scholarly journals From high quality packing to disordered nucleation or phase separation in donor/acceptor interfaces: ClAlPc-C60 on Au(111)

2021 ◽  
Author(s):  
Esther Barrena ◽  
Rogger Palacios-Rivera ◽  
José Ignacio Martínez ◽  
Carmen Ocal
Keyword(s):  
Phase Separation ◽  
High Quality ◽  
Donor Acceptor ◽  
Chloroaluminum Phthalocyanine

The dramatic consequences that the orientation adopted by the molecular dipoles, in diverse arrays of chloroaluminum phthalocyanine (ClAlPc) on Au(111), have on the ulterior adsorption and growth of C60 are...

scholarly journals Optical Activation Behavior of Ion Implanted Acceptor Species in GaN

2000 ◽  
Vol 5 (S1) ◽  
pp. 507-513 ◽  
Author(s):  
B.J. Skromme ◽  
G.L. Martinez
Keyword(s):  
Variable Temperature ◽  
Spectroscopic Properties ◽  
Acceptor Pair ◽  
High Quality ◽  
Shallow Acceptor ◽  
Implantation Damage ◽  
Donor Acceptor ◽  
Optical Activation ◽  
Optical Binding ◽  
Dose Dependent

Ion implantation is used to investigate the spectroscopic properties of Mg, Be, and C acceptors in GaN. Activation of these species is studied using low temperature photoluminescence (PL). Low dose implants into high quality undoped hydride vapor phase epitaxial (HVPE) material are used in conjunction with high temperature (1300 °C) rapid thermal anneals to obtain high quality spectra. Dramatic, dose-dependent evidence of Mg acceptor activation is observed without any co-implants, including a strong, sharp neutral Mg acceptor-bound exciton and strong donor-acceptor pair peaks. Variable temperature measurements reveal a band-to-acceptor transition, whose energy yields an optical binding energy of 224 meV. Be and C implants yield only slight evidence of shallow acceptor-related features and produce dose-correlated 2.2 eV PL, attributed to residual implantation damage. Their poor optical activation is tentatively attributed to insufficient vacancy production by these lighter ions. Clear evidence is obtained for donor-Zn acceptor pair and acceptor-bound exciton peaks in Zn-doped HVPE material.

Tuning the morphology of the active layer of organic solar cells by spin 1/2 radicals

2019 ◽  
Vol 43 (35) ◽  
pp. 13998-14008
Author(s):  
Yuancheng Qin ◽  
Manman Li ◽  
Yu Xie ◽  
Xue Li ◽  
Chunming Yang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Active Layer ◽  
Network Structure ◽  
Organic Solar Cells ◽  
Interpenetrating Network ◽  
Donor Acceptor

The morphology of the active layer, the formation of an interpenetrating network structure and the phase separation of donor–acceptor polymers has been improved by spin 1/2 radicals, and enhanced the PCEs of the organic solar cells.

GaN On 6H-SiC – Structural And Optical Properties

1994 ◽  
Vol 339 ◽  
Author(s):  
C. Wetzel ◽  
D. Volm ◽  
B. K. Meyer ◽  
K. Pressel ◽  
S. Nilsson ◽  
...  
Keyword(s):  
Optical Properties ◽  
Transition Metal Ions ◽  
Substrate Material ◽  
X Ray Diffraction ◽  
High Quality ◽  
Paramagnetic Resonance ◽  
Lattice Constants ◽  
Donor Acceptor ◽  
Related Donor

ABSTRACTRecent progress in the growth of high quality 6H-SiC single crystals has led to an ideal substrate material for GaN epitaxial films. Nearly matching lattice constants of wurzite GaN to 6H-SiC in the hexagonal plane can reduce strain effects at the interface. We employed the sublimation sandwich method to grow single crystal layers at reasonable growth rates with free carrier concentrations of 2×1017 cm-3. Very sharp x-ray diffraction peaks of the GaN (0002) plane are obtained indicating the high quality of this system (Δ(2θ) < 0.1 degrees). These findings are directly reflected in the optical properties. The photoluminescence is dominated by a single sharp exciton line, impurity related donor acceptor transitions are seen with very weak intensities. However, at lower energies the internal luminescence transitions of the 3d transition metal ions Fe and V are observable. The incorporation of Fe is confirmed by electron paramagnetic resonance.

