scholarly journals Analysis, Synthesis and Characterization of Thin Films of a-Si:H (n-type and p-type) Deposited by PECVD for Solar Cell Applications

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6349
Author(s):  
Abel Garcia-Barrientos ◽  
Jose Luis Bernal-Ponce ◽  
Jairo Plaza-Castillo ◽  
Alberto Cuevas-Salgado ◽  
Ariosto Medina-Flores ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Optical Band Gap ◽  
Synthesis And Characterization ◽  
Force Microscopy ◽  
The Third ◽  
Atomic Force ◽  
Uv Visible ◽  
P Type

In this paper, the analysis, synthesis and characterization of thin films of a-Si:H deposited by PECVD were carried out. Three types of films were deposited: In the first series (00 process), an intrinsic a-Si:H film was doped. In the second series (A1–A5 process), n-type samples were doped, and to carry this out, a gas mixture of silane (SiH4), dihydrogen (H2) and phosphine (PH3) was used. In the third series (B1–B5 process), p-type samples were doped using a mixture of silane (SiH4), dihydrogen (H2) and diborane (B2H6). The films’ surface morphology was characterized by atomic force microscopy (AFM), while the analysis of the films was performed by scanning electron microscopy (SEM), and UV–visible ellipsometry was used to obtain the optical band gap and film thickness. According to the results of the present study, it can be concluded that the best conditions can be obtained when the flow of dopant gases (phosphine or diborane) increases, as seen in the conductivity graphs, where the films with the highest flow of dopant gas reached the highest conductivities compared to the minimum required for materials made of a-Si:H silicon for high-quality solar cells. It can be concluded from the results that the magnitude of the conductivity, which increased by several orders, represents an important result, since we could improve the efficiency of solar cells based on a-Si:H.

Microscopic Characterizations of Nanostructured Silicon Thin Films for Solar Cells

2011 ◽  
Vol 1321 ◽  
Author(s):  
Antonín Fejfar ◽  
Petr Klapetek ◽  
Jakub Zlámal ◽  
Aliaksei Vetushka ◽  
Martin Ledinský ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Maxwell Equations ◽  
Amorphous Matrix ◽  
Optical Power ◽  
Conductive Atomic Force Microscopy ◽  
Force Microscopy ◽  
Silicon Thin Films ◽  
Atomic Force

ABSTRACTMicroscopic characterization of mixed phase silicon thin films by conductive atomic force microscopy (C-AFM) was used to study the structure composed of conical microcrystalline grains dispersed in amorphous matrix. C-AFM experiments were interpreted using simulations of electric field and current distributions. Density of absorbed optical power was calculated by numerically solving the Maxwell equations. The goal of this study is to combine both models in order to simulate local photoconductivity for understanding the charge photogeneration and collection in nanostructured solar cells.

FABRICATION AND OPTICAL AND MORPHOLOGICAL CHARACTERIZATION OF n+-ZnO/i-ZnO AND n+-ZnO/ZnSe BILAYERS USED AS OPTICAL WINDOWS IN SOLAR CELLS

2002 ◽  
Vol 09 (05n06) ◽  
pp. 1617-1621
Author(s):  
C. CALDERÓN ◽  
H. INFANTE ◽  
G. GORDILLO
Keyword(s):  
Thin Films ◽  
Atomic Force Microscopy ◽  
Solar Cells ◽  
Morphological Characterization ◽  
Morphological Properties ◽  
Spectral Transmittance ◽  
Optical Window ◽  
Force Microscopy ◽  
Atomic Force

This work presents results concerning the development of n +- ZnO/i-ZnO and n +- ZnO/ZnSe bilayer structures with adequate properties to be used as optical windows in solar cells based on CuInSe 2 thin films. The optical and morphological properties of each of the layers constituting the bilayer structures were studied through spectral transmittance and atomic force microscopy (AFM) measurements. The studies revealed that windows of this type allow a significant increase of the spectral range of absorbed radiation by the solar cell in comparison with those using ZnO/CdS as optical window.

Synthesis and Characterization of Semiconductor Composites Gas Sensors Based on ZnO Doped TiO2 Thin Films by Laser-Induced Plasma

2021 ◽  
Vol 900 ◽  
pp. 112-120
Author(s):  
Souad G. Khalil ◽  
Mahdi M. Mutter
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Operating Temperature ◽  
Electrical Characterization ◽  
X Ray Diffraction ◽  
Type Conductivity ◽  
Force Microscopy ◽  
Atomic Force ◽  
P Type

This work presents the development of n-type (TiO2) and p-type (ZnO) gas-sensitive materials from ZnO doped TiO2 thin films prepared by pulsed laser deposition technique (PLD) on a glass substrate as a gas sensor of CO2 gas. TiO2 gas-sensing layers have been deposited over a range of ZnO content (0, 20, and 40) wt %. The obtained thin films analysis by atomic force microscopy (AFM), and X-ray diffraction (XRD). Electrical characterization shows that TiO2:ZnO thin films were p-type conductivity and ZnO added was unable to change the composition to the n-type conductivity. There are notable gas-sensing response differences between n-type and p-type ZnO doped TiO2 thin film. The responses toward all tested oxidizing gases tend to increase with operating temperature for the n-type TiO2 films. Besides, the p-type ZnO doping results in a significant response improvement toward tested oxidizing gases such as CO2 gas at the low operating temperature of 60 °C.

