Effect of substitution group variation on the optical functions of -5-sulfono-7-(4-x phenyl azo)-8-hydroxy quinoline thin films

2013 ◽  
Vol 13 (9) ◽  
pp. 1960-1966 ◽  
Author(s):  
H.M. Zeyada ◽  
N.A. El-Ghamaz ◽  
E.A. Gaml
Keyword(s):  
Thin Films ◽  
Optical Functions ◽  
Group Variation ◽  
Hydroxy Quinoline ◽  
Substitution Group

Molecular Multilayer Organic Solar Cells with Large Excitonic Diffusion Length

2006 ◽  
Vol 965 ◽  
Author(s):  
Seunghyup Yoo ◽  
William J Potscavage ◽  
Benoit Domercq ◽  
Sung-Ho Han ◽  
Dean Levi ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Performance Improvement ◽  
Organic Solar Cells ◽  
Diffusion Length ◽  
Collection Efficiency ◽  
Blocking Layer ◽  
Photovoltaic Properties ◽  
Optical Functions ◽  
Carrier Collection

ABSTRACTWe report on the photovoltaic properties of organic solar cells based on pentacene and C60 thin films. A peak external quantum efficiency (EQE) of 69 % at a wavelength of λ = 668 nm is achieved upon optimization of the exciton blocking layer (EBL) thickness. Complex optical functions of pentacene films are measured as a function of wavelength by spectroscopic ellipsometry and used to analyze the EQE spectra. Detailed analysis of the EQE spectra indicate that the pentacene layers exhibit large excitonic diffusion lengths of ∼70 nm and that the performance improvement in EQE can be attributed to the influence of the thickness of the EBL layer on the carrier collection efficiency.

Optical functions of Ca-modified PbTiO3 thin films determined by spectroscopic ellipsometry

2000 ◽  
Vol 114 (6) ◽  
pp. 347-350 ◽  
Author(s):  
H Li ◽  
X Tang ◽  
Q Li ◽  
Y Liu ◽  
Z Tang ◽  
...  
Keyword(s):  
Thin Films ◽  
Spectroscopic Ellipsometry ◽  
Optical Functions

The characterization of the optical functions of BCP and CBP thin films by spectroscopic ellipsometry

2005 ◽  
Vol 150 (2) ◽  
pp. 159-163 ◽  
Author(s):  
Z.T. Liu ◽  
C.Y. Kwong ◽  
C.H. Cheung ◽  
A.B. Djurišić ◽  
Y. Chan ◽  
...  
Keyword(s):  
Thin Films ◽  
Spectroscopic Ellipsometry ◽  
Optical Functions

Effect of substitution group on dielectric properties of 4H-pyrano [3, 2-c] quinoline derivatives thin films

2016 ◽  
Vol 25 (7) ◽  
pp. 077701 ◽  
Author(s):  
H M Zeyada ◽  
F M El-Taweel ◽  
M M El-Nahass ◽  
M M El-Shabaan
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Quinoline Derivatives ◽  
Substitution Group

scholarly journals Investigations of Different Phases Responsible for Changes in Optical Properties of Organic Semiconducting Device Material Thin Films

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Vivek Kumar Shukla ◽  
Jaya Maitra
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Organic Semiconductors ◽  
Green Light ◽  
Green Emission ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Deposition Parameters ◽  
Hydroxy Quinoline ◽  
Deposited Films

The environment sensitivity of organic semiconductors may change their molecular structure and hence optical properties. Exploiting this concept, experiments were performed on a green light emitting material bis(8-hydroxy quinoline)Zinc, (Znq2) used in organic light emitting diodes (OLEDs). Thin films were deposited at varying deposition parameters, and their properties were compared. We investigated that as deposited films have a significant component of Znq2 tetramer out of two known forms, that is, dihydrate and anhydrous tetramer (Znq2)4, the films deposited at lower deposition rates have higher anhydrous content. The degradation of thin film is shown, that changes the optical properties of film from green emission to blue which may be due to water adsorption and crystallization.

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