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Research Articles

Effect of cation size of iodide salt in the electrolyte on the performance of dye sensitised solar cells

Authors:

WVT Madhushani,

LK
About WVT

Department of Electronics, Faculty of Applied Sciences, Wayamba University of Sri Lanka, Kuliyapitiya.

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YMCD Jayathilake,

LK
About YMCD

Department of Electronics, Faculty of Applied Sciences, Wayamba University of Sri Lanka, Kuliyapitiya.

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KS Perera ,

LK
About KS

Department of Electronics, Faculty of Applied Sciences, Wayamba University of Sri Lanka, Kuliyapitiya.

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KP Vidanapathirana

LK
About KP

Department of Electronics, Faculty of Applied Sciences, Wayamba University of Sri Lanka, Kuliyapitiya.

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Abstract

Gel polymer electrolytes (GPEs) have an upsurge interest among scientists due to their fascinating advantages such as leak proof nature, long term stability and good performance. They have been extensively tested for various devices including rechargeable cells, dye sensitised solar (DSS) cells, electrochromic devices and super capacitors. When GPEs are employed for DSS cells, the salt in the electrolyte has been known to play a major role in governing the cell performance. All DSS cells that use iodide/triiodide redox couple comprise a GPE complexed with an iodide salt. Therefore it has been accepted in principle, that GPE should assist iodide ion conductivity.

In this study, GPEs based on several iodide salts were prepared and their performance in DSS cells were evaluated. As such, three different iodide salts, namely, potassium iodide (KI), zinc iodide (ZnI2) and tetrapropylammonium iodide (Pr4NI) were chosen for the study. The selection was mainly based on salts with cations having dissimilar sizes and valencies. Among them, KI based gel polymer electrolyte had the highest conductivity. However, the dye sensitised solar cell based on Pr4NI exhibited the highest performance. Gel polymer electrolyte based on ZnI2 had the lowest conductivity and also the lowest performance in DSS cells.

How to Cite: Madhushani, W. et al., (2016). Effect of cation size of iodide salt in the electrolyte on the performance of dye sensitised solar cells. Journal of the National Science Foundation of Sri Lanka. 44(1), pp.77–81. DOI: http://doi.org/10.4038/jnsfsr.v44i1.7984
Published on 31 Mar 2016.
Peer Reviewed

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