Comparative Evaluation of Rear Local Contact Patterns for P-Type Mono Crystalline Silicon PERC Solar Cell

2020-01-01
Asav, Hasan
Bektaş, Gence
Kececi, Ahmet Emin
Kokbudak, Gamze
Arikan, Bulent
Turan, Raşit
© 2020 IEEE.The passivated emitter and rear cell (PERC) is an advantageous type of solar cell to reduce rear surface recombination [1] along with its improved back surface reflectivity [2]. Therefore, many research and developments have been taking place on this type of solar cell to increase the overall solar cell performance. In this study, different type of rear local contact opening patterns (line and dash) formed by industrial-Type picosecond laser which has 532 nm wavelength with fixed laser contact opening (LCO) width on M2 p-Type mono commercial blue wafers. Manufactured cells are investigated in terms of photovoltaic parameters depending on the rear metal fractions. We ablate rear dielectric passivation layer with 4 different LCO patterns by varying rear local contact pitches from 900 μm to 1200 μm by an increment of 100 μm using (1:1) dash pattern. Line pattern is used as reference pattern, which has 1500 μm line pitch and same contact width. Laser opening areas are analyzed by photoluminescence (PL) images as well as implied open circuit voltage (iVoc) measurements. Local contacts and formation of back surface field (BSF) has been analyzed by using scanning electron microscopy (SEM) for all types of LCOs after screen printing of aluminum paste. As a result, rear contact pattern with 3.19% metal fraction (1000 μm pitch) is found to be relatively more efficient than the others investigated in this study. When compared to reference line pattern, the optimized LCO pattern provides a gain in conversion efficiency of 0.35%, Voc of 6 mV and FF of 0.35 % on average.
2nd International Conference on Photovoltaic Science and Technologies, PVCon 2020

Suggestions

Optimization of laser processing for PERC type c-Si solar cells
Genç, Ezgi; Turan, Raşit; Department of Micro and Nanotechnology (2019)
Passivated Emitter Rear Contact (PERC) type solar cells, which currently owns a similar market share as the standard type solar cells, is expected to be the dominant type of the photovoltaic (PV) market in near future (ITRPV, 2019) due to its high performance/cost ratio. Hence, it is critical to optimize PERC process steps to achieve higher efficiencies. In PERC concept, the stack of a passivation layer and SiNx capping layer is locally ablated to form low recombination and low resistive contacts. In this w...
DESIGN, FABRICATION AND CHARACTERIZATION OF INTERDIGITATED BACK CONTACT SOLAR CELLS
Ciftpinar, Emine Hande; Turan, Raşit; Yerci, Selçuk; Department of Micro and Nanotechnology (2022-4-22)
The design and development of high-efficiency interdigitated back contact (IBC) solar cells have been studied within the scope of this thesis. Developing a totally industry-compatible, lithography-free, high-throughput process flow for IBC cell fabrication was the main motivation of the thesis. For this, a detailed simulation study was conducted using Quokka 2 software to optimize the rear side cell geometry and understand the effect of bulk and layer properties on the device performance. After determining ...
Comparison of crystal Si solar cells fabricated on p-type and n-type float zone silicon wafers
Bilgen, Makbule; Turan, Raşit; Department of Physics (2013)
Solar cells are traditionally fabricated on p-type Si substrates due to the high electron diffusion length in p-type substrate. However, high quality float zone silicon wafers provide higher carrier life time for holes in the n-type substrates, making it possible to fabricate high efficiency solar cells in this type of substrate. Superior properties of n-type substrates have created a tendency towards fabrication of n-type solar cells in photovoltaic market technology considerably. It is even forecasted tha...
Characterization and contact resistivity studies of ito thin films for use in silicon heterojunction solar cells
Güler, Seçil; Erçelebi, A. Çiğdem.; Department of Physics (2020)
Transparent conductive oxides (TCO) are widely used in optoelectronic devices such as flat panel displays and solar cells. Indium tin oxide, due to its wide optical bandgap and high transmittance in the visible spectrum, is commonly used for device applications such as anti-reflective coating, front TCO layer in silicon heterojunction solar cells. When ITO is used as TCO layer, the carrier transport mechanism through the junction is improved due to the decrease in the free carrier absorption. In this study,...
Comparison of influence of gold contamination on the performances of planar and three dimensional c-Si solar cells
Baytemir, Gulsen; Es, Firat; Turan, Raşit (2019-11-01)
Radial junction solar cell is proposed as an alternative device geometry to planar junction solar cell due to its superior electro-optical performance. In this geometry, densely-packed micropillars enable the collection of minority carriers in the radial direction. Thus, the distance that carriers should travel to reach the p-n junction is shortened, allowing the use of low quality materials with poor carrier lifetime. In this study, we have experimentally studied the advantage of radial junction approach i...
Citation Formats
H. Asav, G. Bektaş, A. E. Kececi, G. Kokbudak, B. Arikan, and R. Turan, “Comparative Evaluation of Rear Local Contact Patterns for P-Type Mono Crystalline Silicon PERC Solar Cell,” presented at the 2nd International Conference on Photovoltaic Science and Technologies, PVCon 2020, Ankara, Türkiye, 2020, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85129687801&origin=inward.