The difference between perovskite cells and topcon cells

TOPCon cells and heterojunction (HJT/HIT) cells are both traditional crystalline silicon cells, which are the second-generation photovoltaic cell technology, while perovskite cells are the representatives of the third-generation non-silicon thin-film cells.
The perovskite/crystalline silicon stacked cell is a combination of these two technical routes. It is a double-junction solar cell formed by superimposing perovskite solar cells and traditional crystalline silicon solar cells. Simply put, it refers to connecting perovskite cells in series on the surface of crystalline silicon cells.
At present, pure perovskite cells have not completely overcome the problem of too fast efficiency decay, and perovskite/crystalline silicon stacked cells are expected to become the best industrial landing technology.
From the performance point of view, the perovskite/crystalline silicon stacked cell has broadened the absorption spectrum through the advantages of the combination, and obtained a higher photoelectric conversion efficiency than pure crystalline silicon cells or perovskite cells, and the theoretical conversion efficiency can exceed 30%.
In terms of theoretical limit conversion efficiency, the limit efficiencies of HJT, TOPCon, and perovskite single-layer cells are 27.5%, 28.7%, and 31%, respectively.
It is worth noting that perovskite/crystalline silicon stacked cells are expected to create more possibilities for heterojunction cells represented by HJT. This is because both heterojunction cell technology and perovskite cell technology belong to low-temperature processes, the production equipment of the two technologies is highly compatible, and heterojunction cells are double-sided power generation, and they have thin-film processes themselves.
Therefore, perovskite technology is easier to stack on the basis of heterojunction cells. TOPcon cell technology belongs to high-temperature processes, and it does not have a transparent conductive film itself. The difficulty of superimposing perovskite technology is naturally higher than heterojunction technology.
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