The invention discloses a photovoltaic solder strip and a preparation method therefor. The photovoltaic solder strip comprises a base material and a
tin lead alloy solder coated on the base material;and the
tin lead alloy solder comprises 0.05-0.5% of
copper, 0.1-1% of silver and 0.01-0.05% of
phosphorus. By virtue of the
copper, silver and
phosphorus elements added to the
tin lead alloy solder,the oxidization resistance, the wettability and release force intensity of the photovoltaic solder strip can be improved; meanwhile, the resistivity of the photovoltaic solder strip is lowered by 9.8%, equivalently, the power of a photovoltaic
assembly is improved by about 0.8W, so that loss of
photoelectric conversion efficiency caused by loss of resistance power can be lowered; the
copper, silver and
phosphorus elements have relatively high intermiscibility, so that
corrosion of a tin liquid to the added copper and silver elements can be suppressed, and a phenomenon of insufficient solder ofthe battery piece can be avoided; the
surface layer of the photovoltaic solder strip is rich in phosphorus-tin
alloy, so that an effect of lowering the partial temperature of a
soldering point in battery piece
soldering also can be played, thereby facilitating
soldering; and in addition, the photovoltaic solder strip has simple preparation method, low cost, easy operation and implementation, no environmental
pollution, and convenience in realizing industrial production and application.