Electrospinning as a Versatile Method of Composite Thin Films Fabrication for Selected Applications

2019 ◽  
Vol 293 ◽  
pp. 35-49 ◽  
Author(s):  
Wiktor Matysiak ◽  
Tomasz Tański ◽  
Weronika Smok
Keyword(s):  
Thin Films ◽  
Phase Separation ◽  
Physicochemical Properties ◽  
Template Synthesis ◽  
Self Assembly ◽  
Textile Industry ◽  
Separation Method ◽  
Common Method ◽  
High Quality ◽  
Composite Thin Films

Today, one of the most popular nanomaterials are thin nanofibrous layers, which are used in many fields of industry, eg electronics, optics, filtration and the textile industry. They can be produced by various methods, such as drawing, template synthesis, molecular self-assembly or phase separation method, but the most common method is electrospinning from a solution or melts. Electrospinning is gaining more and more interest due to its versatility, simplicity and economy as well as the possibility of producing fibers from various types of polymeric, ceramic and metalic materials. Nanofibrous layers produced by this method are characterized by high quality and the desired physicochemical properties.

Functionalizing benzothiadiazole with non-conjugating ester groups as side chains in a donor–acceptor polymer improves solar cell performance

2019 ◽  
Vol 43 (10) ◽  
pp. 4242-4252
Author(s):  
Radhakrishna Ratha ◽  
Mohammad Adil Afroz ◽  
Ritesh Kant Gupta ◽  
Parameswar Krishnan Iyer
Keyword(s):  
Phase Separation ◽  
Solar Cell ◽  
Conjugated Polymers ◽  
Active Layer ◽  
Polymer Solar Cell ◽  
Bulk Heterojunction ◽  
Side Chain ◽  
Solar Cell Performance ◽  
Donor Acceptor ◽  
Chain Ester

Side chain ester substitution on donor–acceptor based conjugated polymers used as solar harvesters in a bulk-heterojunction (BHJ) polymer solar cell (PSC) can improve harvesting properties, phase separation in the active layer and PSC performance.

scholarly journals Appropriate Donor-Acceptor Phase Separation Structure for the Enhancement of Charge Generation and Transport in Polymer Solar Cells

Polymers ◽  
2018 ◽  
Vol 10 (3) ◽  
pp. 332 ◽  
Author(s):  
Dayong Zhang ◽  
Rong Hu ◽  
Jiang Cheng ◽  
Yuqiang Chang ◽  
Mingming Huo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Polymer Solar Cells ◽  
Charge Generation ◽  
Donor Acceptor ◽  
Acceptor Phase

High quality p-type ZnO film grown on ZnO substrate by nitrogen and tellurium co-doping

2009 ◽  
Vol 1201 ◽  
Author(s):  
Seunghwan Park ◽  
Tsutomu Minegishi ◽  
jinsub Park ◽  
Hyunjae Lee ◽  
Toshinori Taishi ◽  
...  
Keyword(s):  
Electron Concentration ◽  
Hole Concentration ◽  
Nitrogen Concentration ◽  
Zno Film ◽  
Acceptor Pair ◽  
High Quality ◽  
Co Doping ◽  
Donor Acceptor ◽  
Doped Zno ◽  
P Type

AbstractNitrogen and tellurium co-doped ZnO (ZnO:[N+Te]) films have been grown on (0001) ZnO substrate by plasma-assisted molecular beam epitaxy. The electron concentration of tellurium doped ZnO (ZnO:Te) gradually increases, compared that of undoped ZnO (u-ZnO). On the other hand, conductivity of ZnO:[N+Te] changes from n-type to p-type characteristic with a hole concentration of 4×1016 cm-3. However, nitrogen doped ZnO film (ZnO:N) still remain as n-type conductivity with a electron concentration of 2.5×1017 cm-3. Secondary ion mass spectroscopy reveals that nitrogen concentration ([N]) of ZnO:[N+Te] film (2×1021 cm-3) is relatively higher than that of ZnO:N film (3×1020 cm-3). 10 K photoluminescence spectra shows that considerable improvement of emission properties of ZnO:[N+Te] with an emergence of narrow acceptor bound exciton (A°X, 3.359 eV) and donor-acceptor pair (DAP, 3.217 eV), compared with those of u-ZnO. Consequently, high quality p-type ZnO with high N concentration is realized by using Te and N co-doping technique due to reduction of Madelung energy.

Relaxed, high-quality InP on GaAs by using InGaAs and InGaP graded buffers to avoid phase separation

2007 ◽  
Vol 102 (3) ◽  
pp. 033511 ◽  
Author(s):  
Nathaniel J. Quitoriano ◽  
Eugene A. Fitzgerald
Keyword(s):  
Phase Separation ◽  
High Quality

scholarly journals Graded vertical phase separation of donor/acceptor species for polymer solar cells

2012 ◽  
Vol 100 ◽  
pp. 147-152 ◽  
Author(s):  
Anna Loiudice ◽  
Aurora Rizzo ◽  
Gianluca Latini ◽  
Concetta Nobile ◽  
Milena de Giorgi ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Polymer Solar Cells ◽  
Donor Acceptor
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