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Magnesia nanoparticles in liquid electrolyte for dye sensitized solar cells: An effective recombination suppressant?

DSpace at IIT Bombay

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Title Magnesia nanoparticles in liquid electrolyte for dye sensitized solar cells: An effective recombination suppressant?
 
Creator MOHANTY, SP
BHARGAVA, P
 
Subject Dye sensitized solar cells
Magnesia
4-tert-butylpyridine
Recombination
Adsorption
LIFETIME
 
Description Recombination reactions at the photoanode/electrolyte interface reduce the photovoltaic conversion efficiency of dye sensitized solar cells (DSSCs). Unlike modification of titania photoanode by coating with MgO which act as a barrier layer toward recombination, addition of MgO nanopowder to electrolyte prevents recombination through adsorption of anions (triiodide/iodide) from electrolyte. In the present study, the surface charge of MgO has been utilized to adsorb anions from electrolyte. This anionic adsorption onto the MgO nanopowders in electrolyte has been confirmed by zeta potential measurements. MgO retards the recombination reaction as efficiently as 4-tert-butylpyridine (TBP) which is the most widely used additive in the electrolyte. Higher photocurrent and conversion efficiency is achieved by using MgO loaded electrolyte as compared to TBP added electrolyte. Dark current measurements show that recombination reactions are effectively retarded by use of MgO loaded electrolytes. Open circuit voltage decay measurements also confirm higher electron lifetime at the titania/electrolyte interface in MgO loaded electrolyte based cell as compared to additive free electrolyte based cell. (C) 2012 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-15T15:27:55Z
2014-10-15T15:27:55Z
2013
 
Type Article
 
Identifier ELECTROCHIMICA ACTA, 90291-294
http://dx.doi.org/10.1016/j.electacta.2012.11.133
http://dspace.library.iitb.ac.in/jspui/handle/100/15152
 
Language en