scholarly journals Super-Multi-Junction Solar Cells—Device Configuration with the Potential for More Than 50% Annual Energy Conversion Efficiency (Non-Concentration)

2019 ◽  
Vol 9 (21) ◽  
pp. 4598 ◽  
Author(s):  
Kenji Araki ◽  
Yasuyuki Ota ◽  
Hiromu Saiki ◽  
Hiroki Tawa ◽  
Kensuke Nishioka ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Spectrum ◽  
Energy Conversion Efficiency ◽  
Energy Yield ◽  
Bandgap Engineering ◽  
Radiative Efficiency ◽  
Lattice Matching ◽  
Lift Off ◽  
Potential Efficiency

The highest-efficiency solar cell in the efficiency race does not always give the best annual energy yield in real world solar conditions because the spectrum is always changing. The study of radiative coupling of concentrator solar cells implies that efficiency could increase by recycling the radiative recombination generated by the surplus current in the upper junction. Such a configuration is called a super-multi-junction cell. We expand the model in the concentrator solar cell to a non-concentrating installation. It is shown that this super-multi-junction cell configuration is robust and can keep maximum potential efficiency (50% in realistic spectrum fluctuation) for up to 10 junctions. The super-multi-junction cell is also robust in the bandgap engineering of each junction. Therefore, a future multi-junction may not be required for tuning the bandgap to match the standard solar spectrum, as well as relying upon artificial technologies such as epitaxial lift-off (ELO), wafer-bonding, mechanical-stacking, and reverse-growth, but merely uses upright and lattice-matching growth technologies. We present two challenging techniques; one is the optical cap layer that may be the directional photon coupling layer in the application of the photonics technologies, and another is the high-quality epitaxial growth with almost 100% radiative efficiency.

scholarly journals Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

2019 ◽  
Author(s):  
Kenji Araki ◽  
Yasuyuki Ota ◽  
Hiromu Saiki ◽  
Hiroki Tawa ◽  
Kensuke Nishioka ◽  
...  
Keyword(s):  
Solar Cell ◽  
Solar Spectrum ◽  
Energy Conversion Efficiency ◽  
Energy Yield ◽  
Bandgap Engineering ◽  
Radiative Efficiency ◽  
Lattice Matching ◽  
Lift Off ◽  
Potential Efficiency ◽  
Photon Coupling

The highest efficiency solar cell won in the efficiency race does not always give the most excellent annual energy yield in the real world solar condition that the spectrum is ever-changing. The study of the radiative coupling of the concentrator solar cells implied that the efficiency could increase by the recycle of the radiative recombination generated by the surplus current in upper junction. Such configuration is called by a super-multi-junction cell. We expanded the model in the concentrator solar cell to non-concentrating installation. It was shown that this super-multi-junction cell configuration was found robust and can keep the maximum potential efficiency (50 % in realistic spectrum fluctuation) up to 10 junctions. The super-multi-junction cell is also robust in the bandgap engineering of each junction. Therefore, the future multi-junction may not be needed to tune the bandgap for matching the standard solar spectrum, as well as relying upon artificial technologies like ELO (Epitaxial lift-off), wafer-bonding, mechanical-stacking, and reverse-growth, but merely uses up-right and lattice-matching growth technologies. We have two challenging techniques; one is the optical cap layer that may be the directional photon coupling layer in the application of the photonics technologies, and another is the high-quality epitaxial growth with almost 100 % of the radiative efficiency.

scholarly journals Super-Multi-Junction Solar Cell, Device Configuration with the Potential of More Than 50 % of the Annual Energy Conversion Efficiency (Non-Concentration)

2019 ◽  
Author(s):  
Kenji Araki ◽  
Yasuyuki Ota ◽  
Hiromu Saiki ◽  
Hiroki Tawa ◽  
Kensuke Nishioka ◽  
...  
Keyword(s):  
Solar Cell ◽  
Solar Spectrum ◽  
Energy Conversion Efficiency ◽  
Energy Yield ◽  
Solar Cell Device ◽  
Bandgap Engineering ◽  
Radiative Efficiency ◽  
Lattice Matching ◽  
Potential Efficiency ◽  
Photon Coupling

