Tuning the Work Function of the Metal Back Contact toward Efficient Cu 2 ZnSnSe 4 Solar Cells

Solar RRL ◽  
2020 ◽  
pp. 2000391
Author(s):  
Dongxiao Wang ◽  
Jianyu Wu ◽  
Hongling Guo ◽  
Moqing Wu ◽  
Li Wu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Work Function ◽  
Back Contact ◽  
Metal Back

scholarly journals Dipole-field-assisted charge extraction in metal-perovskite-metal back-contact solar cells

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiongfeng Lin ◽  
Askhat N. Jumabekov ◽  
Niraj N. Lal ◽  
Alexander R. Pascoe ◽  
Daniel E. Gómez ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dipole Field ◽  
Back Contact ◽  
Charge Extraction ◽  
Metal Back

Enhanced Light Absorption in a-Si:H Layers of Solar Cells by Applying Tco/Metal Back Contacts

1993 ◽  
Vol 297 ◽  
Author(s):  
G. Tao ◽  
B.S. Girwar ◽  
G.E.N. Landweer ◽  
M. Zeman ◽  
J.W. Metselaar
Keyword(s):  
Solar Cells ◽  
Metal Layer ◽  
Spectral Response ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Short Circuit Current Density ◽  
Back Contact ◽  
Flat Substrate ◽  
Metal Layers ◽  
Metal Back

The optimization of the back contact reflectivity for thin film a-Si:H solar cells has been performed. The results of optical calculations show that a-Si:H/TCO/Metal interfaces with a proper TCO thickness reflect much more than their a-Si:H/Metal counterparts. We compared solar cells which were deposited on a flat substrate with different back contacts. The back contacts consisted of a metal layer (aluminum, silver/aluminum) or combined TCO/metal layers (TCO/Al, TCO/Ag/Al). The same was done with solar cells which were deposited on a textured substrate. The solar cells with a TCO/metal back contact showed not only a significantly increased short-circuit current density but also an increase in the spectral response. The cells with TCO/Ag/Al back contact showed the best result.

MoOx as an Efficient and Stable Back Contact Buffer for Thin Film CdTe Solar Cells

2012 ◽  
Vol 1447 ◽  
Author(s):  
Hao Lin ◽  
Wei Xia ◽  
Hsiang N. Wu ◽  
Ching W. Tang ◽  
Irfan Irfan ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Work Function ◽  
High Efficiency ◽  
Surface Cleaning ◽  
Back Contact ◽  
Metal Electrodes ◽  
Low Resistance ◽  
Cdte Solar Cells ◽  
Cell Stability

ABSTRACTA low-resistance back contact for n-CdS/p-CdTe solar cells has been developed, which utilizes a thermally evaporated MoOx thin film as the buffer layer between the p-CdTe and the back electrode. The low-resistance behavior of back contact is attributed to the high work function of MoOx, which reportedly is as high as 6.8 eV, and thus adequately matches that of p-CdTe. With MoOx as the buffer, a variety of common metals, even those with a low work function such as Al, have been found to be useful as the electrode in forming the back contact. Other advantages of the MoOx buffer include dry application by vacuum deposition, and thus it is particularly suitable for the fabrication of ultra-thin CdTe solar cells without introducing additional shorting defects. Surface cleaning of CdTe films prior to MoOx deposition has also been studied. The cell stability has been evaluated through thermal annealing tests. Thermal degradation has been explained in terms of oxidation of the metal electrodes. CdTe cells with high efficiency and good stability have been demonstrated with MoOx as the back contact buffer and Ni as the electrode.

Investigation of Parasitic Absorption in Back Contact of CdTe Solar Cells

2018 ◽  
Author(s):  
Joshua Smay ◽  
Ola Rashwan ◽  
James Then ◽  
Darien Perez
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Solar Cell ◽  
Absorption Efficiency ◽  
Absorber Layer ◽  
Thin Film Solar Cells ◽  
Infrared Range ◽  
Back Contact ◽  
Back Reflector ◽  
Metal Back

Thin film solar cells (TFSC) differ from the conventional wafer solar cell panels in that they are a fraction of the thickness, hence they boast reduced material costs, lighter weight, and possible flexibility. To improve their light-trapping and absorption efficiency, manufacturers currently use nanometer scale texturing. When manufacturing nano textured thin film solar cells in the substrate configuration, the back reflector is also textured. It has been observed that a textured back reflector leads to parasitic light absorption in silicon solar cells. This occurrence reduces the back reflector effectiveness, and thus reduces absorption in the absorber layer and overall efficiency. However, there is little to no similar research done for thin film (CdTe/CdS) solar cells devices. In this work, wave optical analyses of thin film CdTe/CdS solar cells with and without nano texturing on the metal back reflectors were simulated using ANSYS ANSOFT High Frequency Structural Simulator (HFSS). The optical analyses yielded percentage absorptions for unit cells with four absorber thicknesses range between 250- to 1000 nm, with and without a textured back reflector over six wavelengths range from 360nm to 860 nm, and with 3 different back contact metals (Au, Ag, and Al). It was noted that the textured back contacts show a substantial increase in the absorption in the active CdTe layer in the infrared range. Additionally, back reflector texturing increases the parasitic absorption in the metal back reflector layer as well, especially with ultrathin absorber layer. It was also found that additional parasitic absorption due to a textured back reflector has less of an impact on absorption as the active absorber thickness increases to 500 nm, 750 nm, or 1000 nm. Finally, silver (Ag) as back contact outperforms both aluminum (Al) and gold (Au). This finding might be crucial to solar cell manufacturers because it could possibly be an overlooked factor in achieving higher efficiencies for relatively thin cells.

The potential of textured front ZnO and flat TCO/metal back contact to improve optical absorption in thin Cu(In,Ga)Se2 solar cells

2007 ◽  
Vol 515 (15) ◽  
pp. 5968-5972 ◽  
Author(s):  
A. Čampa ◽  
J. Krč ◽  
J. Malmström ◽  
M. Edoff ◽  
F. Smole ◽  
...  
Keyword(s):  
Solar Cells ◽  
Optical Absorption ◽  
Back Contact ◽  
Metal Back

Optimized analysis of back-contact perovskite solar cells architectures

Optik ◽  
2020 ◽  
Vol 207 ◽  
pp. 164362 ◽  
Author(s):  
Guochuan Fang ◽  
Hanmin Tian ◽  
Weihong Chang ◽  
Zheng Wang ◽  
Quanmin He ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Back Contact
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