High Efficiency and High Freedom Packaging Technique of Tandem Perovskite Solar Cell(2/3)

Perovskite solar cell (PSCs) becomes a super star in the photovoltaic field in recent years. Due to their high power conversion efficiency and low-cost fabricating process, it become a popular topic for solar cell. However, the low thermal stability and low water resistance of Perovskite result in poor reliability further limits their commercial possibility. To implement it in industrial application, The improvement of the intrinsic properties of PSCs、encapsulation issues and the high efficiency tandem solar cell must be developed simultaneously. This project aims on the electrode stability of PSCs modules: metal electrode diffusion barrier and developing new technology called “separated electrode fabrication-recombination process”. Using the concept of this technique to fabricate Perovskite module with high stability electrodes. After accomplishing the electrode stability of the component, we will develop high moisture resistance and low heat accumulation process packaging technique (1) the surface modification of filled colloidal. (2) development of waterproof interface. After completing the Perovskite module and the packaging process with high stability and reliability, and further stacking Perovskite solar cells and inorganic/inorganic solar cells, this project develops high-compatibility solid-state metal bonding technology to provide high-freedom selection of inorganic solar cell to complete high-efficiency tandem solar cell. Using this tandem cell technology, we establish a graph of the power conversion efficiency versus energy gap for the actual tandem cell, which is an important reference for future high-efficiency solar cells. The target of high efficiency plan in this project: according to the widely used single junction C-Si solar cells and commercial large area silicon solar cells have power conversion efficiency about 26 %~27 % and 22%~23%. Some of tandem silicon solar cell system has been proposed already. The power conversion efficiency of these tandem solar cell: 2T = 23.6 % ; 4T = 26.4 %, which approaches the recorded efficiency of silicon gradually. In addition, because of the mature III-V manufacturing process, III-V material such as GaInP is also common used with silicon in the tandem solar cell system with the power conversion efficiency with 30%. According to above, the 2T tandem solar cell have better performance in efficiency, and with concise package wire and less parasitic resistance effect. So, we decide to use 2T tandem method to complete the Perovskite/III-V tandem solar cell with an efficiency surpass 30% from reference. Finishing the III-V/c-Si tandem solar cell with efficiency about 35% by using high transparency metal bonding technique. Ultimately finish the Perovskite/III-V/c-Si tandem solar cell with efficiency about 40 %. This project bases on developing a Perovskite solar cell with a stable electrode, high transparency metal bonding technique and high water resistance efficiency technique, and complete the high efficiency tandem solar cell in final.