Optimization of laser processing for PERC type c-Si solar cells

Download

index.pdf

Date

2019

Author

Genç, Ezgi

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

345
views

129
downloads

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 way, the total recombination at the rear side of the wafer is significantly reduced, leading to a higher open-circuit voltage and charge collection efficiencies in the base of the cell. In this thesis, the experiments which mainly focus on rear local contact formation were conducted with a picosecond laser of 532 nm wavelength to create local contact openings (LCOs). To determine the best laser performance in LCO process, the contact characteristics such as Al:BSF depth, contact width after firing, void fraction were correlated to laser fluence. To see the effects of these contact characteristics on solar cell performance and determine an optimized fluence range, efficiencies of the solar cells that were produced for each fluence were compared. For more detail investigation, corresponding efficiencies were calculated using Quokka simulation. Subsequently, the laser ablation process was optimized for the PERC production in Günam Photovoltaic Line (GPVL) and %19 efficiency has been achieved for the industrial-scale.

Subject Keywords

Solar cells., Keywords: PERC type c-Si solar cells, Laser ablation process, Rear contact formation, Rear contact characteristics

URI

http://etd.lib.metu.edu.tr/upload/12623648/index.pdf
https://hdl.handle.net/11511/43920

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Comparative Evaluation of Rear Local Contact Patterns for P-Type Mono Crystalline Silicon PERC Solar Cell Asav, Hasan; Bektaş, Gence; Kececi, Ahmet Emin; Kokbudak, Gamze; Arikan, Bulent; Turan, Raşit (2020-01-01) © 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 o...
Optimization of fabrication steps for n-type c-Si solar cells Orhan, Efe; Ünalan, Hüsnü Emrah; Department of Metallurgical and Materials Engineering (2019) Crystalline silicon (c-Si) solar cells fabricated on p-type wafers are still dominating the photovoltaic (PV) industry due to advantages in device processing and early focus on p-type cells in the development phase of the industry. Over the years, studies on n-type Czochralski (CZ) substrates have shown that they can be more desirable for the terrestrial applications due to superior material and process advantages such as higher minority carrier lifetime, easier passivation of the surface, absence of light ...
OPTIMIZATION OF EMITTER LAYER IN N-TYPE BIFACIAL CRYSTALLINE SOLAR CELL Salimi, Yasaman; Turan, Raşit; Ünalan, Hüsnü Emrah; Department of Micro and Nanotechnology (2022-5-09) P-type solar cells currently hold most of the market share in industrial solar cell fabrication statistics. NREL's highest efficiency record for p-type crystalline perc cells is 22.8%. However, there is an ever-increasing interest in n-type wafers due to the many advantages they have against p-type cells. According to the ITRPV's estimation, the n-type cell structures will be taking half the industry's share by 2031. Compared to p-type cells, n-type cells yield better efficiency and lifetime values and are ...
Analysis of boron doped hydrogenated amorphous silicon carbide thin film for silicon heterojunction solar cells Salimi, Arghavan; Turan, Raşit; Department of Micro and Nanotechnology (2019) Silicon based solar cells are the dominant type of solar cells in the photovoltaic industry. Recently, there have been increasing efforts to develop c-Si solar cells with higher efficiency and lower cost. Among them, silicon heterojunction solar cell (SHJ) is attracting much attention because of its superior performance values demonstrated at both R&D and industrial levels. One of the common limiting criteria is the recombination at the front side which can be solved by providing proper passivation at the f...
Optimization of PERC fabrication based on loss analysis in an industrially relevant environment: First results from GUNAM photovoltaic line (GPVL) ES, FIRAT; SEMİZ, EMEL; Orhan, Efe; Genc, Ezgi; Kokbudak, Gamze; Baytemir, Gulsen; Turan, Raşit (Elsevier BV, 2020-02-01) Passivated emitter and rear cell (PERC) concept with an already developed roadmap for 24% efficiency will be leading the photovoltaics industry in the upcoming years. In a few industrial pilot lines, efficiencies above 22% have already been attained. Pilot lines have important roles in bridging lab scale proven concepts with the products which are ready for mass production. Therefore, GUNAM Photovoltaic Line which is specialized on PERC concepts has been established to overcome the barriers that hinder the ...

Citation Formats

E. Genç, “Optimization of laser processing for PERC type c-Si solar cells,” Thesis (M.S.) -- Graduate School of Natural and Applied Sciences. Micro and Nanotechnology., Middle East Technical University, 2019.