Solar cells light induced degradation,

In this paragraph we will briefly discuss the stability behavior of silicon thin film solar cells. Two aspects were considered light induced degradation and stability in hot and humid environment. 

As already mentioned in Sects. 6.3.1.2 and 8.2.3, ZnO can be used as an intermediate reflector in a-Si H/ j,c-Si H tandem solar cells between top and bottom cell to increase the current in the thin amorphous silicon top cell [14,15]. As a result, the thickness of the a-Si H top cell can be reduced to improve the stability of the cell upon light induced degradation. Recent progress has even lead to improved light utilization and higher short circuit current density by an optimized intermediate reflector [16]. However, this intermediate reflector might consist of another material than ZnO. 

Schmidt, J. Light-induced degradation in crystalline silicon solar cells. Diff. Defect Data B Solid State Phenom. 2004, 95-96, 187-196. 

Nasr C., Vinodgopal K, Fisher L., Hotchandani S., Chattopadhyay A.K., Kamat P.V. Environmental photochemistry on semiconductor surfaces. Visible light induced degradation of a textile diazo dye, naphthol blue black, on Ti02 nanopartilces. J. Phys. Chem. 1996 100 8436-8442 Nasr S., Hotchandani S., Kamat P.V. The role of iodide in photoelectrochemical solar cells. Electron transfer between iodide ions and ruthenium polypyridyl complex anchored on nanocrystalline Si02 andSnOz films. J. Phys. Chem. B 1998 102 4944-4951... 

The main aim of this study was to identify physical-chemical factors relevant for long-term stability or degradation of sensitizers of nanocrystalline ZnO and TiO solar cells to determine the influence of the adsorption site. The focus was on light-induced degradation. An analytical formula describing the nature of various... 

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