Abstract
In this work, nickel silicide was applied to tandem solar cells as an interlayer. By the process of thermal evaporation, a layer of NiOx, hole transport layer (HTL) was deposited on n+ poly-Si layer directly. Nickel silicide was simultaneously formed by nickel diffusion from NiOx to n+ poly-Si layer during the deposition and annealing process. The I–V characteristics of NiOx/n+ poly-Si contact with nickel silicide showed ohmic contact and low contact resistivity. This structure is expected to be more advantageous for electrical connection between perovskite top cell and TOPCon bottom cell compared to the NiOx/TCO/n+ poly-Si structure showing Schottky contact. Furthermore, nickel silicide and Ni-deficient NiOx thin film formed by diffusion of nickel can improve the fill factor of the two sub cells. These results imply the potential of a NiOx/nickel silicide/n+ poly-Si structure as a perovskite/silicon tandem solar cell interlayer.
Highlights
Received: 29 November 2021With great efforts from the photovoltaic (PV) research community, photoconversion efficiency (PCE) of silicon solar cells is almost close to the practically achievable limit of 27.1% [1] and the theoretical limit of 29.56% [2]
As the etching time increased, the nickel silicide peak shifted to the left. These results indicated that the nickel silicide phase shifted from Ni rich silicide to the NiSi phase, depending on the depth
In this study the contact between NiOx used as a hole transport layer of perovskite solar cell and n+ poly-Si of tunnel oxide passivated contact (TOPCon) solar cell was studied
Summary
Received: 29 November 2021With great efforts from the photovoltaic (PV) research community, photoconversion efficiency (PCE) of silicon solar cells is almost close to the practically achievable limit of 27.1% [1] and the theoretical limit of 29.56% [2]. In addition to increasing efficiency, silicon solar cells are reaching grid parity, while occupying about 95% of the PV market. The PCE of perovskite solar cells has risen sharply from 3.8% [5] to 25.5% [6] in only a few years. In addition to PCE, various fields have been studied about perovskite solar cells such as: long-term stability, vacuum deposition process, or conformal deposition technology [7,8,9]. Perovskite solar cell is suitable as the top cell of a tandem solar cell due to its band gap tunability over a wide range of 1.4–2.3 eV. Based on the well-commercialized market of silicon solar cells and the high PCE of perovskite solar cells with easy band gap control, 2-terminal (2-T)
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