LIVIVO - Search results -

Search results

Result 1 - 9 of total 9

Search options

Book ; Online: Chapter Solution-Processed Graphene-Based Transparent Conductive Electrodes as Ideal ITO Alternatives for Organic Solar Cells

Stylianakis, Minas M. / Konios, Dimitrios / Petridis, Konstantinos / Kymakis, Emmanuel

2017

Keywords	Solid state chemistry ; organic solar cells, transparent electrodes, graphene, reduction
Size	1 Online-Ressource
Publisher	InTechOpen
Document type	Book ; Online
Note	English ; Open Access
HBZ-ID	HT021051201
Database	ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾

Article: Electron field emission from graphene oxide wrinkles

Viskadouros, Georgios / Konios, Dimitrios / Kymakis, Emmanuel / Stratakis, Emmanuel

RSC advances. 2016 Jan. 04, v. 6, no. 4

2016

Abstract: We report a simple and general solution-based methodology to support reduced graphene oxide layers (rGO) onto micro-spikes engraved on Si to produce high-aspect ratio wrinkles and sharp protrusions. It is observed that as the number of deposited rGO ... ...

Abstract	We report a simple and general solution-based methodology to support reduced graphene oxide layers (rGO) onto micro-spikes engraved on Si to produce high-aspect ratio wrinkles and sharp protrusions. It is observed that as the number of deposited rGO layers is increased the wrinkle density progressively increases complemented by a remarkable folding of graphene sheets at the vicinity of the spike tips. Highly efficient and stable field emission with low turn-on fields was observed, attributed to the local enhancement of the electric field at the wrinkled rGO protrusions. The ability to produce wrinkled graphene from solution could allow large area deposition providing prospects for the development of practical electron sources and advanced devices based on graphene oxide field emitters. The contribution of this hierarchical, hybrid film morphology is evaluated and discussed.
Keywords	electric field ; films (materials) ; graphene ; graphene oxide ; silicon
Language	English
Dates of publication	2016-0104
Size	p. 2768-2773.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/c5ra23031d
Database	NAL-Catalogue (AGRICOLA)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Slow photocharging and reduced hysteresis in low-temperature processed planar perovskite solar cells

Vaenas, Naoum / Konios, Dimitrios / Stergiopoulos, Thomas / Kymakis, Emmanuel

RSC advances. 2015 Dec. 21, v. 5, no. 130

2015

Abstract: High efficient organolead trihalide perovskite solar cells typically utilize high temperature processed TiO₂ as the electron transporting layer (ETL). A new method for the preparation of low temperature processed amorphous TiO₂ as the ETL in planar ... ...

Abstract	High efficient organolead trihalide perovskite solar cells typically utilize high temperature processed TiO₂ as the electron transporting layer (ETL). A new method for the preparation of low temperature processed amorphous TiO₂ as the ETL in planar perovskite solar cells is demonstrated. The proposed technique allowed the entire fabrication of perovskite solar cells with power conversion efficiencies as high as 13.7%, to take place at temperatures lower than 150 °C. We revealed that the source of device efficiency lies in the fast and balanced charge transport within the selective contacts as well as the effective charge extraction from the perovskite.
Keywords	hysteresis ; solar cells ; solar energy ; temperature ; titanium dioxide
Language	English
Dates of publication	2015-1221
Size	p. 107771-107776.
Publishing place	The Royal Society of Chemistry
Document type	Article
ISSN	2046-2069
DOI	10.1039/c5ra23845e
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Highly efficient organic photovoltaic devices utilizing work-function tuned graphene oxide derivatives as the anode and cathode charge extraction layers

Konios, Dimitrios / Kakavelakis, George / Petridis, Costantinos / Savva, Kyriaki / Stratakis, Emmanuel / Kymakis, Emmanuel

Journal of materials chemistry A. 2016 Jan. 26, v. 4, no. 5

2016

Abstract: The effective utilization of work-function (WF) tuned solution processable graphene-based derivatives as both hole and electron transport layers in organic photovoltaic (OPV) devices is demonstrated. The systematic tuning of the functionalized graphene ... ...

Abstract	The effective utilization of work-function (WF) tuned solution processable graphene-based derivatives as both hole and electron transport layers in organic photovoltaic (OPV) devices is demonstrated. The systematic tuning of the functionalized graphene oxide (GO) WF took place by either photochlorination for WF increase, or lithium neutralization for WF decrease. In this way, the WF of the photochlorinated GO layer was perfectly matched with the HOMO level of two different polymer donors, enabling excellent hole transport. Meanwhile the WF of the lithium functionalized GO was perfectly matched with the LUMO level of the fullerene acceptor, enabling excellent electron transport. The utilization of these graphene-based hole and electron transport layers in PTB7:PC71BM active layer devices led to ∼19% enhancement in the power conversion efficiency (PCE) compared to that of the reference graphene free device, resulting in the highest reported PCE for graphene-based buffer layer OPVs of 9.14%. The proposed techniques open new paths towards novel material and interface engineering approaches for a wide range of new applications, including flexible electronic devices, OPVs, perovskite solar cells, organic light emitting diodes, and photosensors, as well as traditional electronic devices.
Keywords	anodes ; cathodes ; electron transfer ; fullerene ; graphene ; graphene oxide ; light emitting diodes ; lithium ; neutralization ; polymers ; solar cells
Language	English
Dates of publication	2016-0126
Size	p. 1612-1623.
Publishing place	The Royal Society of Chemistry
Document type	Article
ZDB-ID	2702232-8
ISSN	2050-7496 ; 2050-7488
ISSN (online)	2050-7496
ISSN	2050-7488
DOI	10.1039/c5ta09712f
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Improving the efficiency of organic photovoltaics by tuning the work function of graphene oxide hole transporting layers.

Stratakis, Emmanuel / Savva, Kyriaki / Konios, Dimitrios / Petridis, Constantinos / Kymakis, Emmanuel

Nanoscale

2014 Volume 6, Issue 12, Page(s) 6925–6931

Abstract: A facile, fast, non-destructive and roll-to-roll compatible photochemical method for simultaneous partial reduction and doping of graphene oxide (GO) films through ultraviolet laser irradiation in the presence of a Cl2 precursor gas is demonstrated. The ... ...

Abstract	A facile, fast, non-destructive and roll-to-roll compatible photochemical method for simultaneous partial reduction and doping of graphene oxide (GO) films through ultraviolet laser irradiation in the presence of a Cl2 precursor gas is demonstrated. The photochemical chlorinated GO-Cl films were fully characterized by XPS and Raman measurements, in which grafting of chloride to the edges and the basal plane of GO was confirmed. By tuning the laser exposure time, it is possible to control the doping and reduction levels and therefore to tailor the work function (WF) of the GO-Cl layers from 4.9 eV to a maximum value of 5.23 eV. These WF values match with the HOMO level of most polymer donors employed in OPV devices. Furthermore, high efficiency poly(2,7-carbazole) derivative (PCDTBT):fullerene derivative (PC71BM) based OPVs with GO-Cl as the hole transporting layer (HTL) were demonstrated with a power conversion efficiency (PCE) of 6.56% which is 17.35% and 19.48% higher than that of the pristine GO and PEDOT:PSS based OPV devices, respectively. The performance enhancement was attributed to more efficient hole transportation due to the energy level matching between the GO-Cl and the polymer donor.
Language	English
Publishing date	2014-06-21
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2515664-0
ISSN	2040-3372 ; 2040-3364
ISSN (online)	2040-3372
ISSN	2040-3364
DOI	10.1039/c4nr01539h
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Dispersion behaviour of graphene oxide and reduced graphene oxide.

Konios, Dimitrios / Stylianakis, Minas M / Stratakis, Emmanuel / Kymakis, Emmanuel

Journal of colloid and interface science

2014 Volume 430, Page(s) 108–112

Abstract: The dispersion behaviour of graphene oxide (GO) and chemically reduced GO (rGO) has been investigated in a wide range of organic solvents. The effect of the reduction process on the GO solubility in eighteen different solvents was examined and analysed, ... ...

Abstract	The dispersion behaviour of graphene oxide (GO) and chemically reduced GO (rGO) has been investigated in a wide range of organic solvents. The effect of the reduction process on the GO solubility in eighteen different solvents was examined and analysed, taking into consideration the solvent polarity, the surface tension and the Hansen and Hildebrand solubility parameters. rGO concentrations up to ∼9 μg/mL in chlorinated solvents were achieved, demonstrating an efficient solubilization strategy, extending the scope for scalable liquid-phase processing of conductive rGO inks for the development of printed flexible electronics.
Language	English
Publishing date	2014-09-15
Publishing country	United States
Document type	Journal Article
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2014.05.033
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

Z 71/707: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article: Dispersion behaviour of graphene oxide and reduced graphene oxide

