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

Chi Ho Siu; Lawrence Tien Lin Lee; Po Yu Ho; Poulomi Majumdar; Cheuk Lam HO; Tao Chen; Jianzhang Zhao; Hua Li; Wai Yeung WONG

doi:10.1039/c4tc00661e

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

Chi Ho Siu, Lawrence Tien Lin Lee, Po Yu Ho, Poulomi Majumdar, Cheuk Lam HO^*, Tao Chen, Jianzhang Zhao, Hua Li, Wai Yeung WONG

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

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 (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 (τ_n) and high resistance to the recombination of electrons (R_rec) of 422.38 Ω.

Original language	English
Pages (from-to)	7086-7095
Number of pages	10
Journal	Journal of Materials Chemistry C
Volume	2
Issue number	34
DOIs	https://doi.org/10.1039/c4tc00661e
Publication status	Published - 14 Sept 2014

Scopus Subject Areas

Chemistry(all)
Materials Chemistry

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title = "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.",

author = "Siu, {Chi Ho} and {Lin Lee}, {Lawrence Tien} and Ho, {Po Yu} and Poulomi Majumdar and HO, {Cheuk Lam} and Tao Chen and Jianzhang Zhao and Hua Li and WONG, {Wai Yeung}",

year = "2014",

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doi = "10.1039/c4tc00661e",

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T1 - Fluorene-bridged organic dyes with di-anchoring groups for efficient co-adsorbent-free dye-sensitized solar cells

AU - Siu, Chi Ho

AU - Lin Lee, Lawrence Tien

AU - Ho, Po Yu

AU - Majumdar, Poulomi

AU - HO, Cheuk Lam

AU - Chen, Tao

AU - Zhao, Jianzhang

AU - Li, Hua

AU - WONG, Wai Yeung

PY - 2014/9/14

Y1 - 2014/9/14

N2 - 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.

AB - 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.

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DO - 10.1039/c4tc00661e

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JF - Journal of Materials Chemistry C

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ER -

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

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