Nitrile‐Substituted QA Derivatives: New Acceptor Materials for Solution‐Processable Organic Bulk Heterojunction Solar Cells

Zhou, Tianlei; Jia, Tao; Kang, Bonan; Li, Fenghong; Fahlman, Mats; Wang, Yue

doi:10.1002/aenm.201100082

Cited by 141 publications

(94 citation statements)

References 55 publications

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“…The P3HT:8i bulk heterojunction solar cells give an efficiency of 1.43 % with a V OC of 0.54 V, J SC of 4.85 mA cm −2 , and FF of 0.547 [96]. Wang developed a class of DCV-substituted quinacridone derivatives [97]. This family of SMs showed intense absorption in the region from 650 to 700 nm where the donor component P3HT has a weak absorption.…”

Section: Organic Molecule Acceptorsmentioning

confidence: 97%

Organic Semiconductor Photovoltaic Materials

Zhang

2015

Lecture Notes in Chemistry

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Organic solar cells (OSCs) are an emerging alternative photovoltaic technology and thus they have recently gained much attention. In this chapter, recent developments in organic photovoltaic materials, involving small molecule donors and non-fullerene acceptors for vacuum and solution-processed photovoltaic cells, are summarized. A general overview of the structure-property relationships of these organic photovoltaic materials and the design rules for such materials is presented. Critical factors which determined their photophysical properties such as energy levels, absorption, and carrier mobilities are also highlighted.

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Section: Organic Molecule Acceptorsmentioning

confidence: 97%

Organic Semiconductor Photovoltaic Materials

Zhang

2015

Lecture Notes in Chemistry

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“…To date, most of the successful NFAs are derived from strong electron deficient units, such as aromatic diimides (perylene diimides, naphthalene diimides, etc.) [9][10][11][12][13][14][15][16][17], dicyanovinyl [18][19][20], diketopyrrolopyrrole [21,22], and benzothiadiazole [23,24]. Among them, rod-like acceptordonor-acceptor (A-D-A) structured molecules in which an electron-rich fused-ring core is used as a central donor and two strong electron-withdrawing groups are used as acceptors, are promising for high performance OSCs because their optical and electronic properties can be easily tuned by varying the fused-ring core or the terminal groups, in comparison with those of fullerene-based electron acceptors or aromatic diimide-based NFAs [25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric indenothiophene-based non-fullerene acceptors for efficient polymer solar cells

et al. 2017

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“…It has also been demonstrated that by engineering an acceptor material to have complementary absorption with the donor material, the blend films can absorb over a wide range of wavelengths 80,152 . In this context at COPE, a non-fullerene acceptor material [YF25 (see Figure 5.1)] was designed to have narrower optical gap than P3HT (2 eV) and high electron affinity 80 .…”

Section: Chapter 5 -Synthesis Physical Transporting and Photovoltaimentioning

confidence: 99%

“…However, recently it has been well established that both donor and acceptor can absorb light leading to charge generation through both Channels (I and II) 80,151,152 . In Chapter 3 it was found that for OddDPP(ThBt) 2 for wavelengths above 700 nm charge generation was primarily through Channel I and wavelengths shorter than 700 nm both Channels were in play.…”

Section: Chapter 5 -Synthesis Physical Transporting and Photovoltaimentioning

confidence: 99%

Low optical gap materials for organic solar cells - research and application

Chandrasekharan¹

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In spite of the cost of silicon solar cells decreasing in recent years, there is considerable interest in solar cells with lightweight and flexible forms. Organic semiconductor-based photovoltaic cells (OPVs) have the potential to offer low cost, lightweight and flexible devices. At this stage there is still much to be improved for OPVs as the efficiencies are still lower than their inorganic counterparts. Polymeric materials have been more widely studied than their non-polymeric counterparts. In recent years OPVs polymeric donor materials have emerged with efficiencies reaching 10% with quite a range of materials now providing efficiencies of around 7%. However, the problem with semiconducting polymers is that control of the regioregularity, poly(dispersity), and molecular weight from batch-to-batch is not a simple process. Solution-processable nonpolymeric semiconductors are attractive for opto-electronic applications as they are simpler to synthesise, purify, characterise, and the optical properties can be more easily fine-tuned. In this context, diketopyrrolopyrrole (DPP) based small molecules have shown promising results with devices efficiencies reaching around 5-6%. Key properties of the DPP unit are strong π-π interactions, and suitable and tunable energy levels. These properties have been the main drivers in their use in OPVs.This thesis consist of the synthesis, characterisation, and bulk hetrojunction (BHJ) devices properties of novel DPP(ThAr) 2 non-polymeric materials. Accordingly, a first series of compounds was synthesized with different electron affinity groups such as fluorenone (Fl) [EhDPP(ThFl) 2 and OddDPP(ThFl) 2 ] and benzothiadiazole (Bt) [OddDPP(ThBt) 2 ] attached to the distal ends of a bisthienyl-diketopyrrolopyrrole unit DPP(Th) 2 unit. The 'DPP(ThAr) 2 ' derivatives were synthesised under standard Suzuki-Miyaura cross-coupling or by direct arylation reaction conditions and the rate of the direct arylation reaction was found to be faster than for the Suzuki-Miyaura crosscoupling reactions. The solubility of the compounds was poor when the 2-ethylhexyl (Eh) moiety was used as the solubilising group for DPP(ThFl) 2 . 2-Octyldodecyl (Odd) solubilising groups gave better solubility in chlorinated solvents, which are typically used in OPV fabrication. The three nonpolymeric DPP materials exhibited bipolar charge transport in organic field effect transistors (OFETs), with hole and electron mobility in the order of 10 -2 −10 -3 cm 2 V -1 s -1 , and in a diode architecture OddDPP(ThFl) 2 and OddDPP(ThBt) 2 exhibited mobilities of the order of 10 -4 cm 2 V -1 s -1 for pristine films. In BHJ devices using [6,6]-phenyl-C70-butyric acid methyl ester (PC70BM)as the acceptor, different solvent mixtures were used for device fabrication to achieve the maximum efficiency. The EQE spectra of the blend film suggested that charge generation due to absorption at iii wavelengths longer than 750 nm occurred through the Channel I pathway, and at wavelengths shorter than 750 nm, both Channel I and II ...

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Nitrile‐Substituted QA Derivatives: New Acceptor Materials for Solution‐Processable Organic Bulk Heterojunction Solar Cells

Cited by 141 publications

References 55 publications

Organic Semiconductor Photovoltaic Materials

Organic Semiconductor Photovoltaic Materials

Asymmetric indenothiophene-based non-fullerene acceptors for efficient polymer solar cells

Low optical gap materials for organic solar cells - research and application

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