A detailed balance analysis of conversion efficiencies limits for nanocrystal solar cells—Relating the shape of the excitonic peak to conversion efficiencies

2014 ◽  
Vol 115 (5) ◽  
pp. 054313 ◽  
Author(s):  
David T. Moore ◽  
Bernard Gaskey ◽  
Andrew Robbins ◽  
Tobias Hanrath
Keyword(s):  
Solar Cells ◽  
Detailed Balance ◽  
Excitonic Peak ◽  
Balance Analysis ◽  
Conversion Efficiencies

scholarly journals Detailed balance analysis of nanophotonic solar cells

2013 ◽  
Vol 21 (1) ◽  
pp. 1209 ◽  
Author(s):  
Sunil Sandhu ◽  
Zongfu Yu ◽  
Shanhui Fan
Keyword(s):  
Solar Cells ◽  
Detailed Balance ◽  
Balance Analysis

scholarly journals Highly Mismatched Alloys for Intermediate Band Solar Cells

2005 ◽  
Vol 865 ◽  
Author(s):  
W. Walukiewicz ◽  
K. M. Yu ◽  
J Wu ◽  
J. W. Ager ◽  
W. Shan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Ion Beam ◽  
Detailed Balance ◽  
Solar Cell Performance ◽  
Intermediate Band ◽  
Intermediate Band Solar Cell ◽  
Balance Analysis ◽  
Highly Mismatched Alloys ◽  
Limiting Efficiency

AbstractIt has long been recognized that the introduction of a narrow band of states in a semiconductor band gap could be used to achieve improved power conversion efficiency in semiconductor-based solar cells. The intermediate band would serve as a “stepping stone” for photons of different energy to excite electrons from the valence to the conduction band. An important advantage of this design is that it requires formation of only a single p-n junction, which is a crucial simplification in comparison to multijunction solar cells. A detailed balance analysis predicts a limiting efficiency of more than 50% for an optimized, single intermediate band solar cell. This is higher than the efficiency of an optimized two junction solar cell. Using ion beam implantation and pulsed laser melting we have synthesized Zn1-yMnyOxTe1-x alloys with x<0.03. These highly mismatched alloys have a unique electronic structure with a narrow oxygen-derived intermediate band. The width and the location of the band is described by the Band Anticrossing model and can be varied by controlling the oxygen content. This provides a unique opportunity to optimize the absorption of solar photons for best solar cell performance. We have carried out systematic studies of the effects of the intermediate band on the optical and electrical properties of Zn1-yMnyOxTe1-x alloys. We observe an extension of the photovoltaic response towards lower photon energies, which is a clear indication of optical transitions from the valence to the intermediate band.

scholarly journals The Influence of Solar Spectrum and Concentration Factor on the Material Choice and the Efficiency of Multijunction Solar Cells

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Daniel N. Micha ◽  
Ricardo T. Silvares Junior
Keyword(s):  
Solar Cells ◽  
Concentration Factor ◽  
Detailed Balance ◽  
Solar Spectrum ◽  
Theoretical Method ◽  
Balance Model ◽  
Bandgap Energy ◽  
Multijunction Solar Cells ◽  
Material Choice ◽  
Conversion Efficiencies

AbstractIn this work, we revisit the theoretical study on the conversion efficiency of series-connected multijunction solar cells. The theoretical method, based on the detailed balance model, is then applied to devices with 2 to 6 junctions under different illumination conditions. As results, (i) we show that the peaks in the efficiency distribution occur for recurrent values of bottom junction bandgap energy corresponding to atmospheric absorption in the solar spectrum, and (ii) we demonstrate that variations in the number of junctions, in the incident solar spectrum, and in the concentration factor lead to changes in the optimum bandgap energy set but that the bottom junction bandgap energy only changes among the recurrent values presented before. Additionally, we highlight that high conversion efficiencies take place for a broad distribution of bandgap energy combination, which make the choice of materials for the device more flexible. Therefore, based on the overall results, we propose more than a hundred III-V, II-VI and IV semiconductor material candidates to compose the bottom junction of highly efficient devices.

Detailed balance analysis of advanced geometries for singlet fission solar cells

2021 ◽  
Vol 119 (1) ◽  
pp. 013301
Author(s):  
Jeffrey C. F. Cheung ◽  
Loren G. Kaake
Keyword(s):  
Solar Cells ◽  
Detailed Balance ◽  
Singlet Fission ◽  
Balance Analysis

Light-Induced Degradation in Solar Cells with Hydrogenated Amorphous Silicon-Sulfur Active Layers

2002 ◽  
Vol 715 ◽  
Author(s):  
Wei Xu ◽  
P. C. Taylor
Keyword(s):  
Solar Cells ◽  
Practical Importance ◽  
Chemical Vapor ◽  
Photovoltaic Devices ◽  
Sulfur Concentration ◽  
Active Layers ◽  
Conversion Efficiencies ◽  
Hydrogenated Amorphous ◽  
Secondary Ion ◽  
Initial Conversion

AbstractWe have made a series of a-SiSx:H based solar cells, with a pin structure, in a multichamber plasma enhanced chemical vapor deposition (PECVD) system. The sulfur concentration ranges from zero to 5 x 1018 cm-3 as measured by secondary ion mass spectroscopy. The initial conversion efficiencies of cells in this series with sulfur concentrations ≤ 1018 cm-3 are approximately 7%. The time constants for degradation increase with increasing sulfur concentration, but not fast enough to be of practical importance in photovoltaic devices.

Nonfullerene acceptors for P3HT-based organic solar cells

2021 ◽  
Author(s):  
Shreyam Chatterjee ◽  
Seihou JINNAI ◽  
Yutaka Ie
Keyword(s):  
Solar Cells ◽  
High Power ◽  
Organic Solar Cells ◽  
Power Conversion ◽  
Conversion Efficiencies

Progressive advancement of remarkably high power conversion efficiencies (PCEs) of organic solar cells (OSCs) largely depends on the development of norfullerene acceptors (NFAs), revealing stupendous ability of OSCs to shift...

Conventional polymer solar cells with power conversion efficiencies increased to >9% by a combination of methanol treatment and an anionic conjugated polyelectrolyte interface layer

RSC Advances ◽  
2014 ◽  
Vol 4 (92) ◽  
pp. 50988-50992 ◽  
Author(s):  
Tao Yuan ◽  
Dong Yang ◽  
Xiaoguang Zhu ◽  
Lingyu Zhou ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Thin Layer ◽  
Polymer Solar Cell ◽  
Polymer Solar Cells ◽  
Power Conversion ◽  
Interface Layer ◽  
Conjugated Polyelectrolyte ◽  
Methanol Treatment ◽  
Conversion Efficiencies

The power conversion efficiency of a PTB7:PC71BM polymer solar cell was improved up to 9.1% by a combination of methanol treatment followed by conjugation of a water- or alcohol-soluble polyelectrolyte thin layer.

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