scholarly journals Ga-Doped ZnO Coating—A Suitable Tool for Tuning the Electrode Properties in the Solar Cells with CdS/ZnS Core-Shell Quantum Dots

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 137
Author(s):  
Mariya Aleksandrova ◽  
Tatyana Ivanova ◽  
Velichka Strijkova ◽  
Tsvetozar Tsanev ◽  
Ajaya Kumar Singh ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Quantum Dots ◽  
Solar Cells ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Optical Transmittance ◽  
Visible Range ◽  
Infrared Range ◽  
Layer System ◽  
Doped Zno

Two layer system from sputtered indium tin oxide (ITO) and gallium doped zinc oxide (Ga:ZnO, GZO) were studied for transparency in the visible electromagnetic range, reflectivity in the near infrared range, conductivity and valent band for a solar cells with quantum dots. The bi-layer coatings produced at optimized oxygen partial pressure, films thickness and surface roughness exhibit improved optical properties without worsening the electrical parameters, even if additional oxygen introduction during the reactive sputtering of the GZO. With an average optical transmittance of 91.3% in the visible range, average reflection and resistivity lower than 0.4 × 10−2 Ω.cm, these coatings are suitable for top electrode in the solar cells. The obtained results reveal that multilayered stacks of transparent ITO/Ga-doped ZnO coatings possess relatively low surface roughness (7–9 nm) and appropriate refractive index. The additional oxidation of GZO films induces modification of the film thickness and respectively of their optical performances.

scholarly journals Fabrication of Transparent ITO/Ga-Doped ZnO Coating as a Front Panel Electrode toward Efficient Thin Film Solar Cells

2020 ◽  
Vol 2 (1) ◽  
pp. 1
Author(s):  
Mariya Aleksandrova ◽  
Tatyana Ivanova ◽  
Kostadinka Gesheva ◽  
Velichka Strijkova ◽  
Tsvetozar Tsanev ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Dot ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Visible Region ◽  
Optical Transmittance ◽  
Front Panel ◽  
Visible Range ◽  
Infrared Range ◽  
Electromagnetic Spectrum

Bi-layer coatings from sputtered indium tin oxide (ITO) and gallium doped zinc oxide (Ga:ZnO) were investigated for transparency in the visible range of the electromagnetic spectrum, optical rejection ability in the near infrared spectrum and conductivity for the novel quantum dot-based solar cells. The multilayer stack produced at optimal oxygen partial pressure exhibits improved optical properties without worsening the electrical ones, even after additional oxidation during the reactive sputtering of the metal-oxides. With a mean optical transmittance of 91.3% in the visible region, mean optical rejection greater than 65% in the infrared range and resistivity lower than 0.4 × 10−2 Ω.cm, this coating is good candidate for front panel electrode in the CdS/ZnS core-shell quantum dot-based solar cells.

Highly efficient ITO-free organic solar cells with a column-patterned microcavity

2021 ◽  
Author(s):  
Jiang Huang ◽  
Dan Zhao ◽  
Zifan Dou ◽  
Qingshan Fan ◽  
Na Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Tin Oxide ◽  
Organic Solar Cells ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Infrared Range ◽  
Highly Efficient ◽  
Near Infrared Range

Highly efficient organic solar cells (OSCs) are demonstrated with the new design of column-patterned microcavity, which allows enhancing the external quantum efficiencies of both visible and near-infrared range of indium tin oxide free OSCs.

Microcrystalline and Amorphous Photovoltaic Silicon Materials Performance Optimization

2016 ◽  
Vol 870 ◽  
pp. 74-82 ◽  
Author(s):  
S.N. Chebotarev ◽  
A.S. Pashchenko ◽  
D.A. Arustamyan
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Performance Optimization ◽  
Near Infrared ◽  
Open Circuit ◽  
Visible Range ◽  
Infrared Range ◽  
Improved Performance ◽  
Crystalline Solar Cell

A design of a thin-film solar cell based on microcrystalline and amorphous silicon α-Si:H(n-i-p)/μс-Si:O(n-i-p)/μс-Si:H(n-i-p) was proposed. A physical model and software to calculate the functional characteristics of these solar cells were developed. The numerical simulation results show that the efficiency of the optimized thin-film solar cells may reach up to 16.3 %, open circuit voltage 1.96 V, fill factor 78 %. Improved performance of the non-crystalline solar cell is achieved by an increase in absorbance in the visible range 500 – 800 nm to 40 – 60 % and in the near-infrared range of the solar radiation 800 – 1100 nm to 70 – 75 %.

Near Infrared Photothermoelectric Effect in Transparent AZO/ITO/Ag/ITO Thin Films

2021 ◽  
Author(s):  
Catarina Bianchi ◽  
Ana Marques ◽  
Rui Silva ◽  
Tomas Calmeiro ◽  
Isabel Ferreira
Keyword(s):  
Indium Tin Oxide ◽  
Near Infrared ◽  
Thermal Control ◽  
High Energy ◽  
Visible Range ◽  
Azo Thin Film ◽  
Ito Thin Films ◽  
Aluminum Doped Zinc Oxide ◽  
Temperature Constant ◽  
20 Nm

Abstract A new concept of oxide-metal-oxide structures that combine photothermoelectric effect with high reflectance (~80%) at wavelengths in the infrared (> 1100 nm) and high transmittance in the visible range is reported here. This was observed in optimized ITO/Ag/ITO structure, 20 nm of Siver (Ag) and 40 nm of Indium Tin Oxide (ITO), deposited on Aluminum doped Zinc Oxide (AZO) thin film. These layers show high energy saving efficiency by keeping the temperature constant inside a glazed compartment under solar radiation, but additionally they also show a photothermoelectric effect. Under uniform heating of the sample a thermoelectric effect is observed (S = 40 μV/K), but when irradiated, a potential proportional to the intensity of the radiation is also observed. Therefore, in addition to thermal control in windows, these low emission coatings can be applied as transparent photothermoelectric devices.

Supersensitization of CdS Quantum Dots with a Near-Infrared Organic Dye: Toward the Design of Panchromatic Hybrid-Sensitized Solar Cells

ACS Nano ◽  
2011 ◽  
Vol 5 (11) ◽  
pp. 9238-9245 ◽  
Author(s):  
Hyunbong Choi ◽  
Roxana Nicolaescu ◽  
Sanghyun Paek ◽  
Jaejung Ko ◽  
Prashant V. Kamat
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Near Infrared ◽  
Organic Dye ◽  
Cds Quantum Dots ◽  
Sensitized Solar Cells

Analysis of Defects and Surface Roughness on the Hydrogenated Amorphous Silicon (a-Si:H) Intrinsic Thin Film for Solar Cells

2019 ◽  
Vol 966 ◽  
pp. 398-403
Author(s):  
Yoyok Cahyono ◽  
Novita Dwi Purnamasari ◽  
Mochamad Zainuri ◽  
Suminar Pratapa ◽  
Darminto
Keyword(s):  
Thin Film ◽  
Surface Roughness ◽  
Solar Cells ◽  
Band Gap ◽  
Indium Tin Oxide ◽  
Energy Band ◽  
Thin Layers ◽  
Oxide Glass ◽  
Energy Band Gap ◽  
Hydrogen Dilution

Effect of defect - through observation of energy absorption Urbach, on deposition rate, energy band gap, and surface roughness of intrinsic thin film are investigated using Radio Frequency Plasma Enhance Chemical Vapor Deposition (RF-PECVD). Films are grown on ITO (Indium Tin Oxide) glass substrate. Analysis of energy band gap is conducted to determine changes in the structure of a thin film of a-Si:H. Energy band gap is important to determine the portion of the spectrum of sunlight that is absorbed solar cells. From the characterization using UV-Vis spectrometer and the Tauc’s plot method, the width of the resulting energy band gap is greater if the hydrogen dilution is increased. It can be shown that the increase of the hydrogen dilution, will increase the energy band gap, and the surface roughness of thin layers. Instead, the improvement of the hydrogen dilution decrease the rate of deposition and Urbach energy. It is estimated that with greater hydrogen dilution, an intrinsic thin film of a-Si:H is more conductive for more reduction in residual of band tail defects or dangling bond defects.

