Abstract

The determination of the optical properties of encapsulant for photovoltaic modules is essential for cell-to-module (CTM) performance analysis, UV-durability studies and as input parameters of modelling tools. Some innovative polymer encapsulants used in heterojunction module manufacturing, such as polyolefin elastomer or thermoplastic polyolefin, show a non-negligible optical scattering behaviour in addition to refraction and absorption mechanisms, making challenging the extraction of optical properties in general, and optical indices in particular.

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