Recent advances of non-fullerene, small molecular acceptors for solution processed bulk heterojunction solar cells

Eftaiha, Ala’a F.; Sun, Jon‐Paul; Hill, Ian G.; Welch, Gregory C.

doi:10.1039/c3ta14236a

Cited by 372 publications

(269 citation statements)

References 145 publications

(181 reference statements)

Supporting

Mentioning

261

Contrasting

Unclassified

Order By: Relevance

“…This issue was, however, partially overcome by using PC70BM (see Figure 1.10) as an acceptor, which has higher optical density over a wide range of wavelengths in the visible region 80 . The other main drawbacks of these PCBMs are the limited scope of synthetic modification 81 . Hence, the optical properties of the PCBMs cannot be fine-tuned precisely to have complementary absorption to the donor materials.…”

Section: Dpp Based Non-polymeric Materials For Opvsmentioning

confidence: 99%

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

Chandrasekharan¹

View full text Add to dashboard Cite

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 ...

show abstract

Section: Dpp Based Non-polymeric Materials For Opvsmentioning

confidence: 99%

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

Chandrasekharan¹

View full text Add to dashboard Cite

show abstract

“…Face to this consideration, promising light-emitting materials such as Firpic [5], Ir(ppy) 3 [6], Ir(piq) 3 [7], DCJTB [8], MEH-PPV [9][10][11] or DPVBi [12] have been extensively studied in the literature so that some of these materials have been largely popularized by the number of publications devoted to their studies. Among emitters, phthalimide-based materials are an attractive class of materials by their good electron-transport abilities [13,14] and their remarkable electron-accepting ability [15,16]. When combined with the oligophenylenevinylene core, materials with a wide bandgap can be designed, the phthalimide part conferring the electron-transport properties lacking to the oligophenylene central core [17].…”

Section: Introductionmentioning

confidence: 99%

Organic Light-Emitting Diodes Based on Phthalimide Derivatives: Improvement of the Electroluminescence Properties

2018

View full text Add to dashboard Cite

Abstract:In this study, a phthalimide-based fluorescent material has been examined as a green emitter for multilayered organic light-emitting diodes (OLEDs). By optimizing the device stacking, a maximum brightness of 28,450 cd/m 2 at 11.0 V and a maximum external quantum efficiency of 3.11% could be obtained. Interestingly, OLEDs fabricated with Fluo-2 presented a 20-fold current efficiency improvement compared to the previous results reported in the literature, evidencing the crucial role of the device stacking in the electroluminescence (EL) performance of a selected emitter. Device lifetime was also examined and an operational stability comparable to that reported for a standard triplet emitter i.e., bis(4-methyl-2,5-diphenyl-pyridine)iridium(III) acetylacetonate [(mdppy) 2 Iracac] was evidenced.

show abstract

“…For example [6,6]-phenyl C61 butyric acid methyl ester (PCBM) is a fullerene derivative which has excellent acceptor characteristics. Unfortunately, PCBM also has some disadvantages such as air degradation and cost intensive synthesis [7,8]. The need for new acceptor materials for organic photovoltaics is growing rapidly.…”

Section: Introductionmentioning

confidence: 99%

A Novel Acrylonitrile Derivative Having Photovoltaic Performance

Yorur-Goreci

Kazıcı²,

Bozar³

et al. 2016

J. Turk. Chem. Soc., Sect. A: Chem.

View full text Add to dashboard Cite

A new acrylonitrile derivative, 2-(4-bromophenyl)-3-{5-[2-cyano-2-phenylethenyl]furan-2-yl}acrylonitrile (BPCPFA, 3)which is a potential material for application in organic solar cells, was synthesized by a three-step reaction. The structures of the molecules synthesized in these steps were characterized by using various spectral analyses. BPCPFA was investigated as an electron acceptor molecule in next generation organic solar cells. Theoretical prediction and experimental studies for photovoltaic performance were also performed. Based on these results, it is concluded that BPCPFA with extended conjugated system has good and promising photovoltaic performance with Voc value as 0.96 V.

show abstract

Recent advances of non-fullerene, small molecular acceptors for solution processed bulk heterojunction solar cells

Cited by 372 publications

References 145 publications

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

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

Organic Light-Emitting Diodes Based on Phthalimide Derivatives: Improvement of the Electroluminescence Properties

A Novel Acrylonitrile Derivative Having Photovoltaic Performance

Contact Info

Product

Resources

About