http://dx.doi.org/10.1039/C4TC00661E">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Fluorene-bridged organic dyes with di-anchoring groups for efficient co-adsorbent-free dye-sensitized solar cells

Language

English

Abstract

A series of new fluorene-bridged organic dyes with di-anchoring groups have been synthesized and well characterized. Such a molecular design strategy using two organic anchors inhibits the undesirable charge recombination and prolongs the electron lifetime which results in significant enhancement of the power conversion efficiency (η). These findings were supported by the results from electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD). Under standard AM 1.5 irradiation (100 mW cm-2), the best dye-sensitized solar cell (DSSC) exhibits a high η of 6.11% without the need for co-adsorbent addition. An open-circuit photovoltage (Voc) of 0.753 V, a short-circuit photocurrent density (Jsc) of 11.20 mA cm-2 and a fill factor (ff) of 0.725 were measured in such co-adsorbent-free cells. The high Voc value is mainly attributed to the improved electron lifetime (τn) and high resistance to the recombination of electrons (Rrec) of 422.38 Ω. © the Partner Organisations 2014.

Publication Date

2014

Source Publication Title

Journal of Materials Chemistry. C

Volume

2

Issue

34

Start Page

7086

End Page

7095

Publisher

Royal Society of Chemistry

ISSN (print)

20507526

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