Nonlinear Band Gap Tunability in Selenium–Tellurium Alloys and Its Utilization in Solar Cells

In this Letter, we report the alloying of the high-band-gap photovoltaic elemental absorber selenium with the isomorphic low-band-gap semiconductor tellurium to tune the band gap energy of Se1–xTex to the optimal value for photovoltaic absorber. Photovoltaic devices based on crystalline Se1–xTex alloys are promising candidates for extremely cheap and highly scalable solar cells, offering simple low-temperature fabrication and intrinsic...