According the The Johanna Solar Website , the owners of the technology:
- Thin film solar modules are based – as the name suggests – on a wafer-thin semi-conducting absorber layer.
- Our unique semiconductor made of copper, indium, gallium, sulphur and selenium is just 3 µm thick – half the thickness of a hair and almost one hundred times thinner than a silicon cell. This saves on raw materials.
But thin film solar modules also offer further advantages:
- The conversion of a broader light spectrum means that electricity is generated even under low light conditions.
- Due to the construction of the cells comparatively high yields can be obtained even under conditions of partial shadow.
- Due to improved temperature coefficients – which means lower loss of performance at high temperatures – thin film modules are especially suited to temperatures over 25 degrees Celsius.
- Integrated production – from glass pane to solar moduleIn the first production step, a wafer-thin layer of molybdenum is applied to a glass pane. This layer forms the back contact of the cells. The actual semiconductor only emerges in subsequent process steps.
- Over this, the precursor layer consisting of copper, indium and gallium is first applied.
- These three elements are then chemically transformed in a diffusion process under a gaseous atmosphere containing sulphur and selenium.
- The result is a unique crystalline coating – the CIGSSe absorber layer. It guarantees the high performance level of our modules.
- The electrical serial connection of individual cells into a module is realised during the coating process by structuring individual layers.
- This structuring gives rise to the typical "pinstripe" design of the thin film modules.
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