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Abstract

Thin film photovoltaic modules that include strings of thin film cells laminated between a transparent flexible barrier layer and a multi-layer backsheet configured to stabilize the module and to reduce or control thermo-mechanical stresses leading to undesirable effects such as warping and ribbon buckling, among others. In some cases, the backsheet has an effective TEC that relatively closely matches the TEC of the cells, resulting in improved module stability. Alternatively or in addition, the backsheet may include one or more relatively thick flexible layers, again resulting in improved stability. Various materials may be used with TECs that are chosen to minimize a particular thermo-mechanical stress, and/or to provide a module with a predetermined amount of curvature.

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First Claim