MANUFACTURING METHOD FOR SOLAR BATTERY SUBSTRATE, AND SOLAR BATTERY SUBSTRATE

摘要

This manufacturing method for a solar battery substrate comprising single-crystal silicon is characterized by comprising: a step for producing a silicon single-crystal ingot; a step for cutting out a silicon substrate from the silicon single-crystal ingot; and a step for low-temperature heat-treating the silicon substrate at a temperature of at least 800°C but less than 1200°C, wherein before the low-temperature heat-treatment, the silicon single-crystal ingot or the silicon substrate is high-temperature heat-treated for at least 30 seconds at a temperature of at least 1200°C. As a result, a manufacturing method for a solar battery substrate with which it is possible to prevent a reduction in the lifetime of the substrate, even if the oxygen concentration of the substrate is high, is provided.