Effects of impurity band in heavily doped ZnO:HCl

Colibaba, G.V.; Avdonin, A.; Shtepliuk, Ivan; Caraman, Mihail; Domagała, J. Z.; Inculet, I.I.

doi:10.1016/j.physb.2018.10.031

Cited by 8 publications

(1 citation statement)

References 36 publications

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“…If the defects and impurities energy states are placed energetically far from the CB, and the VB, a metallic band made of impurity states can arise inside the bandgap . It has been suggested that carriers in the impurity band should have similar spectral features as the free carriers in the VB and CB. − If carriers inside the impurity band are considered analogous to free carriers, a simple mechanism can be devised to justify the measured negative component: when carriers in the impurity band are excited into localized states, the free carrier density decreases and, therefore, also does the free carrier absorption. This model could also explain literature data showing a decrease in the width of the acceptor band (V Cu ) in CuI with increasing heat-treatment temperatures .…”

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confidence: 99%

Carrier Dynamics in Solution-Processed CuI as a P-Type Semiconductor: The Origin of Negative Photoconductivity

Bericat-Vadell

Zou

Corvoysier

et al. 2023

J. Phys. Chem. Lett.

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There is an urgent need for efficient solutionprocessable p-type semiconductors. Copper(I) iodide (CuI) has attracted attention as a potential candidate due to its good electrical properties and ease of preparation. However, its carrier dynamics still need to be better understood. Carrier dynamics after bandgap excitation yielded a convoluted signal of free carriers (positive signal) and a negative feature, which was also present when the material was excited with sub-bandgap excitation energies. This previously unseen feature was found to be dependent on measurement temperature and attributed to negative photoconductivity. The unexpected signal relates to the formation of polarons or strongly bound excitons. The possibility of coupling CuI to plasmonic sensitizers is also tested, yielding positive results. The outcomes mentioned above could have profound implications regarding the applicability of CuI in photocatalytic and photovoltaic systems and could also open a whole new range of possible applications.

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confidence: 99%