Konios, Dimitrios / Emmanuel Kymakis / Emmanuel Stratakis / Minas M. Stylianakis

Journal of colloid and interface science. 2014 Sept. 15, v. 430

2014

Abstract	The dispersion behaviour of graphene oxide (GO) and chemically reduced GO (rGO) has been investigated in a wide range of organic solvents. The effect of the reduction process on the GO solubility in eighteen different solvents was examined and analysed, taking into consideration the solvent polarity, the surface tension and the Hansen and Hildebrand solubility parameters. rGO concentrations up to ∼9μg/mL in chlorinated solvents were achieved, demonstrating an efficient solubilization strategy, extending the scope for scalable liquid-phase processing of conductive rGO inks for the development of printed flexible electronics.
Keywords	electronics ; graphene oxide ; solubility ; solubilization ; solvents ; surface tension
Language	English
Dates of publication	2014-0915
Size	p. 108-112.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	241597-5
ISSN	1095-7103 ; 0021-9797
ISSN (online)	1095-7103
ISSN	0021-9797
DOI	10.1016/j.jcis.2014.05.033
Database	NAL-Catalogue (AGRICOLA)

In stock of ZB MED Bonn / Germany

Z 71/707: Show issues

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Details ▾
- See ZB MED holdings
- Order with fees

Article ; Online: Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells.

Cho, Kyung Taek / Grancini, Giulia / Lee, Yonghui / Konios, Dimitrios / Paek, Sanghyun / Kymakis, Emmanuel / Nazeeruddin, Mohammad Khaja

ChemSusChem

2016 Volume 9, Issue 21, Page(s) 3040–3044

Abstract: In this work we systematically investigated the role of reduced graphene oxide (rGO) in hybrid perovskite solar cells (PSCs). By mixing rGO within the mesoporous ... ...

Abstract	In this work we systematically investigated the role of reduced graphene oxide (rGO) in hybrid perovskite solar cells (PSCs). By mixing rGO within the mesoporous TiO
MeSH term(s)	Calcium Compounds ; Electron Transport ; Electrons ; Energy-Generating Resources ; Graphite/chemistry ; Oxides ; Solar Energy ; Titanium
Chemical Substances	Calcium Compounds ; Oxides ; perovskite (12194-71-7) ; Graphite (7782-42-5) ; Titanium (D1JT611TNE)
Language	English
Publishing date	2016-11-09
Publishing country	Germany
Document type	Journal Article
ISSN	1864-564X
ISSN (online)	1864-564X
DOI	10.1002/cssc.201601070
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article ; Online: Solution processed reduced graphene oxide electrodes for organic photovoltaics.

Petridis, Constantinos / Konios, Dimitrios / Stylianakis, Minas M / Kakavelakis, George / Sygletou, Maria / Savva, Kyriaki / Tzourmpakis, Pavlos / Krassas, Miron / Vaenas, Naoum / Stratakis, Emmanuel / Kymakis, Emmanuel

Nanoscale horizons

2016 Volume 1, Issue 5, Page(s) 375–382

Abstract: Since the isolation of free standing graphene in 2004, graphene research has experienced a phenomenal growth. Due to its exceptional electronic, optical and mechanical properties, graphene is believed to be the next wonder material for optoelectronics. ... ...

Abstract	Since the isolation of free standing graphene in 2004, graphene research has experienced a phenomenal growth. Due to its exceptional electronic, optical and mechanical properties, graphene is believed to be the next wonder material for optoelectronics. The enhanced electrical conductivity, combined with its high transparency in the visible and near-infrared regions of the spectrum, enabled graphene to be an ideal low cost indium-tin oxide (ITO) substitute. Solution-processed reduced graphene oxide combines the unique optoelectrical properties of graphene with large area deposition and flexible substrates rendering it compatible with roll-to-roll manufacturing methods. This paper provides an overview of recent research progress in the application and consequent physical-chemical properties of solution-processed reduced graphene oxide-based films as transparent conductive electrodes (TCEs) in organic photovoltaic (OPV) cells. Reduced graphene oxide (rGO) can be effectively utilized as the TCE in flexible OPVs, where the brittle and expensive ITO is incompatible. The prospects and future research trends in graphene-based TCEs are also discussed.
Language	English
Publishing date	2016-02-29
Publishing country	England
Document type	Journal Article
ISSN	2055-6764
ISSN (online)	2055-6764
DOI	10.1039/c5nh00089k
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top

More links

Kategorien

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

In stock of ZB MED Bonn / Germany

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED