APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

14 May 2012

Volume 100, Issue 20, Articles (20xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 100, 203104 (2012); http://dx.doi.org/10.1063/1.3701731 (4 pages)

Z. Y. Jiang, X. X. Jiang, S. Su, X. P. Wei, S. T. Lee, and Y. He
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds
FREE

Direct evidence of n-type doping in organic light-emitting devices: N free Cs doping from CsN3

Jeihyun Lee, Hyunbok Lee, Pyungeun Jeon, Kwangho Jeong, Tae Gun Kim, Jeong Won Kim, and Yeonjin Yi

Appl. Phys. Lett. 100, 203301 (2012); http://dx.doi.org/10.1063/1.4718017 (4 pages) | Cited 1 time

Online Publication Date: 14 May 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Cesium azide (CsN3) is confirmed to be decomposed during thermal evaporation. Only Cs could be deposited on tris(8-hydroxyquinolinato)aluminum (Alq3) and n-type doping is easily achieved. Organic light-emitting devices with CsN3 show highly improved current density-luminance-voltage characteristics compared to the control device without CsN3. To understand the origin of the improvements, in situ x-ray and UV photoemission spectroscopy measurements were carried out and a remarkable reduction in electron injection barrier is verified with successive deposition of Al on CsN3 on Alq3. CsN3 has a potential as alternative to doping the electron transport layer by replacing the direct deposition of alkali metals.
Show PACS
85.60.Jb Light-emitting devices
FREE

Modeling charge transfer at organic donor-acceptor semiconductor interfaces

Deniz Çakir, Menno Bokdam, Michel P. de Jong, Mats Fahlman, and Geert Brocks

Appl. Phys. Lett. 100, 203302 (2012); http://dx.doi.org/10.1063/1.4717985 (4 pages) | Cited 2 times

Online Publication Date: 15 May 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We develop an integer charge transfer model for the potential steps observed at interfaces between donor and acceptor molecular semiconductors. The potential step can be expressed as the difference between the Fermi energy pinning levels of electrons on the acceptor material and holes on the donor material, as determined from metal-organic semiconductor contacts. These pinning levels can be obtained from simple density functional theory calculations.
Show PACS
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
73.40.Ns Metal-nonmetal contacts
FREE

Red-green-blue polymer light-emitting diode pixels printed by optimized laser-induced forward transfer

James Shaw Stewart, Thomas Lippert, Matthias Nagel, Frank Nüesch, and Alexander Wokaun

Appl. Phys. Lett. 100, 203303 (2012); http://dx.doi.org/10.1063/1.4717463 (4 pages) | Cited 5 times

Online Publication Date: 15 May 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An optimized laser-induced forward transfer (LIFT) technique has been used to fabricate tri-color organic light-emitting diode (OLED) pixels. At reduced pressures, and with a defined donor-receiver gap, patterned depositions of polyfluorene-based OLED pixels have been achieved. OLED pixel functionality has been demonstrated and compared with devices made using conventional deposition techniques. In addition, improved functionality has been obtained by coating the cathode with an electron-injecting layer, a process not possible using conventional OLED fabrication techniques. The OLED pixels fabricated by LIFT reach efficiencies on the range of conventionally fabricated devices and even surpass them in the case of blue pixels.
Show PACS
85.60.Jb Light-emitting devices
82.45.Fk Electrodes
FREE

Efficiency enhancement for bulk heterojunction photovoltaic cells via incorporation of alcohol soluble conjugated polymer interlayer

Yu Chen, Zhitao Jiang, Mei Gao, Scott E. Watkins, Ping Lu, Haiqiao Wang, and Xiwen Chen

Appl. Phys. Lett. 100, 203304 (2012); http://dx.doi.org/10.1063/1.4719522 (5 pages) | Cited 3 times

Online Publication Date: 17 May 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Three dimensional conjugated polymers with pendant ionic ammoniums or polar amines and their linear analogues as cathode interfacial layers were used for organic photovoltaic cells based on blends of poly [(9,9-di-n-octyl-2,7-fluorene)-alt-(5,5-(4′,7′-di-2-thienyl)-2′,1′,3′-benzothiadiazole)] (PFOTBT) or poly(3-hexylthiophene) as the donor and [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) as the acceptor. The alcohol soluble conjugated polymer interlayers can improve the device performance significantly by simultaneous enhancements of the open-circuit voltage, short-circuit current density, and fill factor. An increase of the power conversion efficiency from 2.62% to 4.67% by 78% was observed with poly[(2,7,2′,7′-spirobifluorene-co-(9,9-bis(6′-((N,N,N-trimethyl) ammonium) hexyl)-2,7-fluorene) dibromide)] based on PFOTBT-PC61BM blend.
Show PACS
85.60.-q Optoelectronic devices
82.45.Fk Electrodes
82.45.Wx Polymers and organic materials in electrochemistry
82.47.-a Applied electrochemistry
FREE

Molecular orientation and anisotropic carrier mobility in poorly soluble polythiophene thin films

Yuki Hosokawa, Masahiro Misaki, Satoshi Yamamoto, Masafumi Torii, Kenji Ishida, and Yasukiyo Ueda

Appl. Phys. Lett. 100, 203305 (2012); http://dx.doi.org/10.1063/1.4718424 (4 pages) | Cited 2 times

Online Publication Date: 18 May 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Oriented thin films of a poorly soluble polythiophene, poly[benzo[1,2-d:4,5-d′]bisthiazole-2,6-diyl(3′,4,4″,4″′-tetradodecyl[2,2′:5′,2″:5″,2″′-quaterthiophene]-5,5″′-diyl)], were fabricated using the friction-transfer technique. The detail of the film structure was investigated using polarized UV-vis spectroscopy, transmission electron microscopy, and grazing-incidence x-ray diffraction observations. The friction-transfer technique enables control of the anisotropic carrier transport according to the face-on and/or edge-on molecular orientations in films with one-directionally aligned polymer backbones.
Show PACS
81.05.Lg Polymers and plastics; rubber; synthetic and natural fibers; organometallic and organic materials
78.66.Qn Polymers; organic compounds
78.40.Me Organic compounds and polymers
73.61.Ph Polymers; organic compounds
61.41.+e Polymers, elastomers, and plastics
FREE

Molecular control of photoexcited charge transfer and recombination at a quaterthiophene/zinc oxide interface

Weiwei Mou, Satoshi Ohmura, Fuyuki Shimojo, and Aiichiro Nakano

Appl. Phys. Lett. 100, 203306 (2012); http://dx.doi.org/10.1063/1.4719206 (5 pages) | Cited 3 times

Online Publication Date: 18 May 2012

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Nonadiabatic quantum molecular dynamics simulations are performed to study photoexcited charge transfer (CT) and charge recombination (CR) at an interface between a conjugated oligomer donor, quaterthiophene (QT), and an inorganic acceptor (ZnO). Simulations reveal a detrimental effect of static disorder in QT conformation on the efficiency of hybrid QT/ZnO solar cells due to increased CR. On the contrary, dynamic disorder (i.e., fluctuation of carbon-hydrogen bonds in QT) is essential for high efficiency by assisting CT. The separate controllability of CT and CR at the molecular level has impacts on molecular design for efficient solar cells and explains recent experimental observations.
Show PACS
88.40.H- Solar cells (photovoltaics)
71.15.Pd Molecular dynamics calculations (Car-Parrinello) and other numerical simulations
82.30.Fi Ion-molecule, ion-ion, and charge-transfer reactions
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close