144 0

Enhanced performance of PbS-sensitized solar cells via controlled successive ionic-layer adsorption and reaction

Title
Enhanced performance of PbS-sensitized solar cells via controlled successive ionic-layer adsorption and reaction
Author
방진호
Keywords
SEMICONDUCTOR QUANTUM DOTS; HIGHLY EFFICIENT; ELECTRON INJECTION; COUNTER ELECTRODE; POLYSULFIDE ELECTROLYTE; CHARGE SEPARATION; COLLOIDAL PBS; PHOTOCURRENT; DESIGN; ELECTROCATALYSTS
Issue Date
2015-04
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v. 17, NO 15, Page. 9752-9760
Abstract
Despite the potential of PbS quantum dots (QDs) as sensitizers for quantum-dot-sensitized solar cells (QDSSCs), achieving a high photocurrent density over 30 mA cm(-2) remains a challenging task in PbS-sensitized solar cells. In contrast to previous attempts, where Hg2+ -doping or multi-step post-treatment is necessary, we are capable of achieving a high photocurrent exceeding 30 mA cm(-2) simply by manipulating the successive ionic layer adsorption and reaction (SILAR) method. We show that controlling temperature at which SILAR is performed is critical to obtain a higher and more uniform coverage of PbS QDs over a mesoporous TiO2 film. The deposition of a CdS inter-layer between TiO2 and PbS is found to be an effective means of ensuring high photocurrent and stability. Not only does this modification improve the light absorption capability of the photoanode, but it also has a significant effect on charge recombination and electron injection efficiency at the PbS/TiO2 interface according to our in-depth study using electrochemical impedance spectroscopy (EIS). The implication of subtle changes in the interfacial events via modified SILAR conditions for PbS-sensitized solar cells is discussed.
URI
http://pubs.rsc.org/en/Content/ArticleLanding/2015/CP/C5CP00941C#!divAbstracthttp://hdl.handle.net/20.500.11754/23796
ISSN
1463-9076; 1463-9084
DOI
10.1039/c5cp00941c
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > BIONANOTECHNOLOGY(바이오나노학과) > Articles
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE