scholarly journals Synthesis and Investigation of the Properties of Organic-Inorganic Perovskite Films with Non-Contact Methods

2021 ◽  
Vol 66 (5) ◽  
pp. 429
Author(s):  
V.P. Kostylyov ◽  
A.V. Sachenko ◽  
V.M. Vlasiuk ◽  
I.O. Sokolovskyi ◽  
S.D. Kobylianska ◽  
...  
Keyword(s):  
Diffusion Length ◽  
Spectral Characteristics ◽  
Surface Photovoltage ◽  
Contact Method ◽  
Small Signal ◽  
Transmission Method ◽  
Cell Parameters ◽  
Photoelectric Properties ◽  
Coating Method ◽  
Minority Carriers

We present the results of studies of the photoelectric properties of perovskite CH3NH3PbI2.98Cl0.02 films deposited on a glass substrate using the spin-coating method. The unit cell parameters of perovskite are determined, by using X-ray diff ractometry. It is shown that the fi lm morphology represents a net of non-oriented needle-like structures with significant roughness and porosity. In order to investigate the properties of the films obtained, we used non-contact methods such as transmission and reflection measurements and the measurements of the spectral characteristics of the small-signal surface photovoltage. The non-contact method of spectral characteristics of the small-signal surface photovoltage and the transmission method reveal information about the external quantum yield in the films studied and about the diffusion length of minority carriers in the perovskite films. As a result of this analysis, it has been established that the films are naturally textured, and their bandgap is 1.59 eV. It is shown that, in order to correctly determine the absorption coefficient and the bandgap values, the Urbach effect should be accounted for. The diffusion length of minority carriers is longer than the fi lm thickness, which is equal to 400 nm. The films obtained are promising materials for solar cells and optoelectronic devices.

scholarly journals Diamine vapor treatment of viscoelastic graphene oxide liquid crystal for gas barrier coating

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seung Eun Choi ◽  
Sung-Soo Kim ◽  
Eunji Choi ◽  
Ji Hoon Kim ◽  
Yunkyu Choi ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Liquid Crystal ◽  
Diffusion Length ◽  
Barrier Properties ◽  
Gas Barrier ◽  
Barrier Coating ◽  
Coating Method ◽  
Gas Molecules ◽  
Pet Film ◽  
Vapor Treatment

AbstractA layered graphene oxide/ethylenediamine (GO/EDA) composite film was developed by exposing aqueous GO liquid crystal (GOLC) coating to EDA vapor and its effects on the gas barrier performance of GO film were systematically investigated. When a GO/EDA coating with a thickness of approximately 1 μm was applied to a neat polyethylene terephthalate (PET) film, the resultant film was highly impermeable to gas molecules, particularly reducing the gas permeance up to 99.6% for He and 98.5% for H2 in comparison to the neat PET film. The gas barrier properties can be attributed to the long diffusion length through stacked GO nanosheets. The EDA can crosslink oxygen-containing groups of GO, enhancing the mechanical properties of the GO/EDA coating with hardness and elastic modulus values up to 1.14 and 28.7 GPa, respectively. By the synergistic effect of the viscoelastic properties of GOLC and the volatility of EDA, this coating method can be applied to complex geometries and EDA intercalation can be spontaneously achieved through the scaffold of the GOLC.

Self-assembled synthesis and surface photovoltage properties of polyhedron-constructed micrometer solid sphere and hollow-sphere In2S3

RSC Advances ◽  
2014 ◽  
Vol 4 (33) ◽  
pp. 17245-17248 ◽  
Author(s):  
Yan Shi ◽  
Yu-Lin Yang ◽  
Rui-Qing Fan ◽  
Liang Li ◽  
Jia Yu ◽  
...  
Keyword(s):  
Hollow Sphere ◽  
Solid Sphere ◽  
Surface Photovoltage ◽  
Photoelectric Properties ◽  
Self Assembled

Novel solid/hollow-sphere In2S3 materials composed of polyhedra have been synthesized, and their photoelectric properties were investigated by SPS.

Determination of the diffusion length of the minority carriers in electron-beam-excited n-type GaAs

1971 ◽  
Vol 4 (1) ◽  
pp. 249-255 ◽  
Author(s):  
S. Rakshit ◽  
S. N. Biswas ◽  
A. N. Chakravarti
Keyword(s):  
Electron Beam ◽  
Diffusion Length ◽  
Minority Carriers

Influence of interstitial copper on diffusion length and lifetime of minority carriers in p-type silicon

1997 ◽  
Vol 71 (15) ◽  
pp. 2121-2123 ◽  
Author(s):  
A. A. Istratov ◽  
C. Flink ◽  
H. Hieslmair ◽  
T. Heiser ◽  
E. R. Weber
Keyword(s):  
Diffusion Length ◽  
Type Silicon ◽  
P Type ◽  
Minority Carriers

Exciton diffusion length in some thermocleavable polythiophenes by the surface photovoltage method

2012 ◽  
Vol 161 (23-24) ◽  
pp. 2727-2731 ◽  
Author(s):  
J. Toušek ◽  
J. Toušková ◽  
Z. Remeš ◽  
J. Kousal ◽  
S.A. Gevorgyan ◽  
...  
Keyword(s):  
Diffusion Length ◽  
Surface Photovoltage ◽  
Exciton Diffusion ◽  
Exciton Diffusion Length

Application de la méthode photonique à la détermination des paramètres physiques d'une cellule solaire monocristalline

2002 ◽  
Vol 80 (7) ◽  
pp. 733-743 ◽  
Author(s):  
M Ben Amar ◽  
A Ben Arab
Keyword(s):  
Solar Cell ◽  
Silicon Solar Cell ◽  
Diffusion Length ◽  
Optical Absorption Coefficient ◽  
Physical Parameters ◽  
Base Region ◽  
Technological Parameters ◽  
Base Thickness ◽  
Modulated Light ◽  
Minority Carriers

The photonic's method is used in the study of monocristalline silicon solar cell (N+P). The induced photocurrent in the cell is analyzed with respect to the technological parameters such as the optical absorption coefficient of silicon and the emitter and base thickness. The spatial and frequential variations of the photocurrent of the cell, when the latter is illuminated by a sinusoidal modulated light, allow access to the diffusion length and lifetime of the minority carriers generated in a given region of the cell. In this paper, the physical parameters related to the base region are determined. In addition, this access is shown to be possible only when the total photocurrent of the cell is reduced to the base diffusion photocurrent.

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