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

7 Mar 2011

Volume 98, Issue 10, Articles (10xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 98, 104101 (2011); http://dx.doi.org/10.1063/1.3560505 (3 pages)

Zhongchang Wang, Susumu Tsukimoto, Rong Sun, Mitsuhiro Saito, and Yuichi Ikuhara
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds
FREE

Pure anatase TiO2 “nanoglue”: An inorganic binding agent to improve nanoparticle interconnections in the low-temperature sintering of dye-sensitized solar cells

Yuelong Li, Wonjoo Lee, Doh-Kwon Lee, Kyungkon Kim, Nam-Gyu Park, and Min Jae Ko

Appl. Phys. Lett. 98, 103301 (2011); http://dx.doi.org/10.1063/1.3562030 (3 pages) | Cited 8 times

Online Publication Date: 8 March 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
An interparticle-binding agent, or “nanoglue,” was prepared for the fabrication of well-interconnected TiO2 photoelectrodes in dye-sensitized solar cells (DSSCs) sintered at low temperature. This nanoglue consisted of pure anatase particles approximately 5 nm in diameter dispersed in alcoholic solvent. When mixed with TiO2 particles 21 nm in diameter, the nanoglue induced interparticle chemical bridging via the condensation of hydroxyl groups on surfaces of TiO2 particles. The efficiency of nanoglue-based DSSCs was improved by approximately 25% compared to non-nanoglue-based DSSCs. This improvement was mainly ascribed to enhanced interparticle connections due to the presence of the 5 nm TiO2 particles in nanoglue.
Show PACS
88.40.H- Solar cells (photovoltaics)
88.40.J- Types of solar cells
61.46.Df Structure of nanocrystals and nanoparticles ("colloidal" quantum dots but not gate-isolated embedded quantum dots)
81.20.Ev Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
82.45.Fk Electrodes
FREE

Bulk mobility of polycrystalline thin films of quaterthiophene derivatives

Kyohei Nakano, Hiroaki Iino, Takayuki Usui, and Jun-ichi Hanna

Appl. Phys. Lett. 98, 103302 (2011); http://dx.doi.org/10.1063/1.3555435 (3 pages) | Cited 1 time

Online Publication Date: 8 March 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Although polycrystalline thin films of organic materials are applied for organic field effect transistors, their bulk electrical properties have not been characterized. In this study, we investigated hole transport properties in the polycrystalline thin films of a series of quaterthiophene derivatives by both time-of-flight experiments and field effect measurements. The time-of-flight bulk mobility was almost same or smaller than field effect mobility. Both mobilities showed a similar trend as a function of side chain length. We discussed these results from the view point of the intrinsic nature of quaterthiophenes, which gave a fundamental knowledge of charge transport properties in the organic polycrystalline thin films.
Show PACS
73.61.Ph Polymers; organic compounds
73.50.Dn Low-field transport and mobility; piezoresistance
FREE

Molecular control of pentacene/ZnO photoinduced charge transfer

Josef W. Spalenka, Peerasak Paoprasert, Ryan Franking, Robert J. Hamers, Padma Gopalan, and Paul G. Evans

Appl. Phys. Lett. 98, 103303 (2011); http://dx.doi.org/10.1063/1.3560481 (3 pages) | Cited 3 times

Online Publication Date: 9 March 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Photoinduced charge transfer modifies the device properties of illuminated pentacene field effect transistors (FETs) incorporating ZnO quantum dots at the gate insulator/pentacene interface. The transferred charge is trapped on electronic states associated with the ZnO quantum dots, with a steady state population approximately proportional to the rate of organic-inorganic charge transfer. Trapped charge shifts the threshold voltage of the FETs, providing the means to evaluate the rate of organic/inorganic charge transfer and the effects of interface modification. Monolayers of the wide-gap alkane stearic acid and the conjugated oligomer terthiophene attached to the ZnO suppress or permit charge transfer, respectively.
Show PACS
85.30.Tv Field effect devices
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
73.63.Kv Quantum dots
73.21.La Quantum dots
73.20.-r Electron states at surfaces and interfaces
FREE

