Indexed by:期刊论文

Date of Publication:2014-09-14

Journal:JOURNAL OF MATERIALS CHEMISTRY C

Included Journals:SCIE、EI、Scopus

Volume:2

Issue:34

Page Number:7086-7095

ISSN No.:2050-7526

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 (eta). 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 eta of 6.11% without the need for co-adsorbent addition. An open-circuit photovoltage (V-oc) of 0.753 V, a short-circuit photocurrent density (J(sc)) of 11.20 mA cm(2) and a fill factor (ff) of 0.725 were measured in such co-adsorbent-free cells. The high V-oc value is mainly attributed to the improved electron lifetime (tau(n)) and high resistance to the recombination of electrons (R-rec) of 422.38 Omega.