The rival solar cell technology to crystalline silicon is called thin-film, which is itself an umbrella term that includes several solar cell materials, such as CdTe and CIGS, as well as amorphous silicon (a-Si).
The rival solar cell technology to crystalline silicon is called thin-film such as CdTe. The rival solar cell technology to crystalline silicon is called thin-CIGS, as well as amorphous silicon (a-Si). Film is itself an umbrella term. This umbrella term includes several solar cell materials.