Issue 34, 2014

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
01 Apr 2014
Accepted
25 May 2014
First published
28 May 2014

J. Mater. Chem. C, 2014,2, 7086-7095

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

C. Siu, L. T. Lin Lee, P. Ho, P. Majumdar, C. Ho, T. Chen, J. Zhao, H. Li and W. Wong, J. Mater. Chem. C, 2014, 2, 7086 DOI: 10.1039/C4TC00661E

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