Modeling and experimental verification of optical reflection in a thin film silicon solar cell implementing a multilayer porous silicon stack back reflector

摘要

A model is proposed for predicting the performance of thin film silicon solar cells made of an epitaxial layer grown on a porous silicon stack of layers with alternate (high/low) porosity and acting as a back reflector. The model first determines the optical properties of porous silicon in the stack. Escape reflectance and optical absorption in the solar cell are then determined using a model that takes into consideration the non-ideal diffuse nature of the plasma-textured front surface and traces the path of the light in the active layer. The AM 1.5 photogenerated current and the external quantum efficiency calculated using the proposed model for a typical demonstration cell are in close agreement with the experimental results.