The highest efficiency solar cell won in the efficiency race does not always give the most excellent annual energy yield in the real world solar condition that the spectrum is ever-changing. The study of the radiative coupling of the concentrator solar cells implied that the efficiency could increase by the recycle of the radiative recombination generated by the surplus current in upper junction. Such configuration of the multi-junction cells is often called by a super-multi-junction cell. We expanded it to non-concentrating installation. It was shown that this super-multi-junction cell configuration was found robust and can keep almost the same to the maximum potential efficiency (50 % in realistic spectrum fluctuation) up to 10 junctions by a Monte Carlo method. The super-multi-junction cell is also robust of the bandgap engineering of each junction. Therefore, the future multi-junction may not be needed to tune the bandgap for matching the standard solar spectrum, as well as relying upon artificial technologies like ELO, wafer-bonding, mechanical-stacking, and reverse-growth, but merely uses up-right and lattice-matching growth technologies. Although we have two challenging techniques; one is the optical cap layer that may be the directional photon coupling layer in the application of the photonics technologies, and another is the high-quality epitaxial growth with almost 100 % of the radiative efficiency.

scholarly journals Maximizing tandem solar cell power extraction using a three-terminal design

2018 ◽  
Vol 2 (6) ◽  
pp. 1141-1147 ◽  
Author(s):  
Emily L. Warren ◽  
Michael G. Deceglie ◽  
Michael Rienäcker ◽  
Robby Peibst ◽  
Adele C. Tamboli ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Solar Spectrum ◽  
Operating Mechanism ◽  
Tandem Solar Cell ◽  
Tandem Solar Cells ◽  
Power Extraction ◽  
Terminal Design ◽  
Metal Interconnects

Three-terminal tandem solar cells can provide a robust operating mechanism to efficiently capture the solar spectrum without the need to current match sub-cells or fabricate complicated metal interconnects.

scholarly journals Water-soluble ZnSe/ZnS:Mn/ZnS quantum dots convert UV to visible light for improved Si solar cell efficiency

2021 ◽  
Author(s):  
Hisaaki Nishimura ◽  
Takaya Maekawa ◽  
Kazushi Enomoto ◽  
Naoteru Shigekawa ◽  
Tomomi Takagi ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Solar Cell ◽  
Visible Light ◽  
Solar Spectrum ◽  
Water Soluble ◽  
Solar Cell Efficiency ◽  
Cell Efficiency ◽  
Si Solar Cell ◽  
Si Solar Cells

The sensitivity of Si solar cells to the UV portion of the solar spectrum is low, and must be increased to further improve their efficiencies.

scholarly journals Highly efficient monolithic perovskite silicon tandem solar cells: analyzing the influence of current mismatch on device performance

2019 ◽  
Vol 3 (8) ◽  
pp. 1995-2005 ◽  
Author(s):  
Eike Köhnen ◽  
Marko Jošt ◽  
Anna Belen Morales-Vilches ◽  
Philipp Tockhorn ◽  
Amran Al-Ashouri ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Energy Yield ◽  
Device Performance ◽  
Tandem Solar Cell ◽  
Tandem Solar Cells ◽  
Highly Efficient

We present a highly efficient monolithic perovskite/silicon tandem solar cell and analyze the tandem performance as a function of photocurrent mismatch with important implications for future device and energy yield optimizations.

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.

