Exfoliated ∼25μm Si Foil for Solar Cells with Improved Light-Trapping

2013 ◽  
Vol 1493 ◽  
pp. 51-58 ◽  
Author(s):  
S. Saha ◽  
E. U. Onyegam ◽  
D. Sarkar ◽  
M. M. Hilali ◽  
R. A. Rao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Optical Absorption ◽  
Amorphous Silicon ◽  
Current Density ◽  
Surface Passivation ◽  
Light Trapping ◽  
Rear Surface ◽  
Front Surface ◽  
Absorption Enhancement ◽  
Back Surface

ABSTRACTInvestigation of optical absorption in ∼25μm thick, monocrystalline silicon (Si) substrates obtained from a novel exfoliation technique is done by fabricating solar cells with single heterojunction architecture (without using intrinsic amorphous silicon layer) with diffused back junction and local back contact. The ease of process flow and the rugged and flexible nature of the substrates due to thick metal backing enables use of various light-trapping and optical absorption enhancement schemes traditionally practiced in the industry for thicker (>120μm) substrates. Optical measurement of solar cells using antireflective coating, texturing on both surfaces, and back surface dielectric/metal stack as mirror to reflect the long wavelength light from the back surface show a very low front surface reflectance of 4.6% in the broadband spectrum (300nm-1200nm). The illuminated current voltage (IV) and external quantum efficiency (EQE) measurement of such solar cell shows a high integrated current density of 34.4mA/cm2, which implies significant internal photon reflection. Our best cell with intrinsic amorphous silicon (i-a-Si) layer with only rear surface textured shows an efficiency of 14.9%. EQE data shows improved blue response and current density due to better front surface passivation. Simulations suggest that with optimized light trapping and surface passivation, such thin c-Si cells can reach efficiencies >20%.

Broadband Absorption Enhancement in Thin Film Solar Cells Using Inverse Optimization of Light Trapping Mechanisms

2012 ◽  
Author(s):  
Shima Hajimirza ◽  
Alex Heltzel ◽  
John Howell
Keyword(s):  
Thin Film ◽  
Absorption Spectrum ◽  
Solar Cells ◽  
Indium Tin Oxide ◽  
Rear Surface ◽  
Front Surface ◽  
Optimization Techniques ◽  
Absorption Enhancement ◽  
Back Surface ◽  
Metallic Gratings

In this paper, global optimization techniques are used to design broadband solar absorption enhancement in thin film amorphous silicon (a-Si) solar cells, using periodic nanostructures on the top and bottom surfaces of the cell. Considering a combination of silver rectangular gratings and indium tin oxide (ITO) coatings on both surfaces of the a-Si, numerical optimization techniques such as Simulated Annealing and a local constrained Quasi-Newton algorithm are used to optimize the surface texture patterns. Numerical results indicate that, unlike the case of metallic gratings on the front surface, a periodic silver grating structure on the back surface results in a modification of the absorption spectrum largely independent of the effect of anti-reflection ITO coatings on the front of the cell. Furthermore, additional improvement can be obtained by using a thin rear surface ITO layers. Therefore, using a combination of metallic gratings and ITO coatings on both sides, a wideband absorption spectrum enhancement is achievable. Simulations predict integrated enhancement factors as high as 2.0 (100% improvement) for the case of metallic grating on the back surface and ITO layers on the front, and as high as 2.2 (120% improvement) when a combination of grating and ITO coatings on both sides is used. Such noteworthy improvements are made possible by efficient multi-parameter optimization supplanting an intractable exhaustive search.

Efficient optical absorption enhancement in organic solar cells by using a 2-dimensional periodic light trapping structure

2014 ◽  
Vol 104 (24) ◽  
pp. 243904 ◽  
Author(s):  
Feng-Shuo Zu ◽  
Xiao-Bo Shi ◽  
Jian Liang ◽  
Mei-Feng Xu ◽  
Chun-Sing Lee ◽  
...  
Keyword(s):  
Solar Cells ◽  
Optical Absorption ◽  
Organic Solar Cells ◽  
Light Trapping ◽  
Absorption Enhancement

Effect of the Back Surface Reflector and Passivated Rear Contacts With PERT Solar Cells

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Nordine Sahouane ◽  
Abdellatif Zerga ◽  
Zeggai Oussama
Keyword(s):  
Solar Cells ◽  
Light Trapping ◽  
Rear Surface ◽  
Surface Recombination ◽  
Single Layer ◽  
Back Surface ◽  
Physical Factors ◽  
Improved Performance ◽  
Rear Surface Recombination ◽  
Interface Passivation

