In this work, the perovskite solar cells(PSCs) were fabricated with the bandgap-tunable(FA)_x(MA)_(1-x)PbI_3 absorber layers through a facile two-stage deposition route.The doping was realized by adding the formamidin...In this work, the perovskite solar cells(PSCs) were fabricated with the bandgap-tunable(FA)_x(MA)_(1-x)PbI_3 absorber layers through a facile two-stage deposition route.The doping was realized by adding the formamidinium iodide(FAI) into a precursor MAI solution.Both the surface morphology and electrochemical impedance spectra(EIS) were conducted to evaluate the absorber layers or solar cells.After the optimization, the best PSC performance of 14.73% was achieved at a nominal FAI content of 12.5 at.%.The performance enhancement was attributed to both the enhancement of visible light harvesting and carrier transport capability.Besides, the stability of a PSC device based on the single MAPbI_3 absorber layer was also investigated, and a power conversion efficiency(PCE) of 11.27 % remained even after laying in vacuum for 10 days.展开更多
ZnO nanorod arrays(NRAs) were prepared via a facile hydrothermal method for photoelectrochemical(PEC) applications.Then, ZnS thin shell layers were deposited onto them via a facile hydrothermal treatment process for c...ZnO nanorod arrays(NRAs) were prepared via a facile hydrothermal method for photoelectrochemical(PEC) applications.Then, ZnS thin shell layers were deposited onto them via a facile hydrothermal treatment process for constructing a ZnO/ZnS core/shell structure. It was demonstrated that the PEC activity of a ZnO NRA is enhanced significantly after the surface modification, although there weren’t any obvious changes in the visible-light harvesting efficiency.Both the Nyquist and Mott-Schottky(M-S) plots were employed to reveal the reason, which was attributed to higher electrocatalytic activity of ZnS than that of ZnO and the resulting higher charge transfer efficiency across the solid/liquid interfaces. Finally, a schematic band model was proposed for clarifying the charge carrier transfer mechanism occurred at the interfaces.展开更多
Ag_(3)PO_(4) microparticles(MPs)were prepared through a facile chemical precipitation route and using silver acetate(AgAc)as metal salt.The effect of annealing temperature(T_(a))and time(τ_(a))on the actual photocata...Ag_(3)PO_(4) microparticles(MPs)were prepared through a facile chemical precipitation route and using silver acetate(AgAc)as metal salt.The effect of annealing temperature(T_(a))and time(τ_(a))on the actual photocatalytic(PC)activity of Ag_(3)PO_(4) MPs is investigated.The optimal annealing parameters are T_(a) of 400℃andτ_(a) of 90 min.The enhanced PC activity by annealing at 400℃is ascribed to the increase of electron mobility.Besides,an Ag_(3)PO_(4) photoelectrode was fabricated through a drop-coating deposition route,which demonstrates a photocurrent density of 80μA/cm^(2) and acceptable stability.The n-type conduction behavior of Ag_(3)PO_(4) is verified by a Mott-Schottky(M-S)plot.展开更多
基金supported by the Science and Technology Projects of Xuzhou City(No.KC14SM088)the Natural Science Fund for Colleges and Universities in Jiangsu Province(No.15KJB430031)
文摘In this work, the perovskite solar cells(PSCs) were fabricated with the bandgap-tunable(FA)_x(MA)_(1-x)PbI_3 absorber layers through a facile two-stage deposition route.The doping was realized by adding the formamidinium iodide(FAI) into a precursor MAI solution.Both the surface morphology and electrochemical impedance spectra(EIS) were conducted to evaluate the absorber layers or solar cells.After the optimization, the best PSC performance of 14.73% was achieved at a nominal FAI content of 12.5 at.%.The performance enhancement was attributed to both the enhancement of visible light harvesting and carrier transport capability.Besides, the stability of a PSC device based on the single MAPbI_3 absorber layer was also investigated, and a power conversion efficiency(PCE) of 11.27 % remained even after laying in vacuum for 10 days.
基金supported by the Science and Technology Projects of Xuzhou City(No.KC14SM088)the Natural Science Fund for Colleges and Universities in Jiangsu Province(No.15KJB430031)
文摘ZnO nanorod arrays(NRAs) were prepared via a facile hydrothermal method for photoelectrochemical(PEC) applications.Then, ZnS thin shell layers were deposited onto them via a facile hydrothermal treatment process for constructing a ZnO/ZnS core/shell structure. It was demonstrated that the PEC activity of a ZnO NRA is enhanced significantly after the surface modification, although there weren’t any obvious changes in the visible-light harvesting efficiency.Both the Nyquist and Mott-Schottky(M-S) plots were employed to reveal the reason, which was attributed to higher electrocatalytic activity of ZnS than that of ZnO and the resulting higher charge transfer efficiency across the solid/liquid interfaces. Finally, a schematic band model was proposed for clarifying the charge carrier transfer mechanism occurred at the interfaces.
基金supported by the Natural Science Foundation of Xuzhou City(No.KC14SM088)the Natural Science Fund for Colleges and Universities of Jiangsu Province(Nos.15KJB430031 and 16KJB310019)
文摘Ag_(3)PO_(4) microparticles(MPs)were prepared through a facile chemical precipitation route and using silver acetate(AgAc)as metal salt.The effect of annealing temperature(T_(a))and time(τ_(a))on the actual photocatalytic(PC)activity of Ag_(3)PO_(4) MPs is investigated.The optimal annealing parameters are T_(a) of 400℃andτ_(a) of 90 min.The enhanced PC activity by annealing at 400℃is ascribed to the increase of electron mobility.Besides,an Ag_(3)PO_(4) photoelectrode was fabricated through a drop-coating deposition route,which demonstrates a photocurrent density of 80μA/cm^(2) and acceptable stability.The n-type conduction behavior of Ag_(3)PO_(4) is verified by a Mott-Schottky(M-S)plot.
