Abstract
Liquid fluxes are used with tabbing ribbon to form a solder connection with the metallization paste of solar cell. Flux dissolves the oxides present on the surface of the tabbing ribbon as well as the silver bus bar on the top and bottom of the solar cell. With recent advances in automated tabbing and stringing machines, flux performance has increasingly becoming crucial and demanding. This paper reviews the new challenges that have emerged for liquid PV (photovoltaic) fluxes.Several existing issues and challenges are identified and discussed. The challenges were categorized into three main parts i.e. process, material and reliability. Each section is discussed at length and strategy to overcome the problems is proposed. More emphasis is given on pollution and peel strength related issues and approach to formulate next generation liquid fluxes. The analysis indicates that soldering fluxes with enough activity (under class “L” per IPC standard) and ultra fast wetting time are probably the best suit as next generation fluxes.
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