We use Silvaco software (atlas tcad) simulation to investigate the effect of dielectric layer deposed on rear surface of solar cells passivated emitter and rear totally diffused (PERT). For an improved performance for this solar cell, several physical factors must be considered, such as the light trapping behavior, and the resulting passivation performance and rear surface recombination currents were investigated. Particular consideration will be given to the back surface reflector (BSR) impact on reflection surface, interface passivation, and on the I–V characteristics. Numerical simulations show that using a layer of two dielectrics (SiNx/SiO2) with optical indices and thickness optimized in combination with contacts located (optimized metallization fraction f) at the rear surface allow for energy conversion efficiencies of 21.26% compared to a single layer of dielectric SiN 21.01%.

scholarly journals Design of Grating Al2O3 Passivation Structure Optimized for High-Efficiency Cu(In,Ga)Se2 Solar Cells

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4849
Author(s):  
Chan Hyeon Park ◽  
Jun Yong Kim ◽  
Shi-Joon Sung ◽  
Dae-Hwan Kim ◽  
Yun Seon Do
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Rear Surface ◽  
Maximum Efficiency ◽  
Structural Factors ◽  
Carrier Recombination ◽  
Cigs Solar Cells ◽  
Effective Carrier ◽  
Opening Width

In this paper, we propose an optimized structure of thin Cu(In,Ga)Se2 (CIGS) solar cells with a grating aluminum oxide (Al2O3) passivation layer (GAPL) providing nano-sized contact openings in order to improve power conversion efficiency using optoelectrical simulations. Al2O3 is used as a rear surface passivation material to reduce carrier recombination and improve reflectivity at a rear surface for high efficiency in thin CIGS solar cells. To realize high efficiency for thin CIGS solar cells, the optimized structure was designed by manipulating two structural factors: the contact opening width (COW) and the pitch of the GAPL. Compared with an unpassivated thin CIGS solar cell, the efficiency was improved up to 20.38% when the pitch of the GAPL was 7.5–12.5 μm. Furthermore, the efficiency was improved as the COW of the GAPL was decreased. The maximum efficiency value occurred when the COW was 100 nm because of the effective carrier recombination inhibition and high reflectivity of the Al2O3 insulator passivation with local contacts. These results indicate that the designed structure has optimized structural points for high-efficiency thin CIGS solar cells. Therefore, the photovoltaic (PV) generator and sensor designers can achieve the higher performance of photosensitive thin CIGS solar cells by considering these results.

scholarly journals Influence of the Front Surface Passivation Quality on Large Area n-Type Silicon Solar Cells with Al-Alloyed Rear Emitter

2011 ◽  
Vol 8 ◽  
pp. 487-492 ◽  
Author(s):  
F. Book ◽  
T. Wiedenmann ◽  
G. Schubert ◽  
H. Plagwitz ◽  
G. Hahn
Keyword(s):  
Solar Cells ◽  
Surface Passivation ◽  
Front Surface ◽  
Silicon Solar Cells ◽  
Large Area ◽  
Type Silicon

Comprehensive rear surface passivation of superstrate Sb2Se3 solar cells via post-deposition selenium annealing treatments and the application of an electron blocking layer

2021 ◽  
Author(s):  
Giuk Jeong ◽  
Seunghwan Ji ◽  
Ji Woon Choi ◽  
Gihun Jung ◽  
Byungha Shin
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Grain Boundaries ◽  
Carrier Transport ◽  
Surface Passivation ◽  
Rear Surface ◽  
Blocking Layer ◽  
Electron Blocking Layer ◽  
Light Absorber ◽  
Post Deposition

Sb2Se3, a quasi-1D structured binary chalcogenide, has great potential as a solar cell light absorber owing to its anisotropic carrier transport and benign grain boundaries when the absorber layer is...

Enhanced light trapping in thin amorphous silicon solar cells by directionally selective optical filters

2010 ◽  
Author(s):  
Carolin Ulbrich ◽  
Marius Peters ◽  
Muhammad Tayyib ◽  
Benedikt Blaesi ◽  
Thomas Kirchartz ◽  
...  
Keyword(s):  
Solar Cells ◽  
Amorphous Silicon ◽  
Light Trapping ◽  
Optical Filters ◽  
Silicon Solar Cells

Enhanced light-trapping in laser-crystallised silicon thin-film solar cells on glass by optimised back surface reflectors

Solar Energy ◽  
2017 ◽  
Vol 150 ◽  
pp. 477-484 ◽  
Author(s):  
Mohd Zamir Pakhuruddin ◽  
Jialiang Huang ◽  
Jonathan Dore ◽  
Sergey Varlamov
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Light Trapping ◽  
Thin Film Solar Cells ◽  
Back Surface ◽  
Silicon Thin Film
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