The Suitability of Organic Solar Cells for Different Indoor Conditions

2010 ◽  
Vol 74 ◽  
pp. 170-175 ◽  
Author(s):  
Ben Minnaert ◽  
Peter Veelaert
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Light Intensity ◽  
Organic Solar Cells ◽  
Crystalline Silicon ◽  
Bulk Heterojunction ◽  
Solar Spectrum ◽  
Indoor Environments ◽  
Minimum Requirements ◽  
Indoor Conditions

Most commercially available photovoltaic solar cells are crystalline silicon cells. However, in indoor environments, the efficiency of Si-cells is poor. Typically, the light intensity under artificial lighting conditions is less than 10 W/m² as compared to 100-1000 W/m² under outdoor conditions. Moreover, the spectrum is different from the outdoor solar spectrum and there is more diffuse than direct light. Taken into account the predicted cheaper costs for the production of organic solar cells, a possible niche market for organic PV can be indoor applications. In this article, we study the properties and suitability of several bulk heterojunction organic solar cells (with distinct different absorption spectra) for different indoor conditions. We simulate different light environments and use a silicon solar cell as reference. Depending on the required power for the indoor device, we determine minimum requirements for the environment (light intensity and indoor spectrum) and for the organic solar cell (absorption spectrum and surface area). In this way we determine the appropriateness and conditions for a competitive indoor use of organic solar cells.

scholarly journals Fabrication and Study of Structural, Optical Features of Nano Structured, Photo-Harvesting Organo-Lead Halide-Based Perovskite Solar Cell

2018 ◽  
Author(s):  
Abhishek Dhar ◽  
Rohit L. Vekariya ◽  
Argha Dey ◽  
Subhasis Roy
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Alternative Energy ◽  
Large Scale ◽  
Energy Conversion Efficiency ◽  
Lead Chloride ◽  
Systematic Analysis ◽  
Alternative Energy Sources ◽  
Perovskite Material ◽  
Co Precipitation

In a world where conventional sources of energy are fast depleting, the quest for alternative energy sources may hold the key for the survival of humanity. In the present work, emphasis has been given to the idea of producing energy from perovskite based solar cells. In order to bring this idea into fruition, a unique and novel nano structured perovskite material n-propyl ammonium lead chloride (C3H7NH3+PbCl3⁻) was prepared through a unique co-precipitation route using n-propyl amine (n-C3H7NH2) and hydrochloric acid as the starting precursors with aqueous solution of Pb(CH3COO)23H2O. Finally acetic acid was added to the solution and this solution was allowed to concentrate and then gradually cooled down to room temperature. After math, the synthesized material was spin-coated on TiO2 film to fabricate the solar cell. The device was then undergone systematic analysis using XRD, SEM, UV and Photo Conversion to get a transparent idea regarding its structural, electrical and optical properties. When experimentally applied, this perovskite-based solar cell has shown energy conversion efficiency (η) of around 6.01 % which is noticeably good. Thus it can be concluded that this material is promising for fabrication of vastly efficient solar cells. This technology can be tried in large scale as an alternative of conventional energy in the near future.

scholarly journals A simulation of Gallium Indium Nitride Based Solar Cells

2020 ◽  
Author(s):  
Jin Wu
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Absorption Coefficient ◽  
Indium Nitride ◽  
Solar Spectrum ◽  
Thin Layers ◽  
Gallium Indium Nitride ◽  
Optimal Values ◽  
High Absorption Coefficient ◽  
High Absorption

InGaN can reach all values of bandgap from 3.42 to 0.7eV, which covers almost the entire solar spectrum. This study is to understand the influence of each parameter of the solar cell for an improved optimization of performance. The yield obtained for a reference cell is 12.2 % for optimal values of doping of the layers. For generation and recombination, performance of the cell varies with these settings. III nitrides have a high absorption coefficient, a very thin layers of material are sufficient to absorb most of the light.

Enhanced absorption in the space charge region of GaAs solar cells

2021 ◽  
Author(s):  
Yangfeng Li ◽  
Wenqi Wang ◽  
Chen Yue ◽  
Xiaotao Hu ◽  
Yimeng Song ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Absorption Coefficient ◽  
Space Charge ◽  
Space Charge Region ◽  
Solar Spectrum ◽  
Enhanced Absorption

Abstract The photo-generated currents of GaAs solar cells with different lengths of space charge region are obtained and analyzed in this study. The enhanced absorption coefficient in the space charge region is adopted to calculate the photo-generated current based on the solar cell physics theory. The calculated currents coincide well with the experimental currents both under single wavelength incidence and solar spectrum irradiation conditions.

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