The combination of a new organic D–π–A dye with different organic hole-transport materials for efficient solid-state dye-sensitized solar cells

Author(s): Peng Liu ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Bo Xu ⁶ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Karl Martin Karlsson ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Jinbao Zhang ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ ^, ¹¹ , Nick Vlachopoulos ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ ^, ¹¹ , Gerrit Boschloo ⁷ ^, ⁸ ^, ⁹ ^, ¹⁰ ^, ¹¹ , Licheng Sun ⁶ ^, ² ^, ³ ^, ⁴ ^, ⁵ , Lars Kloo ¹ ^, ² ^, ³ ^, ⁴ ^, ⁵

Publication date (Electronic): 2015

Journal: Journal of Materials Chemistry A

Publisher: Royal Society of Chemistry (RSC)

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Abstract

A new organic donor–π–acceptor sensitizer MKA253 has been applied for highly efficient solid-state dye-sensitized solar cells (ssDSSCs).

Abstract

A new organic donor–π–acceptor sensitizer MKA253 has been applied for highly efficient solid-state dye-sensitized solar cells (ssDSSCs). Using 2,2′,7,7′-tetrakis( N, N-di- p-methoxyphenyl-amine)9,9′-spirobifluorene (Spiro-OMeTAD) as the hole transport material (HTM), an excellent power conversion efficiency of 6.1% was recorded together with a high short-circuit current of 12.4 mA cm ⁻² under standard AM 1.5G illumination (100 mW cm ⁻²). Different combinations of dyes and HTMs have also been investigated in the ssDSSC device. The results showed that small molecule HTM based devices suffer from comparably high electron recombination losses, thus causing low open-circuit voltage. In addition, photo-induced absorption (PIA) spectroscopy showed that the small-molecule HTMs lead to more efficient dye regeneration in comparison with Spiro-OMeTAD, despite a lower thermodynamic driving force. The results of this study also show that optimized energy levels for the dye–HTMs could be a vital factor for highly efficient ssDSSCs.

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Dye-sensitized solar cells.

Anders Hagfeldt, Gerrit Boschloo, Licheng Sun … (2011)

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Porphyrin-sensitized solar cells with cobalt (II/III)-based redox electrolyte exceed 12 percent efficiency.

Aswani Yella, Hsuan-Wei Lee, Hoi Nok Tsao … (2011)

The iodide/triiodide redox shuttle has limited the efficiencies accessible in dye-sensitized solar cells. Here, we report mesoscopic solar cells that incorporate a Co((II/III))tris(bipyridyl)-based redox electrolyte in conjunction with a custom synthesized donor-π-bridge-acceptor zinc porphyrin dye as sensitizer (designated YD2-o-C8). The specific molecular design of YD2-o-C8 greatly retards the rate of interfacial back electron transfer from the conduction band of the nanocrystalline titanium dioxide film to the oxidized cobalt mediator, which enables attainment of strikingly high photovoltages approaching 1 volt. Because the YD2-o-C8 porphyrin harvests sunlight across the visible spectrum, large photocurrents are generated. Cosensitization of YD2-o-C8 with another organic dye further enhances the performance of the device, leading to a measured power conversion efficiency of 12.3% under simulated air mass 1.5 global sunlight.