scholarly journals Unconventional Solar Energy: Singlet Fission

2019 ◽  
Vol 03 (01) ◽  
pp. 84-91 ◽  
Author(s):  
Josef Michl
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Energy ◽  
Excitation Energy ◽  
Triplet State ◽  
Excited Molecule ◽  
Singlet Fission ◽  
Single Junction ◽  
Simple Rules ◽  
Solar Cell Material

Described simply, singlet fission is a process in which a singlet excited molecule transfers about half of its excitation energy to a neighbor molecule, both end up in their triplet state, and the two triplet excitations diffuse apart. The process is of interest for solar cells. Used in conjunction with ordinary solar cell material, a layer of singlet-fission material offers an opportunity to utilize higher energy photons more efficiently. The maximum theoretical efficiency is then close to 1/2 instead of the Shockley-Queisser value of 1/3 that applies to an ordinary single-junction cell. The problem that prevents an immediate production of singlet fission solar cells is the dearth of sufficiently stable efficient materials. The formulation of simple rules for the design of suitable compounds for the purpose is discussed.

scholarly journals Pemanfaatan Motor Listrik Bertenaga Energi Matahari Sebagai Penarik Jaring Pada Kapal Nelayan

2019 ◽  
Vol 2 (3) ◽  
pp. 85-89
Author(s):  
Ali Basrah Pulungan ◽  
Asnil Asnil ◽  
Rahmat Hidayat ◽  
Juli Sardi ◽  
Syaiful Islami
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Energy ◽  
Electric Motor ◽  
Weather Conditions ◽  
Cell System ◽  
Fuel Oil ◽  
Motor Speed ◽  
Hand Tools ◽  
Fishing Boat

This article aim to be able to take advantage of an electric motor as a net puller on a fishing boat using solar energy. The use of human labor as a net puller requires a large amount of energy and needs a break to be able to do more withdrawal activities, so the number of withdrawals that can be done is very limited. Pantai Jaya fishing groups as partners are among the 20 active fishing groups in the Pasie Nan Tigo sub-district of Koto Tangah subdistrict of Padang City who experience these problems. The problem of this partner can be given a solution in the form of the use of an electric motor as a towing net on a fishing boat. In order not to cause problems in terms of electricity supply, solar energy can be used by using solar cells, so there is no addition of fuel oil. The implementation method given is direct installation and provision of extension materials on the use of solar cell technology and the introduction of components and hand tools. This activity was carried out for two days which included preparation, installation and training, followed by a group of fishermen. The fishing group received a set of solar cells, electric motors, batteries and other accessories and installed them. Based on tests that have been carried out in sunny weather conditions at 300C, a load of 50 kg with a rated voltage at that time 12.4V, motor speed 2.7m / min, 2.4A. Based on the results of these tests indicate that the solar cell system has worked according to the parameters it should. Therefore, it can be said that this activity has been carried out properly and the solar cell system is functioning properly. Participants hope for these activities to be carried out for the following year, because there are still a number of fishing boat groups that are in dire need.

Prediction of Solar Cell Materials via Unsupervised Literature Learning

2021 ◽  
Author(s):  
Lei Zhang ◽  
Mu He
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Language Processing ◽  
Perovskite Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Cell Types ◽  
Data Driven ◽  
Cell Material ◽  
Textual Data ◽  
Solar Cell Material

Abstract Despite the significant advancement of the data-driven studies for physical science, the textual data that are numerous in the literature are not fully embraced by the physics and materials community. In this manuscript, we successfully employ the natural language processing (NLP) technique to unsupervisedly predict the existence of solar cell types including the dye-sensitized solar cells and the perovskite solar cells based on literatures published prior to their first discovery without human annotation. Enlightened by this, we further identify possible solar cell material candidates via NLP starting with a comprehensive training database of 3.2 million paper abstracts published before 2021. The NLP model effectively predicts the existing solar cell materials, while an uncommon solar cell material namely PtSe2 is suggested as an appropriate candidate for the future solar cells. Its optoelectronic properties are comprehensive investigated via first-principles calculations to reveal the decent stability and optoelectronic performance of the NLP-predicted candidate. This study demonstrates the viability of the textual data for the data-driven materials prediction and highlights the NLP method as a powerful tool to reliably predict the solar cell materials.

