A high efficiency stacked solar cell

Abstract

The present disclosure provides a photovoltaic device that has a photon receiving surface and a first single homojunction silicon solar cell. The first single homojunction silicon solar cell comprises two doped silicon portions with opposite polarities and has a first bandgap. The photovoltaic device further comprises a second solar cell structure that has an absorber material with a Perovskite structure and has a second bandgap that is larger than the first bandgap. The photovoltaic device is arranged such that each of the first and second solar cells absorb a portion of the photons that are received by the photon receiving surface.

Description

technical field [0001] The present invention broadly relates to photovoltaic devices comprising a plurality of stacked solar cells. Background technique [0002] The cost of silicon solar cells has dropped dramatically over the past few years, and it can be expected that silicon technology will remain firmly the dominant photovoltaic technology for the next decade. Improvements in the conversion efficiency of such solar cells will continue to be a decisive factor. However, solar cells based on single junction silicon have a theoretical efficiency limit of 29%, and record efficiencies of about 25% have been demonstrated based on laboratory solar cells. [0003] In order to further improve the efficiency of silicon-based solar cells, the most feasible method is to stack cells of different materials on top of silicon-based solar cells. By stacking additional solar cells on a silicon-based solar cell, the theoretically possible performance can be increased from 29% to 42.5%. ...

AI Technical Summary

Problems solved by technology

However, solar cells based on single junction silicon have a theoretical efficiency limit of 29%, and record efficiencies of around 25% have been demonstrated based on laboratory solar cells

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