MONO-CRYSTALLINE SILICON SOLAR CELL FABRICATION IN BANGLADESH

Md.Asrafusjaman, Kutub Uddin, Galib Hashmi, Md. Abdur Rafiq Akand

Abstract: Bangladesh, a tropical country, undergoes an average daily irradiation of 5 kWh/m2 /day which indicates solar energy is strong in this region and converting this solar energy into electricity may be one of the crucial solutions to eradicate the power crisis in Bangladesh. As solar cell converts, solar energy into electricity, this paper presents fabrication of monocrystalline silicon solar cell in Bangladesh to utilize the 5 kWh/m2 /day irradiation. The fabrication of monocrystalline solar cell was done in Bangladesh Atomic Energy Commission (BAEC), solar cell research division laboratory. A p-type pseudo-square shaped silicon wafer (150×150 mm2 , mono crystalline silicon wafer, with 200µm thickness and <100> orientation was used in the present study for fabrication of solar cell. This paper also discussed about texturing and cleaning of the wafer, which was performed using different chemical solutions. The morphology of raw, cleaned and textured silicon wafer surface has been studied using scanning electron microscopy. Result shows, pyramid type structures are formed on the textured surface which reduces reflection and helps to trap more light. By using, liquid POCl3, phosphorous diffusion was carried out in a diffusion chamber to form p-n junction of solar cell. A screen printer was used for metallization process. Rapid thermal annealing (RTA) furnace was used for contact formation. Finally, the solar cells efficiency was measured by LIV (Light intensity-Current- Voltage) tester. Results show that, with an active surface area of 161 cm2 , monocrystalline solar cell has efficiency (?) of 6.89% and fill factor of 32.89%.

Keywords: Solar energy, Fabrication, Silicon wafer, Phosphorus diffusion, Efficiency

DOI: https://doi.org/10.15623/ijret.2016.0509028