View into processing chamber during laser irradiation of silicon for the synthesis of black silicon. The inset shows a scanning electron micrograph of the surface in 5k magnification. Cone like spikes arise at the surface.
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Departments Fiber Optical Sensor Systems Nanomaterials for Energy Conversion Black Silicon
Departments Fiber Optical Sensor Systems Nanomaterials for Energy Conversion Black SiliconFiber Optical Sensor Systems Black Silicon
Processing of Black Silicon
Photograph of a silicon wafer. The femtosecond laser pulse irradiated surface area appears black.
Features of Black Silicon 1: Morphology
Scanning electron micrographs of black silicon surfaces obtained for increasing laser fluence and laser pulses per spot. The surface feature height is easily adjustable by laser parameters.
Features of Black Silicon 2: Absorption
Features of Black Silicon 2: Absorption
Absorption of Black Silicon and silicon.
=>Advantages of Black Silicon
- Usage of the whole solar radiation spectrum
- Potential to outperform the theoretical limit for single junction solar cells
- Processing in one single step
Advantages of Black Silicon
- Usage of the whole solar radiation spectrum, as absorbtion > 50% above 1100nm
- Potential to outperform the theoretical limit for single junction solar cells
- Processing in one single step
Solar radiation spectrum
(Kopie 1)
Application of Black Silicon 1: Multi-Junction Solar Cell
(Kopie 2)
Schematic cross section and back view of a multi-junction solar cell.
Application of Black Silicon 2: Black Silicon Solar Cell
Black silicon solar cell (left), surface structure and metal contacts (right).
Application of Black Silicon 3: Superhydrophobic Black Silicon Solar Cell
Drop of water on silicon (top), on Black silicon (Bottom).
Schematic structure of the electrode in the environment of an electrolyte in a fuel cell.