期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 27, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202202121
关键词
amino acid doped Cu; O-2; bandgap distribution; disorder; optical properties; quantum confinement
类别
资金
- German-Israeli Foundation for Scientific Research and Development (GIF) [I-1512-401.10/2019]
- Bavarian State Ministry of Science, and Arts
- LMU Munich through the grant Solar Technologies go Hybrid (SolTech)
- Alexander von Humboldt Foundation
- Projekt DEAL
This study investigates the optical properties of a bioinspired system, Cu2O-AAs, using optical spectroscopy and theoretical modeling. The presence of amino acids strongly influences the absorption and photoluminescence excitation spectra of Cu2O-AAs, resulting in a blue-shift and wider band gap due to quantum confinement effects. Surprisingly, no such shift is observed in the emission spectra, which can be explained by the inhomogeneous distribution of amino acids within Cu2O-AAs predicted by the theoretical model.
Biominerals are organic-inorganic nanocomposites exhibiting remarkable properties due to their unique configuration. Using optical spectroscopy and theoretical modeling, it is shown that the optical properties of a model bioinspired system, an inorganic semiconductor host (Cu2O) grown in the presence of amino acids (AAs), are strongly influenced by the latter. The absorption and photoluminescence excitation spectra of Cu2O-AAs blue-shift with growing AA content, indicating band gap widening. This is attributed to the void-induced quantum confinement effects. Surprisingly, no such shift occurs in the emission spectra. The theoretical model, assuming an inhomogeneous AA distribution within Cu2O-AAs due to compositional disorder, explains the deviating behavior of the photoluminescence. The model predicts that the potential causing the confinement effects becomes a function of the local AA density. It results in a Gaussian band gap distribution that shapes the optical properties of Cu2O-AAs. Imitating and harnessing the process of biomineralization can pave the way toward new functional materials.
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