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Coulter, Jennifer B. & Birnie, Dunbar P. (2018). Assessing Tauc plot slope quantification: ZnO thin films as a model system. Physica Status Solidi B, 255, 1700393. Retrieved from https://doi.org/doi:10.7282/T3445QC7

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Assessing Tauc plot slope quantification: ZnO thin films as a model system (2018)
Jennifer B. Coulter, Dunbar P. Birnie
Physica Status Solidi B 255: 1700393.
Link to published version
VersionAccepted Manuscript (AM)
AbstractOne of the most frequently used methods for characterizing thin films is UV-Vis absorption. The near-edge region can be fitted to a simple expression where the intercept gives the band-gap and the fitting exponent identifies the electronic transition as direct or indirect. (See Tauc et al., Physica Status Solidi, 15, 627 (1966); naturally, these are usually called “Tauc” plots.) In earlier work, we found that direct band-gaps fitted using Tauc’s method can be quite accurate, to ~1%. (See Viezbicke et al., Physica Status Solidi, B252, 1700 (2015).) Still, slopes of these Tauc plots are less frequently quantified, even though the slopes are directly rooted in key band-structure parameters. In this study, we examine the reproducibility of Tauc plot slopes for ZnO as a model direct-gap material and compare these experimental values with the theoretically derived slope. In contrast to the band-gap accuracy, the experimental slope values varied by several orders of magnitude. The histogram of slope values was significantly more compact for Tauc plots exhibiting less Urbach tail contribution. In these cases, the Tauc slopes can provide an order-of-magnitude quantification of other key band characteristics such as carrier effective mass.
Persistent URLhttps://doi.org/doi:10.7282/T3445QC7
SubjectsBand gaps, Near-edge absorptivity ratio, Optical absorption, Tauc plots, Thin films, ZnO
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