Current density enhancement in ZnO/CdSe photoelectrochemical cells in the presence of a charge separating SnO2 nanoparticles interfacing-layer

Title
Current density enhancement in ZnO/CdSe photoelectrochemical cells in the presence of a charge separating SnO2 nanoparticles interfacing-layer
Other Titles
CdSe photoelectrochemical cells in the presence of a charge separating SnO2 nanoparticles interfacing-layer
Author
한성환
Keywords
SENSITIZED SOLAR-CELLS; QUANTUM DOTS; ENERGY CONVERSION; ELECTRON-TRANSFER; CDSE; NANOCRYSTALS
Issue Date
2013-06
Publisher
ROYAL SOC CHEMISTRY
Citation
DALTON TRANSACTIONS, 2013, 42(36), p13065-p13070
Abstract
Photoelectrochemical cells (PECs) of ZnO/CdSe decorated with a charge separating SnO2 nanoparticles (NPs) layer of various thicknesses are prepared and characterized by using scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), UV-visible absorption, energy dispersive X-ray analysis spectroscopy (EDX) and incident photon-to-current conversion efficiency (IPCE) measurements. A uniform coverage of the SnO2 NPs layer over ZnO/CdSe electrode surface is evidenced. The EDX elemental mapping analysis of the ZnO/CdSe/SnO2 PECs demonstrates the presence of Sn and O over the surface. A remarkable improvement in the light harvesting efficiency confirmed from the IPCE measurement, supports an enhancement in current density in the current density-voltage measurement due to increased electron transport and smaller charge recombination. Moreover, these observations are corroborated with the EIS measurement as a cell with SnO2 reveals a reduced charge transfer resistance due to which the power conversion efficiency is increased from 2.20 to 3.41% i.e. 55% compared to the pristine ZnO/CdSe PEC.
URI
http://pubs.rsc.org/en/content/articlelanding/2013/dt/c3dt51149a#!divAbstracthttp://hdl.handle.net/20.500.11754/46508
ISSN
1477-9226
DOI
10.1039/C3DT51149A
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > CHEMISTRY(화학과) > Articles
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