Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Current Concepts for Optical Path Enhancement in Solar Cells

: Sprafke, A.; Wehrspohn, R.


Wehrspohn, R.B.:
Photon management in solar cells
Weinheim: Wiley-VCH, 2015
ISBN: 3-527-41175-5
ISBN: 978-3-527-41175-7 (Print)
ISBN: 978-3-527-66569-3
ISBN: 978-3-527-66568-6
ISBN: 978-3-527-66567-9
ISBN: 978-3-527-66566-2 (Online)
Aufsatz in Buch
Fraunhofer IWM ( IMWS) ()

The conversion efficiency of a solar cell is directly connected to the number of photons absorbed in the absorber material of the cell. Therefore, it is of critical importance to insert as many photons as possible into the cell and keep them inside the cell until they are finally absorbed. While achieving the first aspect is referred to as antireflection, the second aspect is commonly called optical path enhancement, also known as light Trapping, which is the focus of this chapter. Light trapping in commercially available c-Si solar cells utilizes approaches that are based on ray optics. A common approach to achieve real light trapping is to change the propagation direction of the light such that total internal reflection occurs. A very effective light trapping concept is the full randomization of the propagation directions of the incident sunlight after hitting the first absorber interface.