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New cyclic and acyclic imidazole-based sensitizers for achieving highly efficient photoanodes for dye-sensitized solar cells by potential assisted method
摘要： A series of systematically tailored aryl acyclic (biphenyl, dye 1 and 2) and cyclic (phenanthrene, dye 3 and 4) and methyl-substituted (dye 5) imidazole derivatives were synthesized and characterized for dye-sensitized solar cells (DSSCs) application. Anisole ancillary donor was attached to -NH position in the imidazole center to obtain dye 2 and 4. Cyclic voltammetry and UV-visible studies of all the dyes indicate their suitability for DSSC application. Among the synthesized dyes, dye 4 having phenanthrene donor and anisole ancillary donor showed highest power conversion efficiency (PCE) of 7.16% (JSC = 13.07 mA/cm2, VOC = 0.831 V, FF = 0.659). Dye 2 displayed the highest electron lifetime in the conduction band of photoanode and hence the open circuit voltage of DSSC based on dye 2 was highest among the dyes studied (0.865 V). By using a novel potential assisted dye staining process, the dye loading on the photoanode is enhanced by 18% in 1h, which in turn enhanced the PCE to 8.10%.
关键词： DSSC,J-V characteristics,Imidazole,Phenanthrene,IPCE,Biphenyl
更新于2025-09-23 15:21:01
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Microwave activated synthesis of Ag2S and Ag2S@ZnS nanocrystals and their application in well-performing quantum dot sensitized solar cells
摘要： Incident photon-to-current conversion e?ciency (IPCE) of CdS based quantum dot sensitized solar cells (QDSCs) is a major drawback in their low e?ciency. Here we report a new trend in fabrication of QDSC with enhanced IPCE with application of as prepared Ag2S and Ag2S@ZnS QDs as a co sensitizer. Ag2S and Ag2S@ZnS QDs were synthesized ?rst using a microwave method and were examined by means of XRD, TEM and UV–Vis spectroscopy. Then the prepared QDs were applied for the fabrication of QDSCs using a novel drop casting method. The results revealed a signi?cant enhancement of IPCE as well as short current density (12.5 mA·cm?2) and cell e?ciency (3%). The enhancement is directly related to well absorption of Ag2S with low band gap in the visible range and e?ective injection of photo-excited electrons to CdS compact layer according to suggested band diagram. Ag2S@ZnS co-sensitizer showed an enhancement in photocurrent density due to successful passivation of Ag2S QDs and suppressing recombination on their surface.
关键词： Ag2S@ZnS quantum dots,QD sensitized solar cells,IPCE,Drop casting
更新于2025-09-23 15:19:57
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Electrochemical and photoelectrochemical water oxidation of solvothermally synthesized Zr-doped α-Fe2O3 nanostructures
摘要： To investigate the oxygen evolution reaction of overall water-splitting process, Zr-doped α-Fe2O3 nanostructures were synthesized by employing one-pot solvothermal route. This work reported the electrochemical and photoelectrochemical (PEC) properties of synthesized photoanodes depending on solvothermal treatment time (i.e., 12, 16, and 20 h) maintained during synthesis. The treatment time influenced the morphology of Zr-doped α-Fe2O3 nanostructures, which directly exert an effect on the electrochemical and PEC performance of the synthesized photoanodes. The high conductivity and lowest Tafel slope value (83 mV/decade) were attained from electrochemical studies for the nanoflake morphology. The highest photocurrent of about 0.52 mA/cm2 at 1.5 V Vs RHE was obtained for Zr-doped α-Fe2O3 nanoflakes and 16.17% intrinsic photon conversion efficiency was achieved for the same sample with high photostability for 2 h under continuous irradiation of light. We reported the treatment time-dependent morphology effect on both electrochemical and PEC water oxidation of Zr-doped hematite nanoflakes in this work.
关键词： IPCE,Zr-doped hematite,Nanostructures,Water oxidation
更新于2025-09-04 15:30:14
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Ag?Au‐Bimetal Incorporated ZnO‐Nanorods Photo‐Anodes for Efficient Photoelectrochemical Splitting of Water
摘要： Plasmonic Ag(cid:0) Au/ZnO nanorods (ZNRs) based photo-anodes were synthesized using a simple electrochemical route and were then evaluated for photoelectrochemical (PEC) activity. The amalgamation of Ag and Au nanoclusters broadens the UV-Vis light absorption in the range of 400 nm to 650 nm. Ag(cid:0) Au/ZNRs photo-anodes had shown photo-current density of ~ 1.4 mA cm(cid:0) 2, at a bias of 0.75 V/SCE, which is ~ 3.1 times of bare ZNRs photo-anode. Bi-metallic Ag(cid:0) Au/ZNRs based photo-anode shows the maximum photo-conversion efficiency of 0.77 % at 0.5 V/SCE, under one sun illumination. Formation of hot electrons in Ag(cid:0) Au/ ZNRs photo-anodes can be partly held responsible for the enhanced PEC activity. Au/Ag core/shell morphology evolves when a thin layer of Ag is loaded on Au nanoparticles. For an in-depth analysis on Ag(cid:0) Au incorporated ZNRs based photo-anodes and its PEC activity, a detailed characterization was carried out using physico-chemical, spectral and microscopy techniques. The analysis shows that Au in direct contact with ZnO interacts mainly with oxygen vacancies present on surface of ZnO and Ag interacts with Au for an effective electron-hole segregation process at interface and electron storage occurs in metal nanoparticles. The results suggest bi-metal incorporated ZNRs based photo-anodes can be a prospective candidate for PEC water splitting application.
关键词： Water splitting,Incident photon to current conversion efficiency (IPCE),Bi-metal photo-anodes,Electrodeposition,PEC activity
更新于2025-09-04 15:30:14