Evaluation of Heterocycle-Modified Pentathiophene-Based Molecular Donor Materials for Solar Cells

Yu, Qingcai; Fu, Weifei; Wan, Jun‐Hua; Wu, Xiao‐Feng; Shi, Minmin; Chen, Hongzheng

doi:10.1021/am5006223

Cited by 45 publications

(32 citation statements)

References 70 publications

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“…Device performance was significantly enhanced with the use of additives. The device performance was 2.19%, with a Voc of 0.57 V, a Jsc of 9.67 mA·cm (12) with diketopyrrolopyrrole (DPP) as the terminal acceptor units and pentathiophene as the central donor unit [24]. The absorption spectra of 12 in solution showed only one main absorption band at 600 nm, indicating an intermolecular charge transfer (ICT) between the donor and acceptor units.…”

Section: Solution-processed Fused-thiophene-based Small Molecules Formentioning

confidence: 99%

“…Later, Grätzel et al group modified the anchoring group into cyano-substituted benzoic acid to make efficient sensitizers (22)(23)(24)(25)(26) [41,42]. They found that the cyano-subsituent improved the ICT and allowed for a better adsorption on TiO2, thus leading to improved DSSC performance.…”

Section: Fused-thiophene-based Sensitizers In Dye-sensitized Solar Cellsmentioning

confidence: 99%

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Fused-Thiophene Based Materials for Organic Photovoltaics and Dye-Sensitized Solar Cells

et al. 2014

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Organic photovoltaics (OPVs) and dye-sensitized solar cells (DSSCs) have drawn great interest from both academics and industry, due to the possibility of low-cost conversion of photovoltaic energy at reasonable efficiencies. This review focuses on recent progress in molecular engineering and technological aspects of fused-thiophene-based organic dye molecules for applications in solar cells. Particular attention has been paid to the design principles and stability of these dye molecules, as well as on the effects of various electrolyte systems for DSSCs. Importantly, it has been found that incorporation of a fused-thiophene unit into the sensitizer has several advantages, such as red-shift of the intramolecular charge transfer band, tuning of the frontier molecular energy level, and improvements in both photovoltaic performance and stability. This work also examines the correlation between the physical properties and placement of fused-thiophene in the molecular structure with regard to their performance in OPVs and DSSCs. OPEN ACCESSPolymers 2014, 6 2646

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Section: Solution-processed Fused-thiophene-based Small Molecules Formentioning

confidence: 99%

Section: Fused-thiophene-based Sensitizers In Dye-sensitized Solar Cellsmentioning

confidence: 99%

Fused-Thiophene Based Materials for Organic Photovoltaics and Dye-Sensitized Solar Cells

et al. 2014

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“…In general, a potential smallmolecular donor material should possess several key properties, such as a wide and strong absorption spectrum with a large overlap with the solar emission spectrum, suitable molecular orbital energy levels matching those of acceptors and electrode, a high charge mobility, and so on [14,15]. A common strategy to enhance the PCE of OSCs is to adjust the Electronic supplementary material The online version of this article (doi:10.1007/s00894-015-2885-9) contains supplementary material, which is available to authorized users.…”

Section: Introductionmentioning

confidence: 99%

“…Diketopyrrolopyrrole (DPP) has been used widely to construct conjugated polymers or small molecules as donors for OSC applications because of its strong electron-deficient property [15,17,25,26]. DPP-based small molecules with an acceptor-core-acceptor (A-core-A) structure have attracted great attention and exhibited promising PCEs [15,17,[25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

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Theoretical investigations on enhancing the performance of terminally diketopyrrolopyrrole-based small-molecular donors in organic solar cell applications

et al. 2015

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Diketopyrrolopyrrole (DPP)-based small molecules with acceptor-core-acceptor (A-core-A) type as donor materials have been used successfully in organic solar cells (OSC). In this work, based on the DPP-core-DPP type molecule SM1 consisting of a DPP unit as acceptor and benzene as the core, we replaced the benzene core with more electron-withdrawing groups in SM1 and further designed four new small-molecular donors (SM2-SM5) in order to improve the electrical properties, optical absorption and performance in OSC applications. The calculated results indicate that the designed small-molecular donors SM2-SM5 exhibit better performances in comparison with SM1, such as lower highest occupied molecular orbital (HOMO), narrower energy gap, larger absorption range, better electronic transfer between donor and acceptor and higher hole mobility. Moreover, the decreased HOMO levels and transition energy of small-molecular donors in OSC applications play an important role in the parameters of open-current voltage, fill factor and short-circuit current. Consequently, adjusting the electron-deficient ability of cores in DPP-core-DPP type small-molecular donors is an efficient approach that can be used to obtain high-efficiency DPP-based small-molecular donors for OSC applications. Graphical Abstract The designed small-molecules with good electronic and photophysical properties will act as a promising donor candidate for organic solar cell applications. Moreover, The decreased HOMO levels and transition energy of small-molecular donors in OSC applications play an important role in the parameters of open-current voltage, fill factor and short-circuit current.

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Spiro Linkage as an Alternative Strategy for Promising Nonfullerene Acceptors in Organic Solar Cells

et al. 2015

Adv Funct Materials

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This work focuses on developing diketopyrrolopyrrole (DPP)-based small molecular nonfullerene acceptors for bulk heterojunction (BHJ) organic solar cells. The materials, SF-DPP s, have an X-shaped geometry arising from four DPP units attached to a spirobifl uorene (SF) center. The spiro-dimer of DPP-fl uorene-DPP is highly twisted, which suppresses strong intermolecular aggregation. Branched 2-ethylhexyl (EH), linear n -octyl (C8), and n -dodecyl (C12) alkyl sides are chosen as substituents to functionalize the N , N -positions of the DPP moiety to tune molecular interactions. SF-DPPEH , the best candidate in SF-DPP s family, when blended with poly(3-hexylthiophene) (P3HT) showed a moderate crystallinity and gives a J sc of 6.96 mA cm −2 , V oc of 1.10 V, a fi ll factor of 47.5%, and a power conversion effi ciency of 3.63%. However, SF-DPPC8 and SF-DPPC12 exhibit lower crystallinity in their BHJ blends, which is responsible for their reduced J sc . Coupling DPP units with SF using an acetylene bridge yields SF-A-DPP molecules. Such a small modification leads to drastically different morphological features and far inferior device performance. These observations demonstrate a solid structureproperty relationship by topology control and material design. This work offers a new molecular design approach to develop effi cient small molecule nonfullerene acceptors.

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Evaluation of Heterocycle-Modified Pentathiophene-Based Molecular Donor Materials for Solar Cells

Cited by 45 publications

References 70 publications

Fused-Thiophene Based Materials for Organic Photovoltaics and Dye-Sensitized Solar Cells

Fused-Thiophene Based Materials for Organic Photovoltaics and Dye-Sensitized Solar Cells

Theoretical investigations on enhancing the performance of terminally diketopyrrolopyrrole-based small-molecular donors in organic solar cell applications

Spiro Linkage as an Alternative Strategy for Promising Nonfullerene Acceptors in Organic Solar Cells

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