Influence of surface roughness and surface moisture of plastics on sensor-based sorting in the near infrared range

2019 ◽  
Vol 37 (8) ◽  
pp. 843-850 ◽  
Author(s):  
Bastian Küppers ◽  
Sabine Schloegl ◽  
Gernot Oreski ◽  
Roland Pomberger ◽  
Daniel Vollprecht
Keyword(s):  
Surface Roughness ◽  
Near Infrared ◽  
Thermoplastic Polyurethane ◽  
Low Density Polyethylene ◽  
Infrared Range ◽  
Low Density ◽  
Surface Moisture ◽  
Landfill Mining ◽  
Sensor Based Sorting

In the project ‘NEW-MINE’ the use of sensor-based sorting machinery in the field of ‘landfill mining’ is investigated. Defilements pose a particular challenge in the treatment and sorting of plastics contained in landfills. For this reason, the effects of various pollutants caused by the interactions in the landfill body or the mechanical treatment steps in landfill mining are examined. In the following elaboration, the focus is on the influences of surface moisture and surface roughness of plastics on sensor-based sorting by means of near-infrared technology. Near-infrared radiation (NIR) in a wavelength range of 990 nm to 1500 nm has been used for the detection and classification of plastic particles. The experiments demonstrate that increased surface roughness reduces signal noise and thereby improves the classification of both spectrally similar and transparent plastics, but reduces the yield of low-softening plastics because their sliding speed on a sensor-based chute sorter varies as a result of the heating of the chute. Surface moisture causes the absorption of radiation from 1115 nm (high density polyethylene [HDPE], linear low density polyethylene [LLDPE], polyethylen terephthalate [PET] and polyvinylchloride [PVC]) or from 1230 nm (low density polyethylene [LDPE], polypropylene [PP] and thermoplastic polyurethane [TPU]) up to at least 1680 nm, which causes amplification or attenuation of various extremes in the derivative. However, the influence of surface moisture on the yield of plastics is usually very low and depends on the spectral differences between the different plastics.

scholarly journals Atomic Layer-Deposited Al-Doped ZnO Thin Films for Display Applications

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 539 ◽  
Author(s):  
Dimitre Dimitrov ◽  
Che-Liang Tsai ◽  
Stefan Petrov ◽  
Vera Marinova ◽  
Dimitrina Petrova ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Indium Tin Oxide ◽  
Near Infrared ◽  
Atomic Layer ◽  
Optical Transmittance ◽  
Flexible Polymer ◽  
Polymer Dispersed ◽  
Infrared Spectral ◽  
Aluminum Doped Zinc Oxide

The integration of high uniformity, conformal and compact transparent conductive layers into next generation indium tin oxide (ITO)-free optoelectronics, including wearable and bendable structures, is a huge challenge. In this study, we demonstrate the transparent and conductive functionality of aluminum-doped zinc oxide (AZO) thin films deposited on glass as well as on polyethylene terephthalate (PET) flexible substrates by using an atomic layer deposition (ALD) technique. AZO thin films possess high optical transmittance at visible and near-infrared spectral range and electrical properties competitive to commercial ITO layers. AZO layers deposited on flexible PET substrates demonstrate stable sheet resistance over 1000 bending cycles. Based on the performed optical and electrical characterizations, several applications of ALD AZO as transparent conductive layers are shown—AZO/glass-supported liquid crystal (LC) display and AZO/PET-based flexible polymer-dispersed liquid crystal (PDLC) devices.

Towards high efficiency air-processed near-infrared responsive photovoltaics: bulk heterojunction solar cells based on PbS/CdS core–shell quantum dots and TiO2nanorod arrays

Nanoscale ◽  
2015 ◽  
Vol 7 (22) ◽  
pp. 10039-10049 ◽  
Author(s):  
Belete Atomsa Gonfa ◽  
Mee Rahn Kim ◽  
Nazar Delegan ◽  
Ana C. Tavares ◽  
Ricardo Izquierdo ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Near Infrared ◽  
High Efficiency ◽  
Bulk Heterojunction ◽  
Core Shell ◽  
Heterojunction Solar Cells ◽  
Bulk Heterojunction Solar Cells

Properties of Indium Tin Oxide Films Prepared by Two-Targets Magnetron Sputtering

2014 ◽  
Vol 997 ◽  
pp. 337-340
Author(s):  
Jian Guo Chai
Keyword(s):  
Magnetron Sputtering ◽  
Substrate Temperature ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Optical Transmittance ◽  
Visible Range ◽  
Glass Substrates ◽  
Optimized Conditions ◽  
Tin Oxide Films ◽  
Ito Films

Indium tin oxide (ITO) films were deposited on glass substrates by magnetron sputtering. Properties of ITO films showed a dependence on substrate temperature. With an increasing in substrate temperature, the intensity of XRD peak increased and the grain size showed an evident increasing. The results show that increasing substrate temperature remarkably improves the characteristics of the films. The sheet resistance of 10 Ω/sq and the maximum optical transmittance of 90% in the visible range with optimized conditions can be achicved. The results of experiment demonstrate that high-quality films have been achieved by this technique.

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