Bi-hierarchical nanostructures of donor–acceptor copolymer and fullerene for high efficient bulk heterojunction solar cells

Liao, Hsueh-Chung; Tsao, Cheng‐Si; Shao, Yu‐Tsun; Chang, Sue-Joan; Huang, Yu‐Ching; Chuang, Chih-Min; Lin, Tsung-Han; Chen, Charn-Ying; Su, Chun‐Jen; Jeng, U‐Ser; Chen, Yang‐Fang; Su, Wei‐Fang

doi:10.1039/c3ee24312e

Cited by 103 publications

(91 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such an interpenetrating network would provide a large interfacial area between the polymer and PC 71 BM, allowing effi cient exciton-dissociation and presenting a bi-continuous network that enhances charge transport and reduces recombination. [ 49 ] Indeed, the device with the PBDT2FBT-T/ PC 71 BM BHJ fi lm showed a highest PCE of 6.37% in this study. In contrast, the PBDT2FBT/PC 71 BM blending results in phase segregation during fi lm formation, which leads to the development of an unfavorably large domain size and a low PCE of 1.74%.…”

Section: Photovoltaic Performance and Film Morphologymentioning

confidence: 89%

“…We speculate that this might be due to the morphological variation in the blend fi lms, which can signifi cantly infl uence the exciton dissociation and charge transport. [ 48,49 ] To evaluate the BHJ morphology of the polymers/PC 71 BM fi lms, we used AFM, transmission electron microscopy (TEM) and GISAXS analysis. Thin fi lms of the PBDT2FBTs/PC 71 BM blends were prepared in CB ( Figure 7 ) and o-DCB ( Figure S10, Supporting Information) without any processing additives, or post-treatments.…”

Section: Photovoltaic Performance and Film Morphologymentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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

show abstract

Section: Photovoltaic Performance and Film Morphologymentioning

confidence: 89%

Section: Photovoltaic Performance and Film Morphologymentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Such a scattering profile has previously been interpreted to originate either from PCBM clusters 20,[46][47][48][49] or from the spatial arrangement of P3HT crystallites. 25,50 Since the scattering shoulder is absent in B-0 sample that contains PCBM clusters [Supporting Information Fig.…”

mentioning

confidence: 99%

Effects of amorphous poly(3‐hexylthiophene) on active‐layer structure and solar cells performance

Liu

Tseng

Cheng

et al. 2016

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

A key challenge to the development of polymerbased organic solar cells is the issue of long-term stability, which is mainly caused by the unstable time-dependent morphology of active layers. In this study, poly(3-hexylthiophene) (P3HT)/[6,6]-phenyl C60-butyric acid methyl ester (PCBM) blend is used as a model system to demonstrate that the long-term stability of power conversion efficiency can be significantly improved by the addition of a small amount of amorphous regiorandom P3HT into semicrystalline regioregular one. The optical properties measured by UV-vis absorption and photoluminescence reveal that regiorandom P3HT can intimately mix with PCBM and prevent the segregation of PCBM. In addition, X-ray scattering techniques were adopted to evidence the retardation of phase separation between P3HT and PCBM when regiorandom P3HT is added, which is further confirmed by optical microscopy that shows a reduction of large PCBM crystals after annealing at high temperature in the presence of regiorandom P3HT. The improvement of the long-term stability is attributed to the capability of amorphous P3HT to be thermodynamically miscible with PCBM, which allows the active layer to form a more stable structure that evolves slower and hence decelerates the device decay. V C 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 975-985

show abstract

“…4. 30 On the contrary, TEM images of blends spin-cast from a solution mixture containing a processing additive showed spherical-like domains of polymer which formed a phase separated system with PC 61 BM, in contrast with the featureless morphology obtained when no processing additive was used. Several other contributions also showed the increased phase separation upon the introduction of processing additives with TEM, 71,83 as well as AFM images.…”

Section: Effects Of Processing Additivesmentioning

confidence: 91%

“…More advanced AFM techniques such as conductive-AFM, photoconductive-AFM, and Kelvin probe microscopy provide further information on the D and A domains properties. [27][28][29][30] Phase separation can also be successfully characterized using scattering techniques such as grazing incidence small angle x-ray scattering and small angle neutron scattering (SANS). All of these techniques contribute to the understanding of the relationship between the processing history of a BHJ and the phase separation observed in the solid state.…”

Section: Effects Of the Morphology On Efficiencymentioning

confidence: 99%

Formulation strategies for optimizing the morphology of polymeric bulk heterojunction organic solar cells: a brief review

et al. 2014

View full text Add to dashboard Cite

Polymeric bulk heterojunction (BHJ) organic solar cells represent one of the most promising technologies for renewable energy with a low fabrication cost. Control over BHJ morphology is one of the key factors in obtaining high-efficiency devices. This review focuses on formulation strategies for optimizing the BHJ morphology. We address how solvent choice and the introduction of processing additives affect the morphology. We also review a number of recent studies concerning prediction methods that utilize the Hansen solubility parameters to develop efficient solvent systems.

show abstract

Bi-hierarchical nanostructures of donor–acceptor copolymer and fullerene for high efficient bulk heterojunction solar cells

Cited by 103 publications

References 33 publications

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

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

Effects of amorphous poly(3‐hexylthiophene) on active‐layer structure and solar cells performance

Formulation strategies for optimizing the morphology of polymeric bulk heterojunction organic solar cells: a brief review

Contact Info

Product

Resources

About