Investigation On Different Surface Modifications Using Laser Texturing

2017-09-29
Radfar, Behrad
Es, Fırat
Turan, Raşit
One of the important factors that determines the performance of a crystalline silicon solar cell is the surface structuring. Surface not only affects the electrical properties with recombination but also the optical properties via light trapping. To minimize reflection from the flat surface and improve light trapping, the crystalline silicon wafers must be textured. For monocrystalline Si cells, anisotropic alkaline etchants are commonly used to create pyramids on the surface. However, this method is not suitable for multi-crystalline Silicon due to grains of random crystallographic orientation. The aim of this study is to employ laser texturing which is an anisotropic texturing process as an alternative method for texturing multi-c solar cells. The approach utilizes a laser to create pits on the surface of multi-crystalline silicon wafers. The laser processing parameters are justified by performing series of experiments for different values of processing parameters. In order to determine the effectiveness of the process, the reflectance and Scanning Electron Microscopy (SEM) images of produced textures are taken into account. As a result, proper parameters for laser and laser motor is founded. The SEM images show that textures are deep enough to trap light inside and the reflection measurements indicate that samples have a low reflection.
33rd European Photovoltaic Solar Energy Conference and Exhibition (25-29 Eylül 2017)

Suggestions

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...
Investigation on Post Cleanings on Modified Surface Using Laser Texturing
Radfar, Behrad; Es, Fırat; Turan, Raşit (2018-09-28)
The surface of crystalline silicon (c-Si) solar cells can affect their performance as the surface can alter both electrical and optical properties. The c-Si texturing is carried out to increase the absorption; therefore, the optical properties will be enhanced. The anisotropic alkaline etchants are commonly used to form pyramids on the surface of monocrystalline Si wafers. However, this method is not usable for multi-crystalline silicon (mc-Si) because of its grains with random crystallographic orientations...
A numerical analysis of interdigitated back contacted silicon solar cells
Acar, Beran; Yerci, Selçuk; Turan, Raşit; Department of Electrical and Electronics Engineering (2018)
The state-of-the-art solar cells manufactured using crystalline silicon (c-Si) are highly cost-effective, competing with fossil fuel-based energy sources. However, relatively more complex cell structures (i.e. interdigitated back contact, IBC) need to be developed to further increase the efficiency/cost ratio. In this thesis, the effects of structural parameters such as cell dimensions, metal contact geometry and contact resistances on the efficiency of IBC and bifacial IBC silicon solar cells were studied ...
Imaging solar cells using terahertz waves
Kayra, Seda; Altan, Hakan; Department of Physics (2011)
In this thesis, Terahertz Time-Domain spectroscopy (THz-TDS) was used in order to measure the electrical properties of silicon solar cells. The advantage of THz-TDS is that it allows us to measure the electrical properties without electrical contacts. In order to perform these measurements, a reflection based system was constructed and the changes in the peak amplitude in the time-domain under a, 450mW 808 nm continuous wave laser source were measured. The solar cell that was used in this thesis was manufac...
Effect of Laser Parameters and Post-Texturing Treatments on the Optical and Electrical Properties of Laser Textured c-Si Wafers
RADFAR, Behrad; ES, FIRAT; NASSER, Hisham; AKDEMİR, Ozan; Bek, Alpan; Turan, Raşit (2018-03-21)
Surface plays a crucial role in the performance of crystalline silicon (cSi) based solar cells as it affects both electrical and optical properties. To minimize reflection from the flat surface and thus improve light trapping, the cSi wafers must be textured. For mono-cSi cells, anisotropic alkaline etchants are commonly utilized to create pyramids on the surface. However, this method is not viable for multi-crystalline silicon (mc-Si) wafers due to the presence of different and random crystallographic orie...
Citation Formats
B. Radfar, F. Es, and R. Turan, “Investigation On Different Surface Modifications Using Laser Texturing,” presented at the 33rd European Photovoltaic Solar Energy Conference and Exhibition (25-29 Eylül 2017), 2017, Accessed: 00, 2021. [Online]. Available: http://www.eupvsec-proceedings.com/proceedings?paper=43629.