Blue Copper Model Complexes with Distorted Tetragonal Geometry Acting as Effective Electron-Transfer Mediators in Dye-Sensitized Solar Cells

Hattori, Shinichi; Wada, Yuji; Yanagida, Shozo; Fukuzumi, Shunichi

doi:10.1021/ja0506814

Cited by 304 publications

(253 citation statements)

References 63 publications

Supporting

Mentioning

248

Contrasting

Order By: Relevance

“…First, Hattori et al obtained a maximum photon to current efficiency (PCE) of 1.4% with bis(2,9-dimethyl-1,10-phenantroline)copper(I)/(II) [Cu(dmp) 2 ] 2+/+1 , which has a distorted tetragonal shape providing a relatively low reorganization energy. 19 The results were further improved by Bai et al, who reached 7% PCE 18 with the organic C218 dye, and recently, Freitag et al attained 8.3% PCE by having remarkably high open-circuit voltages (V oc ) above 1.0 V with the organic D−π−A LEG4 dye. 23 Furthermore, it was reported that the [Cu(dmp) 2 ] 2+/1+ complex with a redox potential of 0.93 V vs SHE is able to sufficiently regenerate the oxidized dye molecules with a small driving force (0.2 eV), minimizing internal energy losses.…”

Section: ■ Introductionmentioning

confidence: 94%

Copper Bipyridyl Redox Mediators for Dye-Sensitized Solar Cells with High Photovoltage

Saygılı¹,

Söderberg²,

Pellet³

et al. 2016

J. Am. Chem. Soc.

258

365

View full text Add to dashboard Cite

Redox mediators play a major role determining the photocurrent and the photovoltage in dye-sensitized solar cells (DSCs). To maintain the photocurrent, the reduction of oxidized dye by the redox mediator should be significantly faster than the electron back transfer between TiO 2 and the oxidized dye. The driving force for dye regeneration with the redox mediator should be sufficiently low to provide high photovoltages. With the introduction of our new copper complexes as promising redox mediators in DSCs both criteria are satisfied to enhance power conversion efficiencies. In this study, two copper bipyridyl complexes, Cu (II/I) (dmby) 2 TFSI 2/1 (0.97 V vs SHE, dmby = 6,6′-dimethyl-2,2′-bipyridine) and Cu (II/I) (tmby) 2 TFSI 2/1 (0.87 V vs SHE, tmby = 4,4′,6,6′-tetramethyl-2,2′-bipyridine), are presented as new redox couples for DSCs. They are compared to previously reported Cu (II/I) (dmp) 2 TFSI 2/1 (0.93 V vs SHE, dmp = bis(2,9-dimethyl-1,10-phenanthroline). Due to the small reorganization energy between Cu(I) and Cu(II) species, these copper complexes can sufficiently regenerate the oxidized dye molecules with close to unity yield at driving force potentials as low as 0.1 V. The high photovoltages of over 1.0 V were achieved by the series of copper complex based redox mediators without compromising photocurrent densities. Despite the small driving forces for dye regeneration, fast and efficient dye regeneration (2−3 μs) was observed for both complexes. As another advantage, the electron back transfer (recombination) rates were slower with Cu (II/I) (tmby) 2 TFSI 2/1 as evidenced by longer lifetimes. The solar-toelectrical power conversion efficiencies for [Cu(tmby) 2+/1+ based electrolytes were 10.3%, 10.0%, and 10.3%, respectively, using the organic Y123 dye under 1000 W m −2 AM1.5G illumination. The high photovoltaic performance of Cu-based redox mediators underlines the significant potential of the new redox mediators and points to a new research and development direction for DSCs.

show abstract

Section: ■ Introductionmentioning

confidence: 94%

Copper Bipyridyl Redox Mediators for Dye-Sensitized Solar Cells with High Photovoltage

Saygılı¹,

Söderberg²,

Pellet³

et al. 2016

J. Am. Chem. Soc.

258

365

View full text Add to dashboard Cite

show abstract

“…However, the I 3 − /I − redox electrolyte has several critical disadvantages such as the corrosion of copper/silver lines, visible light absorption and the complicated redox chemistry to cause great energy loss. [9][10][11] To overcome these limitations, new redox couples including TEMPO/TEM-PO ＋ , [12] TMTU/TMFDS 2 ＋ , [13] thiolate/disulfide, [14] ferrocene(0/ ＋ ), [15] copper(I/II), [16][17][18] and cobalt-(II/III) [19][20][21][22][23][24] were explored. Recently, major progress has been achieved through the development of DSSCs based on electrolyte containing cobalt(II/III) redox couple, which afford record efficency of up to 12.3%.…”

Section: /Imentioning

confidence: 99%

High‐Performance Cobalt Selenide and Nickel Selenide Nanocomposite Counter Electrode for Both Iodide/Triiodide and Cobalt(II/III) Redox Couples in Dye‐Sensitized Solar Cells

Wang

Zhang

et al. 2014

Chin. J. Chem.

View full text Add to dashboard Cite

The nanocomposites of cobalt selenide and nickel selenide (Co 0.85 Se/Ni 0.85 Se) were successfully fabricated on FTO glass by a facile co-electrodeposition method at ambient temperature. Nanocomposite films were used as electrocatalysts in dye-sensitized solar cell counter electrodes for regeneration of both iodide/triiodide and cobalt(II/III) redox couples. Co 0.85 Se/Ni 0.85 Se were mainly composed of nanoflakes and nanoparticles. It is noted that such nanostructure generated by nanoparticles embedded with 2D nanoflakes led to high active sites and was accessible to cobalt(II/III) electrolyte, delivering better catalytic activity for the reduction of larger volume cobalt(II/III). As a result, for cobalt(II/III) electrolyte, the Co 0.85 Se/Ni 0.85 Se based dye-sensitized solar cell performed significantly improved efficiency than that of Pt and Co 0.85 Se. Meanwhile, the Co 0.85 Se/Ni 0.85 Se based dye-sensitized solar cell held comparable energy conversion efficiency to that of Pt and Co 0.85 Se for iodide/triiodide electrolyte.

show abstract

“…However, in 2005, Fukuzumi and co-workers reported that copper complexes worked well as redox mediators at reduced light intensities (∼20 mW cm -2 ) (ref. 24). The bis(2,9-dimethyl-1,10-phenanthroline) copper-based DSCs were further improved by Wang and co-workers by combining them with an organic sensitizer, which led to an increase in the power conversion efficiencies (PCEs) from 7.0% at 100 mW cm -2 to 8.3% at ∼23 mW cm -2 air mass 1.5 global (AM 1.5G) light 25 .…”

mentioning

confidence: 99%

Dye-sensitized solar cells for efficient power generation under ambient lighting

et al. 2017

View full text Add to dashboard Cite

Blue Copper Model Complexes with Distorted Tetragonal Geometry Acting as Effective Electron-Transfer Mediators in Dye-Sensitized Solar Cells

Cited by 304 publications

References 63 publications

Copper Bipyridyl Redox Mediators for Dye-Sensitized Solar Cells with High Photovoltage

Copper Bipyridyl Redox Mediators for Dye-Sensitized Solar Cells with High Photovoltage

High‐Performance Cobalt Selenide and Nickel Selenide Nanocomposite Counter Electrode for Both Iodide/Triiodide and Cobalt(II/III) Redox Couples in Dye‐Sensitized Solar Cells

Dye-sensitized solar cells for efficient power generation under ambient lighting

Contact Info

Product

Resources

About