Band alignment of SnS/Zn(O,S) heterojunctions in SnS thin film solar cells

Autor:	Richard Haight, Roy G. Gordon, Sang Bok Kim, Prasert Sinsermsuksakul, Leizhi Sun, Helen Hejin Park
Rok vydání:	2013
Předmět:	Materials science Physics and Astronomy (miscellaneous) business.industry Band gap Analytical chemistry Wide-bandgap semiconductor Infrared spectroscopy Heterojunction Laser pumping Optical pumping Femtosecond Optoelectronics business Ultraviolet photoelectron spectroscopy
Zdroj:	Applied Physics Letters. 103:181904
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.4821433
Popis:	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.
Databáze:	OpenAIRE
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