A generalized approach to modeling absorption and photocurrent in solar cells with light scattering structures

A generalized approach to modeling absorption and photocurrent in solar cells with light scattering structures

Year:2016
Author(s):Joseph Murray and Jeremy N. Munday
Citation(s):J. Appl. Phys. 120, 165304 (2016)

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Abstract: The spatial dependence of absorption in optical structures is important for determining the performance of optoelectronic devices, such as solar cells and photodetectors. When random scattering structures are introduced, the absorption can be difficult to calculate without direct simulation or broad simplifying assumptions. Here we present a theoretical framework for calculating the absorption in individual layers of arbitrary stratified media composed of any combination of coherent thin-films and/or incoherent thick slabs in the presence of randomizing scattering structures. This model allows for accurate predictions of generated carriers in photovoltaic systems. We discuss how these equations may be implemented to describe several common special cases as well as a few complex, non-traditional structures to show the wide range of applicability. Finally, we perform experiments on two multilayer structures with interlaced scattering layers to demonstrate utility and accuracy of the technique.