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Efficiency degradation of crystalline silicon solar cells is known as a general phenomena in the photovoltaic (PV) applications. Degradation sometimes could be significant to result in failure of PV systems. It is presented in this work that electrical properties of multi-crystalline silicon solar cells (multi cells)degrades under different ambience, temperature, humidity and illumination condition etc. Periodical measurements were taken to demonstrate such trends in detail using various wafer materials. Degradation mechanisims are also discussed in this work, combined with the valid methods to reduce the degradation of multi cells based on current raw materials, equipments and processing technologies.

Optical losses or the effect of reflection from surface of light-matter devices have a significantly influence on their accuracy, reliability and efficiency. Solar cells, including silicon substrate solar cells or dye sensitized solar cells, are one of them. The simplest way to improve the efficiency of solar cells is introducing an anti-reflection coating. This paper investigates the performance of anti-reflection coating by introducing a composite material, using different deposition methods. It is found that the annealing temperature of single anti-reflection layer can reduce to 600 °C by using our recipe. Moreover, the efficiency of three layer anti-reflection coating is modeled by MATLAB to demonstrate the gradient refractive index theory.

High-density crystalline silicon modules have recently invoked large interest in PV industry due to its higher efficiency. However, high-density stacking of cells in this kind of module may have additional reliability problem, which might cause higher power loss during outdoor operation. Modules based on half-cut cells have been widely studied due to their higher power output compared with modules based on full cells. When a cell is half cut, its current level is half reduced. When it is 1/3 cut, its current level is decreased by 2/3. However, high-density modules based on 1/3-cut cells have rarely been studied. Therefore, in this work, damp heat (DH), thermal cycle (TC), UV irradiation and humidity freezing (HF) test were utilized to study the power degradation performance of these high-density modules fabricated with 1/3 cut cells. The obtained results show that these novel high-density modules with negative space between 1/3 cut cells have good reliability in various environmental conditions.