scholarly journals New Results in Optical Modelling of Quantum Well Solar Cells

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Silvian Fara ◽  
Paul Sterian ◽  
Laurentiu Fara ◽  
Mihai Iancu ◽  
Andreea Sterian
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Well ◽  
Absorption Coefficient ◽  
Quantum Efficiency ◽  
Quantum Confinement ◽  
Quantum Confinement Effect ◽  
Refraction Index ◽  
Absorption Process ◽  
Optical Modelling

This project brought further advancements to the quantum well solar cell concept proposed by Keith Barnham. In this paper, the optical modelling of MQW solar cells was analyzed and we focussed on the following topics: (i) simulation of the refraction index and the reflectance, (ii) simulation of the absorption coefficient, (iii) simulation of the quantum efficiency for the absorption process, (iv) discussion and modelling of the quantum confinement effect, and (v) evaluation of datasheet parameters of the MQW cell.

Quantum Confinement Modeling and Simulation for Quantum Well Solar Cells

2012 ◽  
pp. 48-58
Author(s):  
Laurentiu Fara ◽  
Mihai Razvan Mitroi
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
Quantum Efficiency ◽  
Quantum Confinement ◽  
Near Infrared ◽  
Internal Quantum Efficiency ◽  
Infrared Range ◽  
Cell Efficiency ◽  
New Energy ◽  
Valence Bands

In this chapter, the authors present the modelling and simulation of the multi-layered quantum well solar cells as well as the simulated results of this model. The quantum confinement of a semiconductor induces new energy levels, located in the band gap, as well as resonant levels located in the conduction and valence bands. These levels allow supplementary absorption in the visible and near infrared range. The quantum efficiency of the supplementary absorption is calculated within the infinite rectangular quantum well approximation. As the absorption excites carriers in the gap of each layer, even a small absorption significantly increases the photocurrent (by photoassisted tunneling) and, therefore, the cell efficiency. The results of the simulation are presented for the internal quantum efficiency of the transitions between the resonant levels of GaAs, as well as the internal quantum efficiency of the transitions between the confinement levels for GaAs and AlxGa1-xAs. New directions for the research of quantum well solar cells are indicated.

Finely Regulated Quantum Well Structure in Quasi-2D Ruddlesden-Popper Perovskite Solar Cell with an Efficiency Exceeding 20%

2021 ◽  
Author(s):  
Jianghu Liang ◽  
Zhanfei Zhang ◽  
Qi Xue ◽  
Yiting Zheng ◽  
Xueyun Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Well ◽  
Quantum Confinement ◽  
Perovskite Solar Cells ◽  
Perovskite Solar Cell ◽  
Two Dimensional ◽  
Confinement Effects ◽  
Quantum Confinement Effects ◽  
The Stability

The development of quasi-two-dimensional (2D) Ruddlesden-Popper phase perovskite solar cells (PSCs) has greatly improved the stability of devices. However, the presence of quantum confinement effects and insulating spacer cations in...

Quantum Confinement Modeling and Simulation for Quantum Well Solar Cells

2014 ◽  
pp. 731-741
Author(s):  
Laurentiu Fara ◽  
Mihai Razvan Mitroi
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
Quantum Efficiency ◽  
Quantum Confinement ◽  
Near Infrared ◽  
Internal Quantum Efficiency ◽  
Infrared Range ◽  
Cell Efficiency ◽  
New Energy ◽  
Valence Bands

In this chapter, the authors present the modelling and simulation of the multi-layered quantum well solar cells as well as the simulated results of this model. The quantum confinement of a semiconductor induces new energy levels, located in the band gap, as well as resonant levels located in the conduction and valence bands. These levels allow supplementary absorption in the visible and near infrared range. The quantum efficiency of the supplementary absorption is calculated within the infinite rectangular quantum well approximation. As the absorption excites carriers in the gap of each layer, even a small absorption significantly increases the photocurrent (by photoassisted tunneling) and, therefore, the cell efficiency. The results of the simulation are presented for the internal quantum efficiency of the transitions between the resonant levels of GaAs, as well as the internal quantum efficiency of the transitions between the confinement levels for GaAs and AlxGa1-xAs. New directions for the research of quantum well solar cells are indicated.