Numerical Simulation of Single Junction InGaN Solar Cell by SCAPS

2019 ◽  
Vol 821 ◽  
pp. 407-413 ◽  
Author(s):  
Mohamed Orabi Moustafa ◽  
Tariq Alzoubi
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Collection Efficiency ◽  
Short Circuit ◽  
Photovoltaic Performance ◽  
Surface Recombination ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Bandgap Energy ◽  
Single Junction

The performance of the InGaN single-junction thin film solar cells has been analyzed numerically employing the Solar Cell Capacitance Simulator (SCAPS-1D). The electrical properties and the photovoltaic performance of the InGaN solar cells were studied by changing the doping concentrations and the bandgap energy along with each layer, i.e. n-and p-InGaN layers. The results reveal an optimum efficiency of the InGaN solar cell of ~ 15.32 % at a band gap value of 1.32 eV. It has been observed that lowering the doping concentration NA leads to an improvement of the short circuit current density (Jsc) (34 mA/cm2 at NA of 1016 cm−3). This might be attributed to the increase of the carrier mobility and hence an enhancement in the minority carrier diffusion length leading to a better collection efficiency. Additionally, the results show that increasing the front layer thickness of the InGaN leads to an increase in the Jsc and to the conversion efficiency (η). This has been referred to the increase in the photogenerated current, as well as to the less surface recombination rate.

Photovoltaic effect in single-junction organic solar cell fabricated using vanadyl phthalocyanine soluble derivative

2015 ◽  
Vol 44 (1) ◽  
pp. 26-32 ◽  
Author(s):  
F. Aziz ◽  
Z. Ahmad ◽  
S.M. Abdullah ◽  
K. Sulaiman ◽  
M.H. Sayyad
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Spin Coating ◽  
Organic Solar Cell ◽  
Photovoltaic Effect ◽  
Content Type ◽  
Single Junction ◽  
Coating Technique ◽  
Phthalocyanine Derivative

Purpose – The purpose of this paper is to study the optical and electrical characteristics of a single-junction solar cell based on a green-colour dye vanadyl 2,9,16, 23-tetraphenoxy-29H, 31H-phthalocyanine (VOPcPhO). The use of soluble vanadyl phthalocyanine derivative makes it very attractive for photovoltaic applications due to its tunable properties and high solubility. Design/methodology/approach – A photoactive layer of VOPcPhO has been sandwiched between indium tin oxide (ITO) and aluminium (Al) electrodes to produce a ITO/PEDOT:PSS/VOPcPhO/Al photovoltaic device. The VOPcPhO thin film is deposited by a simple spin coating technique. To obtain the optimal thickness for the solar cell device, different thicknesses of the photoactive layer, achieved by manipulating the spin rate, have been investigated. Findings – The device exhibited photovoltaic effect with the values of Jsc, Voc and FF equal to 5.26 × 10-6 A/cm2, 0.621 V and 0.33, respectively. The electronic parameters of the cell have been obtained from the analysis of current-voltage characteristics measured in dark. The values of ideality factor and barrier height were found to be 2.69 and 0.416 eV, respectively. The optical examination showed that the material is sensitive to light in the UV region between 270 nm and 410 nm, as well as in the visible spectrum within the range of 630 nm and 750 nm. Research limitations/implications – The solar cell based on a single layer of vanadyl phthalocyanine derivative results in low efficiency, which can be enhanced by introducing a variety of donor materials to form bulk heterojunction solar cells. Practical implications – The spin coating technique provides a simple, less expensive and effective approach for preparing thin films. Originality/value – A novel thin-film, single-junction organic solar cell, fabricated by using VOPcPhO, has been investigated for the first time ever. The vanadyl phthalocyanine derivative together with a donor material will have potential application for improved efficiency of the solar cells.