scholarly journals The Physicochemical and Antibacterial Properties of Chitosan-Based Materials Modified with Phenolic Acids Irradiated by UVC Light

2021 ◽  
Vol 22 (12) ◽  
pp. 6472
Author(s):  
Beata Kaczmarek-Szczepańska ◽  
Marcin Wekwejt ◽  
Olha Mazur ◽  
Lidia Zasada ◽  
Anna Pałubicka ◽  
...  
Keyword(s):  
Thin Films ◽  
Antimicrobial Activity ◽  
Ferulic Acid ◽  
Phenolic Acid ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Force Microscopy ◽  
Atomic Force ◽  
Before And After

This paper concerns the physicochemical properties of chitosan/phenolic acid thin films irradiated by ultraviolet radiation with wavelengths between 200 and 290 nm (UVC) light. We investigated the preparation and characterization of thin films based on chitosan (CTS) with tannic (TA), caffeic (CA) and ferulic acid (FA) addition as potential food-packaging materials. Such materials were then exposed to the UVC light (254 nm) for 1 and 2 h to perform the sterilization process. Different properties of thin films before and after irradiation were determined by various methods such as Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), differential scanning calorimeter (DSC), mechanical properties and by the surface free energy determination. Moreover, the antimicrobial activity of the films and their potential to reduce the risk of contamination was assessed. The results showed that the phenolic acid improving properties of chitosan-based films, short UVC radiation may be used as sterilization method for those films, and also that the addition of ferulic acid obtains effective antimicrobial activity, which have great benefit for food packing applications.

scholarly journals Controlled and cellulose eco-friendly synthesis and characterization of Bi2O2CO3 quantum dot nanostructures (QDNSs) and drug delivery study

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Hojat Samarehfekri ◽  
Hamid Reza Rahimi ◽  
Mehdi Ranjbar
Keyword(s):  
Quantum Dot ◽  
Optical Band Gap ◽  
Biological Therapy ◽  
Skin Extract ◽  
Force Microscopy ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Different Temperatures ◽  
Green Capping Agent

AbstractThis work aimed to prepare solvent-free or green Bi2O2CO3 for quantum dot nanostructures (QDNSs) based on cellulose as a stabilizer and green capping agent to sorafenib delivery for liver targeting. Because the walnut tree is one of the most abundant trees in Iran, it was tried to synthesize Bi2O2CO3 QDNSs using a walnut skin extract. The saturation magnetization for Bi2O2CO3 QDNSs was calculated to be 68.1. Also, the size of products was measured at around 60–80 nm with the Debye–Scherrer equation. Moreover, the morphology, functional groups, and crystallography of the Bi2O2CO3 nanoparticles were investigated using atomic force microscopy, scanning electron microscopy, vibrating-sample magnetometer, and Uv–vis spectroscopy. The results demonstrated that Bi2O2CO3 QDNSs have opto-magnetic properties and they can be suggested as the candidate materials for the sorafenib delivery on the liver tissue. The optical band gap estimated for Bi2O2CO3 QDNSs was found to be red-shift from 3.22 eV. This study suggests the preparation of the Bi2O2CO3 QDNSs based on cellulose as new opto-magnetic materials at different temperatures of 180 °C, 200 °C, 220 °C, and 240 °C for sorafenib delivery as a type of biological therapy drug.

Imaging Electron Transport across Grain Boundaries in an Integrated Electron and Atomic Force Microscopy Platform: Application to Polycrystalline Silicon Solar Cells

2009 ◽  
Vol 1153 ◽  
Author(s):  
Manuel J Romero ◽  
Fude Liu ◽  
Oliver Kunz ◽  
Johnson Wong ◽  
Chun-Sheng Jiang ◽  
...  
Keyword(s):  
Thin Films ◽  
Atomic Force Microscopy ◽  
Solar Cells ◽  
Electron Transport ◽  
Grain Boundaries ◽  
Polycrystalline Silicon ◽  
High Energy ◽  
Dominant Factor ◽  
Force Microscopy ◽  
Atomic Force

AbstractWe have investigated the local electron transport in polycrystalline silicon (pc-Si) thin-films by atomic force microscopy (AFM)-based measurements of the electron-beam-induced current (EBIC). EVA solar cells are produced at UNSW by <i>EVAporation</i> of a-Si and subsequent <i>solid-phase crystallization</i>–a potentially cost-effective approach to the production of pc-Si photovoltaics. A fundamental understanding of the electron transport in these pc-Si thin films is of prime importance to address the factors limiting the efficiency of EVA solar cells. EBIC measurements performed in combination with an AFM integrated inside an electron microscope can resolve the electron transport across individual grain boundaries. AFM-EBIC reveals that most grain boundaries present a high energy barrier to the transport of electrons for both p-type and n-type EVA thin-films. Furthermore, for p-type EVA pc-Si, in contrast with n-type, charged grain boundaries are seen. Recombination at grain boundaries seems to be the dominant factor limiting the efficiency of these pc-Si solar cells.

A novel synthesis and characterization of transparent CdS thin films for CdTe/CdS solar cells

2020 ◽  
Vol 126 (2) ◽  
Author(s):  
Md.Ferdous Rahman ◽  
Jaker Hossain ◽  
Abdul Kuddus ◽  
Samia Tabassum ◽  
Mirza H. K. Rubel ◽  
...  
Keyword(s):  
Thin Films ◽  
Solar Cells ◽  
Synthesis And Characterization ◽  
Novel Synthesis ◽  
Cds Thin Films
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