CdTe solar cells have relied for decades on copper, which creates limited hole density, stability issues and a ceiling for voltage and efficiency. Now, Metzger et al. demonstrate As-doped Cu-free polycrystalline CdTe cells with enhanced hole density and dopant stability, achieving 20.8% efficiency.
- W. K. Metzger
- S. Grover
- M. Gloeckler
