A novel compact DPP dye with enhanced light harvesting and charge transfer properties for highly efficient DSCs

Zhang, Fang; Jiang, Ke‐Jian; Huang, Jinhua; Yu, Chun-Chun; Li, Shaogang; Ming-gong, Chen; Yang, Lian‐Ming; Song, Yanlin

doi:10.1039/c3ta10618g

Cited by 48 publications

(19 citation statements)

References 38 publications

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“…22, 28 DPP-based molecular units have been used as π-linkers in D-A based organic dyes for Graetzel-type cells. 13,29,30 The absorption window in such dyes have been limited to 550 nm which is constrained by the length of the DPP linker. 31 Recently, Sharma et al (TDPP-BBT).…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity in Dye–TiO₂ Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

et al. 2014

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Power conversion efficiency of a solar cell is a complex parameter which usually hides the molecular details of the charge generation process. For rationally tailoring the overall device efficiency of the dye-sensitized solar cell, detailed molecular understanding of photoinduced reactions at the dye-TiO 2 interface has to be achieved. Recently, near-IR absorbing diketopyrrolopyrrole-based (DPP) low bandgap polymeric dyes with enhanced photo-stabilities has been used for TiO 2 sensitization with moderate efficiencies. To improve the reported device performances, a critical analysis of the polymer-TiO 2 interaction and electron transfer dynamics is imperative. Employing a combination of time-resolved optical measurements complemented by low temperature EPR and steady-state Raman spectroscopy on polymer-TiO 2 conjugates, we provide direct evidence for photoinduced electron injection from the TDPP-BBT polymer singlet state into TiO 2 through the C=O group of the DPP-core. A detailed excited state description of the electron transfer process in films reveals instrument response function (IRF) limited (<110 fs) charge injection from a minor polymer fraction followed by a picosecond recombination. The major fraction of photo-excited polymers however, does not show injection indicating pronounced ground state heterogeneity induced due to non-specific polymer-TiO 2 interactions.Our work therefore underscores the importance of gathering molecular-level insight into the competitive pathways of ultrafast charge generation along with probing the chemical heterogeneity at the nanoscale within the polymer-TiO 2 films for optimizing photovoltaic device efficiencies.

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Section: Introductionmentioning

confidence: 99%

Heterogeneity in Dye–TiO₂ Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

et al. 2014

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“…In addition, many other linear polyenes, particularly donor-acceptor linear polyenes because of their ability to undergo intramolecular charge transfer (ICT) in the excited state are considered useful materials in several applications such as luminescence, nonlinear optics, dye-sensitized solar cell, etc. [6][7][8][9][10]. In order to understand the exact nature of the electronically excited state properties of linear polyenes, donor-acceptor molecules based on α,ω-diphenylpolyene [Ar(CH = CH) n Ar] framework, like 1,2-diphenylethene [Ar(CH = CH)Ar, DPE, stilbene], 1,4-diphenylbutadiene [Ar(CH = CH) 2 Ar, DPB], 1,6-diphenylhexatriene [Ar(CH = CH) 3 Ar, DPH] and other longer homologues have been extensively studied as models of photobiologically significant linear polyenes like retinal, carotenoids and their lower homologues [11][12][13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 98%

“…Chemical structure of donor-acceptor substituted-DPE (4), DPB (5) and ethenylindoles(6)(7)(8)(9)(10). Compounds 4-9 fluoresce from CRICT state.…”

mentioning

confidence: 99%

Donor-Acceptor Conjugated Linear Polyenes: A Study of Excited State Intramolecular Charge Transfer, Photoisomerization and Fluorescence Probe Properties

Hota

Singh

2014

J Fluoresc

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Numerous studies of donor-acceptor conjugated linear polyenes have been carried out with the goal to understand the exact nature of the excited state electronic structure and dynamics. In this article we discuss our endeavours with regard to the excited state intramolecular charge transfer, photoisomerization and fluorescence probe properties of various donor-acceptor substituted compounds of diphenylpolyene [Ar(CH = CH) Ar] series and ethenylindoles.

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“…However, DPP-based sensitizers have thus far exhibited limited use in DSCs242526272829. This may be due to an incomplete understanding of how to molecularly engineer this promising chromophore into a suitable DSC sensitizer, utilizing the donor- chromophore -anchor (D- C -A) motif.…”

mentioning

confidence: 99%

Blue-Coloured Highly Efficient Dye-Sensitized Solar Cells by Implementing the Diketopyrrolopyrrole Chromophore

Yum

Holcombe

Kim

et al. 2013

Sci Rep

155

128

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The paradigm shift in dye sensitized solar cells (DSCs) – towards donor- π bridge-acceptor (D-π-A) dyes – increases the performances of DSCs and challenges established design principles. Framed by this shifting landscape, a series of four diketopyrrolopyrrole (DPP)-based sensitizers utilizing the donor-chromophore-anchor (D-C-A) motif were investigated computationally, spectroscopically, and fabricated by systematic evaluation of finished photovoltaic cells. In all cases, the [Co(bpy)3]3+/2+ redox-shuttle afforded superior performance compared to I3−/I−. Aesthetically, careful molecular engineering of the DPP chromophore yielded the first example of a high-performance blue DSC – a challenge unmet since the inception of this photovoltaic technology: DPP17 yields over 10% power conversion efficiency (PCE) with the [Co(bpy)3]3+/2+ electrolyte at full AM 1.5 G simulated sun light.

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A novel compact DPP dye with enhanced light harvesting and charge transfer properties for highly efficient DSCs

Cited by 48 publications

References 38 publications

Heterogeneity in Dye–TiO₂ Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

Heterogeneity in Dye–TiO₂ Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

Donor-Acceptor Conjugated Linear Polyenes: A Study of Excited State Intramolecular Charge Transfer, Photoisomerization and Fluorescence Probe Properties

Blue-Coloured Highly Efficient Dye-Sensitized Solar Cells by Implementing the Diketopyrrolopyrrole Chromophore

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A novel compact DPP dye with enhanced light harvesting and charge transfer properties for highly efficient DSCs

Cited by 48 publications

References 38 publications

Heterogeneity in Dye–TiO2 Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

Heterogeneity in Dye–TiO2 Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

Donor-Acceptor Conjugated Linear Polyenes: A Study of Excited State Intramolecular Charge Transfer, Photoisomerization and Fluorescence Probe Properties

Blue-Coloured Highly Efficient Dye-Sensitized Solar Cells by Implementing the Diketopyrrolopyrrole Chromophore

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Product

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Heterogeneity in Dye–TiO₂ Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells

Heterogeneity in Dye–TiO₂ Interactions Dictate Charge Transfer Efficiencies for Diketopyrrolopyrrole-Based Polymer Sensitized Solar Cells