Quantum-Well Solar Cells

MRS Bulletin ◽  
1993 ◽  
Vol 18 (10) ◽  
pp. 51-55 ◽  
Author(s):  
Keith Barnham ◽  
Jenny Barnes ◽  
Guido Haarpaintner ◽  
Jenny Nelson ◽  
Mark Paxman ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Quantum Well ◽  
Quantum Wells ◽  
Forward Bias ◽  
Flat Band ◽  
Output Current ◽  
Novel Approach ◽  
Modulator Structure ◽  
Conventional Cell

The best present-day single-bandgap solar cells have efficiencies around 20–25%. However, the Carnot efficiency of the earth-sun system is 95%, so there is considerable potential for improvement. The fundamental efficiency limitation in a conventional solar cell results from the tradeoff between a low bandgap which maximizes light absorption and hence output current and a high bandgap which maximizes output voltage. As a result, the maximum theoretical efficiency of a conventional solar cell is around 30% in unconcentrated sunlight at a bandgap close to that of GaAs.The quantum-well solar cell is a novel approach to higher efficiency. In its simplest form, shown in Figure 1, it consists of a multiquantum-well (MQW) system in the undoped region of a p-i-n solar cell. For light with energy greater than the band-gap Eg, the quantum-well cell behaves like a conventional cell. However, light with energy below Eg can be absorbed in the quantum wells. Our studies show that if the material quality is good, the electrons and holes escape from the wells and contribute to a higher output current at a voltage between that of the barrier and well material. In AlGaAs/GaAs test devices, we have obtained efficiency enhancements of a factor of more than two when cells with quantum wells are compared with identical cells without wells.The structure in Figure 1 is, of course, essentially similar to the MQW photodiode or modulator structure that operates in reverse bias, and the quantum-well laser that operates in forward bias beyond flat band.

High quantum efficiency InGaN/GaN multiple quantum well solar cells with spectral response extending out to 520 nm

2011 ◽  
Vol 98 (20) ◽  
pp. 201107 ◽  
Author(s):  
R. M. Farrell ◽  
C. J. Neufeld ◽  
S. C. Cruz ◽  
J. R. Lang ◽  
M. Iza ◽  
...  
Keyword(s):  
Solar Cells ◽  
Quantum Well ◽  
Quantum Efficiency ◽  
Spectral Response ◽  
Multiple Quantum Well ◽  
Multiple Quantum ◽  
High Quantum Efficiency ◽  
High Quantum

Model-based Quantitative Assessment of Crystallinity and Parasitic Absorption in Microcrystalline Silicon Solar Cells

2012 ◽  
Vol 1426 ◽  
pp. 383-387
Author(s):  
Thomas Lanz ◽  
Corsin Battaglia ◽  
Christophe Ballif ◽  
Beat Ruhstaller
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Light Scattering ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Quantitative Assessment ◽  
Silicon Solar Cells ◽  
Normalization Procedure ◽  
Microcrystalline Silicon ◽  
Scattering Model

ABSTRACTWe investigate the influence of the crystallinity of the absorber layer and parasitic absorption in the doped layers and electrodes on the external quantum efficiency and reflection of microcrystalline silicon (μc-Si:H) solar cells. Using an optical light scattering model we systematically study variations in the crystallinity and validate a simple normalization procedure that allows assessing the gains that can be achieved by reducing the parasitic absorption. The optimization potential is demonstrated with solar cell samples with increased crystallinity and eliminated parasitic absorption.

Dye Sensitized Solar Cell Using Natural Dyes as Chromophores - Review

2013 ◽  
Vol 771 ◽  
pp. 39-51 ◽  
Author(s):  
I. Jinchu ◽  
C.O. Sreekala ◽  
K.S. Sreelatha
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Absorption Coefficient ◽  
Metal Oxide ◽  
Organic Dyes ◽  
Dye Sensitized Solar Cells ◽  
Solar Spectrum ◽  
Natural Dyes ◽  
Dye Sensitized Solar Cell ◽  
Dye Sensitized

The molecular dye is an essential component of the Dye sensitized solar cell (DSSC), and improvements in efficiency over the last 15 years have been achieved by tailoring the optoelectronic properties of the dye. The most successful dyes are based on ruthenium bipyridyl compounds, which are characterized by a large absorption coefficient in the visible part of the solar spectrum, good adsorption properties, excellent stability, and efficient electron injection. However, ruthenium-based compounds are relatively expensive, and organic dyes with similar characteristics and even higher absorption coefficients have recently been reported; solar cells with efficiencies of up to 9% have been reported. Organic dyes with a higher absorption coefficient could translate into thinner nanostructured metal oxide films, which would be advantageous for charge transport both in the metal oxide and in the permeating phase, allowing for the use of higher viscosity materials such as ionic liquids, solid electrolytes or hole conductors. Organic dyes used in the DSSC often bear a resemblance to dyes found in plants, fruits, and other natural products, and several dye-sensitized solar cells with natural dyes have been reported. This paper gives an over-view of the recent works in DSSC using the natural dyes as chromophores.

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