DNA biopolymer conductive cladding for polymer electro-optic waveguide modulators

Emily M. Heckman, Roberto S. Aga, Adam T. Rossbach, Brian A. Telek, Carrie M. Bartsch, and James G. Grote

Appl. Phys. Lett. 98, 103304 (2011); http://dx.doi.org/10.1063/1.3562953 (3 pages) | Cited 4 times

Online Publication Date: 10 March 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A deoxyribonucleic acid (DNA) biopolymer has been studied for use as a conductive cladding layer in polymer electro-optic (EO) waveguide modulators due to its low optical loss and high electrical conductivity relative to its inorganic polymer counterparts. Electric field contact poling measurements using a DNA biopolymer cladding layer with an amorphous polycarbonate/chromophore (APC/CLD1) guest-host system core layer have been made and compared to a UV15 cladding layer. Using the EO coefficient of APC/CLD1 with no cladding layer as a baseline, the DNA biopolymer cladding layer yielded relative poling efficiencies of 96% while the UV15 poling efficiencies were only 51%.
Show PACS
42.79.Hp Optical processors, correlators, and modulators
42.79.Gn Optical waveguides and couplers
42.79.Wc Optical coatings
42.70.Jk Polymers and organics
85.65.+h Molecular electronic devices
FREE

Thickness dependence of the MoO3 blocking layers on ZnO nanorod-inverted organic photovoltaic devices

Mingjun Wang, Yuan Li, Huihui Huang, Eric D. Peterson, Wanyi Nie, Wei Zhou, Wei Zeng, Wenxiao Huang, Guojia Fang, Nanhai Sun, Xingzhong Zhao, and David L. Carroll

Appl. Phys. Lett. 98, 103305 (2011); http://dx.doi.org/10.1063/1.3554381 (3 pages) | Cited 11 times

Online Publication Date: 10 March 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Organic solar cells based on vertically aligned zinc oxide nanorod arrays (ZNR) in an inverted structure of indium tin oxide (ITO)/ZNR/poly(3-hexylthiophene): (6,6)-phenyl C61 butyric acid methyl ester(P3HT:PCBM)/MoO3/aluminum(Al) were studied. We found that the optimum MoO3 layer thickness condition of 20 nm, the MoO3 can effectively decrease the probability of bimolecular recombination either at the Al interface or within the active layer itself. For this optimum condition we get a power conversion efficiency of 2.15%, a short-circuit current density of 9.02 mA/cm2, an open-circuit voltage of 0.55V, and a fill factor of 0.44 under 100 mW/cm2 irradiation. Our investigations also show that the highly crystallized ZNR can create short and continuous pathways for electron transport and increase the contact area between the ZNR and the organic materials.
Show PACS
88.40.jr Organic photovoltaics
FREE

Flexible multilayer inverted polymer light-emitting diodes with a gravure contact printed Cs2CO3 electron injection layer

Dae-Young Chung, Dong-Seok Leem, Donal D. C. Bradley, and Alasdair J. Campbell

Appl. Phys. Lett. 98, 103306 (2011); http://dx.doi.org/10.1063/1.3560484 (3 pages) | Cited 2 times

Online Publication Date: 10 March 2011

Full Text: Read Online (HTML) | Download PDF

Show Abstract
Here we demonstrate high efficiency, flexible inverted polymer light-emitting diodes in which the bottom-contact cesium carbonate electron injection layer is gravure contact printed. The poly(9,9-dioctylfluorene-alt-benzothiadiazole) emissive/electron transport layer, the poly(9,9-dioctylfluorene-alt-N-(4-butylphenyl)-diphenylamine) hole transport/electron blocking layer and the poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) hole injection layer were sequentially spin-coated from solution using orthogonal solvent formulations with appropriate wetting properties. By switching from indium-tin-oxide (ITO) on glass to ITO on poly(ethylene terephthalate) and using gravure contact printing instead of spin-coating, Cs2CO3 smoothness and morphology was optimized, resulting in an approximately fivefold increase in current efficiency and power efficiency at 100 cd/m2.
Show PACS
85.60.Jb Light-emitting devices
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close