Flexible Thin Film Amorphous and Microcrystal-line Silicon Tandem Modules in the Temporary Superstrate Concept

摘要

Flexible thin-film amorphous (a-Si:H) and microcrystalline (μc-Si:H) solar cells were deposited on flexible substrates in the so-called temporary superstrate concept: an aluminum foil functioned as low-cost, high-temperature resistant superstate during the deposition of the TCO, the p-i-n structure and the back contact, and was removed by wet-chemical etching after transfer of the solar cell structure to a permanent polymer substrate. Monolithically series connected modules reached initial aperture area solar energy conversion efficiencies of up to 9%. We conclude that this approach combines a high conversion efficiency with a low-cost roll to roll production process, and is thus a promising route to continue on.