Electric field-assisted self-organization of polymer:fullerene hybrids on the photovoltaic performance

Lin, Chih Cheng; Lin, Yi-Hsiu; Li, Shao Sian; Yu, Cheng‐Ching; Huang, Chih-Hsin; Lee, Shun Han; Du, Chao; Lee, Jey Jau; Chen, Hsuen Li; Chen, Chun-Wei

doi:10.1039/c1ee01183a

Cited by 39 publications

(24 citation statements)

References 27 publications

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“…It is worth noting that the theory developed in this paper targets OSC small‐molecules because of their superior crystallinity, which allows very good resolution of their crystal packing by X‐ray diffraction and enables a detailed correlation between the applied field conditions and the final polymorph. Nonetheless, the same concepts are readily applicable to polymeric molecules (Figure S8, Supporting Information), which owing to their larger size are more prone to respond under the influence of external e‐fields as it has been previously shown during postprocessing treatments …”

Section: A Theoretical Consideration Of Dielectrophoresis Of Osc Molementioning

confidence: 71%

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Molina‐Lopez

Yan

et al. 2017

Adv Funct Materials

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Recent improvements in solution-coated organic semiconductors (OSCs) evidence their high potential for cost-efficient organic electronics and sensors. Molecular packing structure determines the charge transport property of molecular solids. However, it remains challenging to control the molecular packing structure for a given OSC. Here, the application of alternating electric fields is reported to fine-tune the crystal packing of OSC solution-shearing coated at ambient conditions. First, a theoretical model based on dielectrophoresis is developed to guide the selection of the optimal conditions (frequency and amplitude) of the electric field applied through the solutionshearing blade during coating of OSC thin films. Next, electric field-induced polymorphism is demonstrated for OSCs with both herringbone and 2D brickwall packing motifs in 2,7-dioctyl[1]benzothieno[3,2-b][1] benzothiophene and 6,13-bis(triisopropylsilylethynyl) pentacene, respectively. Favorable molecular packing can be accessible in some cases, resulting in higher charge carrier mobilities. This work provides a new approach to tune the properties of solution-coated OSCs in functional devices for highperformance printed electronics.

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Section: A Theoretical Consideration Of Dielectrophoresis Of Osc Molementioning

confidence: 71%

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Molina‐Lopez

Yan

et al. 2017

Adv Funct Materials

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“…Quite interestingly, the PBDT2FBT-T-O/PC 71 BM blend fi lm processed in CB exhibits the rod-like fi brillar nanostructures, which is benefi cial for the charge transport property. [ 55,56,60 ] As show in Figure S12 (Supporting Information), the space charge limited current (SCLC) mobility of PBDT2FBT-T-O in blend fi lm shows better performance than other polymers due to its well-ordered molecular packing property. However, a rough surface of the PBDT2FBT-T-O/PC 71 BM blend fi lm with large-scale phase separation and a relatively high-lying HOMO level decrease the photovoltaic parameters, which results in a PCE of 3.65%.…”

Section: Photovoltaic Performance and Film Morphologymentioning

confidence: 97%

Side‐Chain Engineering for Fine‐Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

Lee

Kim

Kang

et al. 2014

Advanced Energy Materials

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These specifi c design criteria promote high values of the short-circuit current ( J sc ), the open-circuit voltage ( V oc ), and the fi ll factor (FF) of PSCs, which are all related to the PCE. Therefore, tremendous effort has been devoted to optimizing these key parameters by developing new molecular structures and consequently several design rules have been proposed so far. [ 10 ] The side chains are important to ensure enough solubility of the resulting polymers for applications in solutionprocessable organic electronics. In addition to securing solubility, side chains play a multifunctional role in modulating the molecular weight, the optoelectronic properties, and the BHJ fi lm morphology, which all have a signifi cant impact on the performance of PSCs. [11][12][13][14][15][16][17] Thus, side chains should be carefully selected in order to improve the PCE. Despite their signifi cance, however, the exploration of the side chains of conjugated polymers has largely been overlooked until recently, in comparison with the extensive effort focused on developing new designs for their conjugated backbones. [18][19][20] Moreover, although a few studies have recently reported on the effects of side chains, these have not provided enough guidelines for other polymer systems. Therefore, systematic investigations are required to provide a comprehensive understanding of the correlations between the side chains of conjugated polymers and their photovoltaic performances for the further development of new materials and the improvement of PSC effi ciency.Here, we report the strategic side-chain engineering of lowbandgap polymers based on benzodithiophene-difl uorobenzothiadiazole (BDT-2FBT) copolymer system with the aim of achieving highly effi cient PSCs. By incorporating a series of functionalized side chains alkyl-, alkoxy-, alkylthienyl-, and alkoxythienyl chains into these copolymers, we investigated how the molecular tuning of side chains infl uences the key parameters determining the PCEs. Although several studies have been reported concerning the comparison between alkoxy-and alkylthienyl side chains, [ 7,8 ] there is no report on the simultaneous investigation into alkyl-, alkoxy-, alkylthienyl-, and alkoxythienyl chains with identical conjugated backbone. Furthermore, PBDT2FBT-T-O, which has the alkoxythienyl side chains appended on BDT moiety, has not been reported

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“…Both electron donor and acceptor molecules have an additional force to rearrange the film during the annealing treatment process. The molecular alignment could be adjusted during the volatilization of organic solvent from the active layer [45][46][47]. The effects of annealing treatment on the active layer or cell have been extensively carried out in order to improve the performance of PSCs, especially for the P3HT:PCBM system.…”

Section: Morphology Of Blend Film Adjusted By Post Treatmentmentioning

confidence: 99%

“…Lin et al [46] reported the electric field-assisted selforganization of polymer:fullerene hybrids to improve the photovoltaic performance. The "as-casted" device exhibits photovoltaic performance with a J sc of 6.14 mA/cm 2 , V oc of 0.53 V, and FF of 46%, resulting in a PCE of 1.51% under AM 1.5 (100 mW/cm 2 ) illumination.…”

Section: Morphology Of Blend Film Adjusted By Post Treatmentmentioning

confidence: 99%

Organic photovoltaic cells: Novel organic semiconducting materials and molecular arrangement engineering

et al. 2012

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Organic photovoltaic cells (OPVs) have attracted more and more attention due to its highly potential application to solve the energy crisis considering its advantages, such as low cost and ease of large area production. The power conversion efficiency (PCE) of OPVs has undergone a more than nine-fold increase from ~1.0% by Tang in 1986 to 9.2% in 2010 announced by Mitsubishi Chemical. The major challenges of obtaining high efficiency OPVs are the synthesis of new narrow band gap materials, controlling molecular arrangement, designing novel configuration cells for better photon harvesting in the active layer. In the article, we summarized the recent progress of novel narrow band gap photovoltaic materials and the effective methods to control the morphology of donor and acceptor in the blend films for high performance of OPVs. photovoltaic, narrow band gap materials, molecular arrangementCitation:

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Electric field-assisted self-organization of polymer:fullerene hybrids on the photovoltaic performance

Cited by 39 publications

References 27 publications

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Electric Field Tuning Molecular Packing and Electrical Properties of Solution‐Shearing Coated Organic Semiconducting Thin Films

Side‐Chain Engineering for Fine‐Tuning of Energy Levels and Nanoscale Morphology in Polymer Solar Cells

Organic photovoltaic cells: Novel organic semiconducting materials and molecular arrangement engineering

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