It is the second part of a bipartite article. In this article, we want to compare two types of Tandem solar cells. Perovskite-Perovskite tandem solar cells (PPTSC) have three advantages compared to conventional photovoltaic cells, as well as perovskite-silicon tandem solar cells (PSTSC). They not only have fewer fabrication processes but also need lower energy for recycling at the end of their lifecycle. Moreover or most importantly for commercialization, they return the initial investment much faster than the conventional panels.
According to Cornell University, Cornell engineers have found that photovoltaic cells in solar panels with all-perovskite structures outperform photovoltaic cells made from state-of-the-art crystalline silicon, as well as PSTSC.
The rationale behind the built-up of tandem solar cells is to utilize a “larger portion of the sunlight spectrum”. In Conventional two-terminal (electrode) PSTSC, one perovskite layer is attached to another silicon solar cell. The top perovskite layer is responsible for generating a photocurrent by harnessing the short-wavelength light while the silicon layer uses long-wavelength light to generate charge carriers.
However, in the new design of cell layers, PPSTC, engineers have used two perovskite layers with the same duties.
This cell structure returns the investment 4.5 times faster than the PV modules with conventional photovoltaic cells. It takes only 4 months to PV modules made by PPSTC that return your initial investment. It is amazing for the exponential growth of solar power worldwide.
It is worth mentioning that tandem solar cells have two or four active layers for harnessing solar energy in spite of the conventional photovoltaic cell with only one active layer.
Source:@cornelluniversity & @Solar_Edition
Photo:@cornelluniversity & @Solar_Edition
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