Electronic structure and molecular design of simplified polyimide systems

1992 ◽  
Vol 1 (4) ◽  
Author(s):  
Keizo Nakajima ◽  
Kazuyoshi Tanaka ◽  
Tokio Yamabe
Keyword(s):  
Electronic Structure ◽  
Molecular Design

Structurally-modified subphthalocyanines: molecular design towards realization of expected properties from the electronic structure and structural features of subphthalocyanine

2014 ◽  
Vol 50 (53) ◽  
pp. 6949-6966 ◽  
Author(s):  
Soji Shimizu ◽  
Nagao Kobayashi
Keyword(s):  
Electronic Structure ◽  
Molecular Design ◽  
Structural Features ◽  
Feature Article ◽  
System 2

This feature article summarizes recent contributions of the authors in the synthesis of structurally-modified subphthalocyanines, which covers (1) modification of the conjugated system, (2) core-modification, and (3) exterior-modification.

A simple molecular design for tunable two-dimensional imine covalent organic frameworks for optoelectronic applications

2020 ◽  
Vol 22 (37) ◽  
pp. 21360-21368
Author(s):  
Vivek K. Yadav ◽  
Showkat H. Mir ◽  
Vipin Mishra ◽  
Thiruvancheril G. Gopakumar ◽  
Jayant K. Singh
Keyword(s):  
Electronic Structure ◽  
Work Function ◽  
Carrier Mobility ◽  
Molecular Design ◽  
Optoelectronic Properties ◽  
Two Dimensional ◽  
Covalent Organic Frameworks ◽  
Semiconducting Materials ◽  
Optoelectronic Applications

We systematically study the electronic structure, carrier mobility and work function of imine based 2D-COFs. The bandgaps of these semiconducting materials can be tailored by doping with nitrogen for tunable electronic/optoelectronic properties.

Electronic Structure of Covalently Linked Zinc Bacteriochlorin Molecular Arrays: Insights into Molecular Design for NIR Light Harvesting

2014 ◽  
Vol 118 (42) ◽  
pp. 9901-9913 ◽  
Author(s):  
Kushal Shrestha ◽  
Jessica M. González-Delgado ◽  
James H. Blew ◽  
Elena Jakubikova
Keyword(s):  
Electronic Structure ◽  
Light Harvesting ◽  
Molecular Design ◽  
Nir Light ◽  
Covalently Linked

Molecular design for tuning electronic structure of π-conjugated polymers containing fused dithienobenzimidazole units

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 191-199 ◽  
Author(s):  
Koji Takagi ◽  
Tomoharu Kuroda ◽  
Masanori Sakaida ◽  
Hyuma Masu
Keyword(s):  
Electronic Structure ◽  
Conjugated Polymers ◽  
Molecular Design

EELS Measurement of the Local Electronic Structure of Copper Atoms Segregated to Aluminum Grain Boundaries

1996 ◽  
Vol 54 ◽  
pp. 342-343
Author(s):  
S.J. Splinter ◽  
J. Bruley ◽  
P.E. Batson ◽  
D.A. Smith ◽  
R. Rosenberg
Keyword(s):  
Electronic Structure ◽  
Grain Boundaries ◽  
Boundary Segregation ◽  
Thin Layers ◽  
Nominal Composition ◽  
Spatially Resolved ◽  
Service Lifetime ◽  
Heat Treated ◽  
Probe Size ◽  
Local Electronic Structure

It has long been known that the addition of Cu to Al interconnects improves the resistance to electromigration failure. It is generally accepted that this improvement is the result of Cu segregation to Al grain boundaries. The exact mechanism by which segregated Cu increases service lifetime is not understood, although it has been suggested that the formation of thin layers of θ-CuA12 (or some metastable substoichiometric precursor, θ’ or θ”) at the boundaries may be necessary. This paper reports measurements of the local electronic structure of Cu atoms segregated to Al grain boundaries using spatially resolved EELS in a UHV STEM. It is shown that segregated Cu exists in a chemical environment similar to that of Cu atoms in bulk θ-phase precipitates.Films of 100 nm thickness and nominal composition Al-2.5wt%Cu were deposited by sputtering from alloy targets onto NaCl substrates. The samples were solution heat treated at 748K for 30 min and aged at 523K for 4 h to promote equilibrium grain boundary segregation. EELS measurements were made using a Gatan 666 PEELS spectrometer interfaced to a VG HB501 STEM operating at 100 keV. The probe size was estimated to be 1 nm FWHM. Grain boundaries with the narrowest projected width were chosen for analysis. EDX measurements of Cu segregation were made using a VG HB603 STEM.

Electronic structure studies of conducting polymers by electron energy-loss spectroscopy

1996 ◽  
Vol 54 ◽  
pp. 160-161
Author(s):  
J. Fink
Keyword(s):  
Electronic Structure ◽  
Conducting Polymers ◽  
Conjugated Polymers ◽  
Electron Acceptors ◽  
Electron Donors ◽  
Light Emitting ◽  
One Dimensional ◽  
New Class ◽  
Electrical Conductivities ◽  
Electron Energy Loss

Conducting polymers comprises a new class of materials achieving electrical conductivities which rival those of the best metals. The parent compounds (conjugated polymers) are quasi-one-dimensional semiconductors. These polymers can be doped by electron acceptors or electron donors. The prototype of these materials is polyacetylene (PA). There are various other conjugated polymers such as polyparaphenylene, polyphenylenevinylene, polypoyrrole or polythiophene. The doped systems, i.e. the conducting polymers, have intersting potential technological applications such as replacement of conventional metals in electronic shielding and antistatic equipment, rechargable batteries, and flexible light emitting diodes.Although these systems have been investigated almost 20 years, the electronic structure of the doped metallic systems is not clear and even the reason for the gap in undoped semiconducting systems is under discussion.

Sign in / Sign up

Export Citation Format

Share Document