(ZIF-67). CdSe quantum dot sensitized TiO_2 nanocrystalline thin film deposited by the method of chemical bath deposition(CBD). The MOF unique microstructure in the support layer builds the electronic highway, which greatly improves the efficiency of the CdSe quantum dot-sensitized solar cells(QDSSCs), and the power conversion efficiency(PCE)of the device was significantly improved from 2.98% to 5.79% via ZIF-67 derived carbon supporting thin layer.
基金financially supported by the Natural Science Foundation of China(Grant Nos.22071018 and 21671035)。
文摘To find a novel counter electrode(CE)material for quantum dot-sensitized solar cells(QDSSCs),pompon-like NiCo_(2)O_(4) nanospheres are synthesized by a facile solvothermal and post-calcination method and we attempt to apply it as a CE material for QDS SC.The catalytic performance of NiCo_(2)O_(4) counter electrode is investigated in detail through electrochemical impedance spectroscopy,Tafel test and cyclic voltammetry.The catalytic activity of NiCo_(2)O_(4) CE is superior to that of nanoflower-like Cu2S CE and traditional Cu2S/brass CE,which is mainly attributed to the large specific surface area,outstanding electrical conductivity of bimetallic oxides and the synergistic promotion effect of metals with different valence states.Under standard sunlight(air mass AM 1.5G 100 mW·cm^(-2)),the CdS/CdSe/ZnS-sensitized solar cell assembled with NiCo_(2)O_(4) CE achieved a photoelectric conversion efficiency of 5.55%,with a short current density of 22.49 mA·cm^(-2),an open circuit voltage of 0.574 V,and a fill factor of 0.43,which is slightly higher than the QDSSCs with nanoflower-like Cu_(2)S CE(4.75%)and traditional Cu_(2)S/brass CE(4.69%).This research provides ideas for discovering innovative and efficient CE materials for QDSSCs.
基金supported by the National Natural Science Foundation of China (21573249, 51732004)the Strategic Priority Research Program of the Chinese Academy of Sciences (XDB12020100)
文摘Developing efficient counter electrodes(CEs)and quantum dots made of earth-abundant and non-toxic elements is essential but still challenging for quantum dot-sensitized solar cells(QDSSCs).Here,we report a facile strategy to prepare self-supported and robust CoS_2and NiS nanocrystals-assembled nanosheets directly grown on carbon paper(MS_xNS@CP)as efficient counter electrodes for QDSSCs.Such CEs integrate the merits of fast electron transfer from interconnected conductive scaffold,efficient mass transfer from hierarchically vertical nanosheet on 3D open substrate,as well as abundant highly active catalytic sites from metal sulphide nanocrystal units.As a result,QDDSCs based on such CoS_2NS@CP and NiS NS@CP CEs achieve a PCE of8.88%and 7.53%,respectively.The detailed analyses suggest that CoS_2NS@CP has the highest catalytic activity and shows the lowest charger transfer resistance,leading to the highest PCE.These findings may inspire the design and exploration of other self-supported efficient CEs by integrating highly active catalysts onto 3D conductive networks for efficient QDSSCs.
文摘This paper proposed a new architecture design for nanowire-based quantum-dot-sensitized solar cells to improve the photovoltaic performance. Microstructured rough substrate was used to increase the surface area of the photoanode without influence on charge carrier transport in the system. Compared to conventional devices, the short circuit current density and power conversion efficiency were enhanced by 50%. And the technology can be widely used in the photoelectroehemical （PEC） field, and it can be combined with other hierarchical nanostructures.