The Research on Solar Cells Based on Improving Conversion Efficiency

2015 ◽  
Vol 730 ◽  
pp. 173-177
Author(s):  
Yu Wen Tang
Keyword(s):  
Power Generation ◽  
Solar Cells ◽  
Solar Cell ◽  
Solar Energy ◽  
Conversion Efficiency ◽  
Photovoltaic Effect ◽  
New Technology ◽  
Electrical Energy ◽  
Solar Thermal Energy ◽  
Photovoltaic Power

Solar energy is an inexhaustible and renewable energy without environmental pollution. Solar energy can be used in three kinds of forms: solar thermal energy, photochemical conversion and photovoltaic power generation. Among these, the final form of photovoltaic power generation is electricity which can be transported, applied and stored conveniently. On the basis of photovoltaic effect, solar cell is developed as a new technology to convert light energy into electrical energy using semiconductor. Up to now the two key problems of the development of solar cells are how to improve the conversion efficiency and reduce cost. Therefore, the material and production technology used for solar cells are discussed based on improving conversion efficiency in this article.

scholarly journals Photovoltaic Solar Energy: Is It Applicable in Brazil? – A Review Applied to Brazilian Case

2019 ◽  
Vol 66 (2) ◽  
pp. 99-120
Author(s):  
Wilmer Emilio García Moreno ◽  
Andressa Ullmann Duarte ◽  
Litiéle dos Santos ◽  
Rogério Vescia Lourega
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Energy ◽  
Energy Demand ◽  
Fossil Fuels ◽  
Cost Of Energy ◽  
Photovoltaic Solar Energy ◽  
The Cost ◽  
Photovoltaic Technologies ◽  
Brazilian Case

AbstractThe photovoltaic technologies have been developed year by year in different countries; however, there are some countries where this kind of energy is being born, such as the Brazilian case. In this paper, some important parameters are analysed and applied to different solar cell materials, identifying that if the fossil fuels were substituted by solar cells, it would reduce the CO2 emissions by 93.2%. In addition, it is shown that the efficiency of solar cells is not as farther as it could be thought from coal thermoelectrical plants in Brazil and the cost of energy using solar cells could be as good as these thermoelectrical plants. Finally, the potentiality of Brazilian territory to implant this technology is presented, identifying that with the use of 0.2% of the territory, the energy demand could be supplied.

Development of a-SiOx:H/a-Si1-xGex:H Tandem Solar Cell for Triple-Junction Solar Cell Applications

2012 ◽  
Vol 1426 ◽  
pp. 125-130
Author(s):  
Y.W. Tseng ◽  
Y.H. Lin ◽  
H.J. Hsu ◽  
C.H. Hsu ◽  
C.C. Tsai
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Silicon Oxide ◽  
Defect Density ◽  
Tandem Solar Cell ◽  
Tandem Solar Cells ◽  
Single Junction ◽  
Cell Efficiency ◽  
Photo Response ◽  
Hydrogenated Amorphous

ABSTRACTIn this work, the development of hydrogenated amorphous silicon oxide (a-SiOx:H) absorber, a-SiOx:H single-junction solar cells and a-SiOx:H/a-Si1-xGex:H tandem solar cells were presented. The oxygen content of the a-SiOx:H materials controlled by changing CO2-to-SiH4 flow ratio had significant influence on its opto-electrical property. As CO2/SiH4 increased from 0 to 2, the bandgap increased from 1.75 to 2.13 eV while the photo-conductivity decreased from 8.25×10-6 to 1.02×10-8 S/cm. Photo-response of over 105 can be obtained as the bandgap was approximately 1.90 eV. The performance of single-junction solar cells revealed a better efficiency can be obtained as the absorber bandgap was in the range of 1.83 to 1.90 eV. Further increase of the absorber bandgap may lead to the increase in bulk defect density which deteriorated the cell efficiency. Finally, a-SiOx:H/a-Si1-xGex:H tandem solar cell was fabricated with the absorber bandgap of 1.90 eV in the top cell. By matching the current between the component cells, the tandem cell efficiency of 7.38% has been achieved.

