[7] [8] [9] Furthermore, the photoconversion efficiency (PCE) of single OPVs over recent decades has remarkably increased up to values of 18.2%. [10, 11] [14] [15] [16] [17] To ensure long-term stability, various approaches such as single-layer and multilayer thin film encapsulation have been exploited to minimize the damage in highly sensitive OPVs caused by water and oxygen permeation. Representative examples include SiO x or Al 2 O 3 (inorganic), PVB (organic) or ORMOCER (inorganicorganic

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... rid) single layer, SiO x /SiN x , [18] Al 2 O 3 /SiO 2 (or ZrO 2 ) (inorganic) or organosilicon/SiO x , SiN x /Parylene, and SiO x /SiN x /Parylene (organic-inorganic) multilayer. [19] In general, various antireflection coatings (ARCs) can be categorized on the basis of the layer composition (single, double,