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Interface Engineered Open-Circuit Voltage and Short-Circuit Current Density in Quantum Dots Sensitized Solar Cells via Benzoic Acid Derivatives

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Self-assembling dipole molecules of benzoic acid derivatives of 4-methoxybenzoic acid (MBA), 4-tertbutylbenzoic acid (BBA) and 4-fluorobenzoic acid (FBA) were employed to do the interfacial modification for CdS quantum dots sensitized solar cells and their impacts on photovoltaic performance were evaluated in this study. The higher open-circuit voltage and short-circuit current density led to higher photovoltaic performance of CdS/MBA/ZnO quantum-dot-sensitized solar cells (QDSSCs). Results from this study revealed that the photovoltaic performances of solar cells were strongly dependent on dipole moment of molecules. The ultraviolet photoemission spectroscopy results indicated that the use of self-assembling dipole molecule with negative dipole could increase the open-circuit voltage, which was attributed primarily to enhanced interfacial charge transfer rate at the anode due to decreased interfacial energy step between the work function of ZnO photo anodes and valance band of CdS quantum dots. The detailed analysis for External Quantum Efficiency (EQE) results revealed that the charge collection efficiency may play critical role in determining the EQE and short-circuit current density of QDSSCs.
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Keywords: CHARGE COLLECTION EFFICIENCY; CHARGE TRANSFER EFFICIENCY; SELF-ASSEMBLING DIPOLE MOLECULES; WORK FUNCTION

Document Type: Short Communication

Publication date: September 1, 2017

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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