Recent Advances in A-Si Solar Cell Technology in Japan

1986 ◽  
Vol 70 ◽  
Author(s):  
Y. Kuwano
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Single Junction ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Recent Advances ◽  
Cell Structures ◽  
Cell Stability ◽  
Terminal Structure ◽  
Conversion Efficiencies

ABSTRACTRecent advances in a-Si solar cells in Japan are reviewed. Improvements in single-junction and multi-junction solar cells are described in three main points, namely, fabrication methods, materials, and cell structures. Recently, a conversion efficiency of 11.7% was obtained for a single-junction structure. For an a-Si/poly-Si stacked structure and an a-Si/(CdS/CdTe) 4 terminal structure, conversion efficiencies of more than 13% were achieved.Then recent advances in the prevention of the light induced degradation of a-Si solar cells is mentioned. Several methods which can improve the a-Si solar cell stability are described.Finally, the present status of the industrialization of a-Si solar cells and some of the latest applications are described together with their propects.

Water as infrared filter for silicon solar cell efficiency enhancement for Kerman province of Iran as a talent region for solar energy production

2017 ◽  
Vol 14 (5) ◽  
pp. 363-367 ◽  
Author(s):  
Mohammad Bagher Askari ◽  
Mohammad Reza Bahrampour ◽  
Vahid Mirzaei ◽  
Amir Khosro Beheshti Marnani ◽  
Mirhabibi Mohsen
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Energy ◽  
Energy Production ◽  
Silicon Solar Cell ◽  
Silicon Solar Cells ◽  
Efficiency Enhancement ◽  
Content Type ◽  
Solar Cell Efficiency ◽  
Cell Efficiency

Purpose The aim of this paper is to apply a watery infrared filter for silicon solar cell efficiency enhancement in Kerman province of Iran as a talent region for solar energy production. Design/methodology/approach With this research, the water is applied as a filter for silicon solar cells in different volumes and thicknesses. Findings The obtained results showed that using various amounts of water could be a suitable choice for increasing the efficiency of silicon solar cells. Originality/value Other wavelength regions just cause the increase in the entropy and decrease in the efficiency. With this research, the water is applied as a filter for silicon solar cell in different volumes and thickness. The obtained results showed that using different thicknesses of water could be suitable choice for increasing the efficiency of silicon solar cell.

Band Discontinuity Effect on a-Si:H and a-SiGe:H Solar Cells

1995 ◽  
Vol 377 ◽  
Author(s):  
X. Xu ◽  
A. Banerjee ◽  
J. Yang ◽  
S. Guha ◽  
K. Vasanth ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Solar Cells ◽  
Solar Cell ◽  
Valence Band ◽  
Cell Performance ◽  
Experimental Results ◽  
Microcrystalline Silicon ◽  
Solar Cell Performance ◽  
Single Junction ◽  
P Type

ABSTRACTThe electrical bandgap of microcrystalline silicon (μc-Si:H) p type layers used in a-Si:H alloy solar cells and the band edge discontinuities between μc-Si:H and a-Si:H alloys have been determined by internal photoemission measurements. The bandgap of μc-Si:H is found to be in the range of 1.50 to 1.57 eV, and the discontinuities at the conduction and the valence band edges are 0 to 0.07 and 0.26 to 0.35 eV, respectively. Use of these parameters in the numerical simulation of single-junction a-Si:H and a-SiGe:H alloy solar cells is found to predict experimental results of solar cell performance.

Sign in / Sign up

Export Citation Format

Share Document