Self‐Organized Buffer Layers in Organic Solar Cells

Wei, Qingshuo; Nishizawa, Takeshi; Tajima, Kazuo; Hashimoto, Kazuhito

doi:10.1002/adma.200792876

Cited by 265 publications

(219 citation statements)

References 34 publications

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“…[40] Another approach was to synthesize a fullerene derivative with a fluorinated octyl branch that self-segregates to the film/air interface; this technique increased the performance of a P3HT/ C 61 -PCBM solar cell from 3.1 to 3.8% PCE. [41] Both approaches are significant steps towards using energetically preferred interfacial compositions to improve device performance.…”

Section: Methods For Optimizing the Bhj Nanomorphologymentioning

confidence: 99%

The Role of Processing in the Fabrication and Optimization of Plastic Solar Cells

et al. 2009

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The development of high‐efficiency plastic solar cells is rapidly accelerating as the need for economically viable alternative energy sources becomes evident. Polymer‐based bulk‐heterojunction (BHJ) solar cells are attractive in that they can be coated from solution onto flexible substrates by a variety of techniques and thus inexpensive large‐volume manufacturing should be possible. Further, the inherent flexibility of the polymeric materials combined with thin photovoltaic active layers results in devices that can be adapted to a variety of unique aesthetics and form factors. Recent advances in key relationships between thin‐film casting methods, bulk‐heterojunction morphology, and device performance have occurred in tandem with the synthesis of novel polymer semiconductors that possess increased optical‐absorption breadth and optoelectronic performance. This Research News article highlights a few techniques developed to optimize the BHJ nanomorphology and performance of solar cells fabricated by various solution‐processing methods.

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Section: Methods For Optimizing the Bhj Nanomorphologymentioning

confidence: 99%

The Role of Processing in the Fabrication and Optimization of Plastic Solar Cells

et al. 2009

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“…[140] Recently, Wei et al synthesized a new fullerene derivative with a fluorocarbon chain (F-PCBM), and blended into P3HT:PCBM solution. [141] F-PCBM preferentially segregates a layer 2 nm thick at the top surface due to the lower surface energy from the fluorinated side groups. [142] Via this approach, the FF increased to an impressively high 72%, and was mainly attributed to the surface dipole moment induced by the F-PCBM layer, which decreased the energy barrier between the Al cathode and the PCBM.…”

Section: à2mentioning

confidence: 99%

Recent Progress in Polymer Solar Cells: Manipulation of Polymer:Fullerene Morphology and the Formation of Efficient Inverted Polymer Solar Cells

et al. 2009

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Polymer morphology has proven to be extremely important in determining the optoelectronic properties in polymer‐based devices. The understanding and manipulation of polymer morphology has been the focus of electronic and optoelectronic polymer‐device research. In this article, recent advances in the understanding and controlling of polymer morphology are reviewed with respect to the solvent selection and various annealing processes. We also review the mixed‐solvent effects on the dynamics of film evolution in selected polymer‐blend systems, which facilitate the formation of optimal percolation paths and therefore provide a simple approach to improve photovoltaic performance. Recently, the occurrence of vertical phase separation has been found in some polymer:fullerene bulk heterojunctions.1–3 The origin and applications of this inhomogeneous distribution of the polymer donor and fullerene acceptor are addressed. The current status and device physics of the inverted structure solar cells is also reviewed, including the advantage of utilizing the spontaneous vertical phase separation, which provides a promising alternative to the conventional structure for obtaining higher device performance.

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“…The low surface energy of this group drives it to the air interface during coating, where it acts as a buffer layer, reducing the electron injection barrier between PCBM and the aluminum anode and resulting in a significant enhancement in device performance. 29 The thermal stability of the device blend, particularly under operating conditions, has also been a concern since it may alter by diffusion or crystallization over time. One approach to improve thermal stability has been to derivatise the fullerene derivative with bulky aromatic groups which suppress crystallization in the blend.…”

Section: Factors Influencing the Structure And Performance Of Fullerementioning

confidence: 99%

Influence of blend microstructure on bulk heterojunction organic photovoltaic performance

et al. 2011

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This tutorial review discusses the factors influencing blend microstructure and performance in bulk heterojunction organic photovoltaic cells.Please check this proof carefully. Our staff will not read it in detail after you have returned it. Translation errors between word-processor files and typesetting systems can occur so the whole proof needs to be read. Please pay particular attention to: tabulated material; equations; numerical data; figures and graphics; and references. If you have not already indicated the corresponding author(s) please mark their name(s) with an asterisk. Please e-mail a list of corrections or the PDF with electronic notes attached --do not change the text within the PDF file or send a revised manuscript.Please bear in mind that minor layout improvements, e.g. in line breaking, table widths and graphic placement, are routinely applied to the final version.Please note that, in the typefaces we use, an italic vee looks like this: n, and a Greek nu looks like this: n.We will publish articles on the web as soon as possible after receiving your corrections; no late corrections will be made.Please return your final corrections, where possible within 48 hours of receipt, by e-mail to: chemsocrev@rsc.org Reprints-Electronic (PDF) reprints will be provided free of charge to the corresponding author. Enquiries about purchasing paper reprints should be addressed via: http://www.rsc.org/Publishing/ReSourCe/PaperReprints/. Costs for reprints are below: Q3The sentence beginning ''For example it has been shown. . .'' has been altered for clarity, please check that the meaning is correct. Q4The citation to ' Fig. 8(a)' in the sentence beginning 'Grazing-incidence X-ray diffraction (XRD) measurements. . .' has been changed to ' Fig. 10(a)' as the text appears to discuss ' Fig. 10(a)'. Please check that this is correct. Q5The citation to ' Fig. 8(b)' in the sentence beginning 'Upon annealing, P3HT chains begin to crystallize. . .' has been changed to ' Fig The performance of organic photovoltaic devices based upon bulk heterojunction blends of donor and acceptor materials has been shown to be highly dependent on the thin film microstructure. In this tutorial review, we discuss the factors responsible for influencing blend microstructure and how these affect device performance. In particular we discuss how various molecular design approaches can affect the thin film morphology of both the donor and acceptor components, as well as their blend microstructure. We further examine the influence of polymer molecular weight and blend composition upon device performance, and discuss how a variety of processing techniques can be used to control the blend microstructure, leading to improvements in solar cell efficiencies.

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Self‐Organized Buffer Layers in Organic Solar Cells

Cited by 265 publications

References 34 publications

The Role of Processing in the Fabrication and Optimization of Plastic Solar Cells

The Role of Processing in the Fabrication and Optimization of Plastic Solar Cells

Recent Progress in Polymer Solar Cells: Manipulation of Polymer:Fullerene Morphology and the Formation of Efficient Inverted Polymer Solar Cells

Influence of blend microstructure on bulk heterojunction organic photovoltaic performance

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