Richard Haight, Joel A. Silberman
IEEE JQE
Band alignment is critical to the performance of heterojunction thin film solar cells. In this letter, we report band alignment studies of SnS/Zn(O,S) heterojunctions with various compositions of Zn(O,S). Valence band offsets (VBOs) are measured by femtosecond laser pump/probe ultraviolet photoelectron spectroscopy (fs-UPS) from which conduction band offsets (CBOs) are calculated by combining with band gaps obtained by optical transmission/reflection measurements. The SnS/Zn(O,S) heterojunctions with S/Zn ratios of 0.37 and 0.50 have desirable small positive CBOs, while a ratio of 0.64 produces an undesirable large positive CBO. The results are consistent with the device performance of SnS/Zn(O,S) solar cells. © 2013 AIP Publishing LLC.
Richard Haight, Joel A. Silberman
IEEE JQE
Richard Haight, Wilfried Haensch, et al.
Science
Helen Hejin Park, Ashwin Jayaraman, et al.
Applied Physics Letters
Daeyoung Lim, Richard Haight
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films