Effect of Interface Thickness on Power Conversion Efficiency of Polymer Photovoltaic Cells

Lee, Su-Hwan; Kim, Ji-Heon; Shim, Tae‐Hun; Park, Jea‐Gun

doi:10.3365/eml.2009.03.047

Cited by 47 publications

(24 citation statements)

References 17 publications

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“…Remarkably, the F8T2:PC 61 BM layer shows a relatively flat surface (Figure S in Supporting Information) indicating that the nanostructuring of BPhen is not due to a replication of the underneath surface topography. As far as we know, this is the first report showing columnar‐grain layers of thermally evaporated phenanthroline (BPhen or BCP), although studies of cells with BPhen evaporated over polymer:fullerene blends are scarce . In contrast with our results, one report mentions that the morphology of thermally deposited BPhen on top of the blend (P3HT:PC 61 BM) resembles to that of the underlying surface .…”

Section: Resultscontrasting

confidence: 99%

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Understanding the Role of Phenanthroline as Interlayer in Bulk Heterojunction Organic Photovoltaic Cells

et al. 2016

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We report on significant efficiency enhancement of bulk heterojunction organic photovoltaic cells based on blends of poly (9,9-dioctylfluorene-alt-bithiophene), F8T2, or poly[[4,8-bis [(2-ethylhexyl), with [6,6]-phenyl-C61-butyric acid methyl ester, PC 61 BM, upon thermally depositing a layer of a phenanthroline derivative, 4,7-diphenyl-1,10-phenanthroline, BPhen, or 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline, BCP, and LiF. We found that both phenanthroline derivatives form nanostructured layers and that the introduction of the LiF layer is crucial for the cells performance improvement. The interface between BPhen and LiF was investigated by X-ray photoelectron spectroscopy (XPS). This analysis suggested that charge-transfer doping of BPhen by fluoride is at the origin of improved electron transport throughout the BPhen layer. The best performing cells display power conversion efficiencies of 2.89 % and 5.89 %, for the blend with F8T2 and PTB7, respectively.

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Section: Resultscontrasting

confidence: 99%

“…However, polymer BHJ solar cells with BPhen or BCP layers have been seldom reported and only few systems were investigated . In such cells, BPhen or BCP were thermally evaporated on top of the blends and particular focus was devoted to the dependence of the cells efficiency on the phenanthroline layer thickness.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Role of Phenanthroline as Interlayer in Bulk Heterojunction Organic Photovoltaic Cells

et al. 2016

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“…strated for other insulating materials used in OPVs and organic light-emitting diodes, such as LiF. [24,25] Oxidation of the Al electrode is also known to be a major degradation pathway in conventional OPVs [26,27] and so, in general, Al is poorly suited as the substrate electrode in top-illuminated OPVs. Although Ag is much more stable towards oxidation than Al, its use erodes the cost advantage of OPVs due to its high cost.…”

Section: Introductionmentioning

confidence: 99%

A Silver‐Free, Reflective Substrate Electrode for Electron Extraction in Top‐Illuminated Organic Photovoltaics

et al. 2015

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The choice of metals suitable as the reflective substrate electrode for top-illuminated organic photovoltaics (OPVs) is extremely limited. Herein, we report a novel substrate electrode for this class of OPV architecture based on an Al | Cu | AlOx triple-layer structure, which offers a reflectivity comparable to that of Al over the wavelength range 400-900 nm, a work function suitable for efficient electron extraction in OPVs and high stability towards oxidation. In addition to demonstrating the advantage of this composite electrode over Al in model top-illuminated OPVs, we also present the results of a photoelectron spectroscopy study, which show that an oxidised 0.8 nm Al layer deposited by thermal evaporation onto an Al | Cu reflective substrate electrode is sufficient to block oxidation of the underlying Cu by air or during deposition of a ZnO1-x electron-transport layer. This is remarkable given that the self-limiting oxide thickness on Al metal is greater than 2 nm.

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“…Additionally, [6,6]‐phenyl‐C61‐butyric acid methyl ester (PCBM) synthesized by Wudl and co‐workers is one of the most important fullerene derivatives and is a widely used acceptor material even now. Although the first fabricated P3HT:PCBM‐based cells possessed a power conversion efficiency (PCE) of only 2.8% in 2002, only 7 years later, in 2009, the highest reported efficiency of OPVs based on P3HT:PCBM improved up to 6.5%, as reported by Lee et al…”

Section: Flexible Opvsmentioning

confidence: 77%

Organic Flexible Electronics

et al. 2018

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During the past two decades, the vigorous development of flexible organic semiconductor devices has heralded a new era of human society due to their promising applications in portable, wearable, implantable, and biological electronics. In recent years, exciting progress has been made on various flexible electronic devices, including organic light‐emitting diodes, organic photovoltaics, organic thin‐film transistors, organic flexible integrated circuits, sensors, and memories. Here, to provide a comprehensive and up‐to‐date review on this emerging field, the focus is on the critical issues of organic devices, including material choice, device design, mechanical flexibility, strain effects, and processing techniques, as well as some specific applications that have been successfully developed. Finally, a conclusion and an outlook for the future development of this field are given.

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Effect of Interface Thickness on Power Conversion Efficiency of Polymer Photovoltaic Cells

Cited by 47 publications

References 17 publications

Understanding the Role of Phenanthroline as Interlayer in Bulk Heterojunction Organic Photovoltaic Cells

Understanding the Role of Phenanthroline as Interlayer in Bulk Heterojunction Organic Photovoltaic Cells

A Silver‐Free, Reflective Substrate Electrode for Electron Extraction in Top‐Illuminated Organic Photovoltaics

Organic Flexible Electronics

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