Abstract
Structural and optoelectronic properties of the pure l-alanine (CH3CHNH2COOH) and substituted with Li in two different sites CH3CHNHLiCOOH (basic) and CH3CHNH2COOLi (acidic) are systematically investigated by the density functional theory (DFT). We have used WIEN2k and Gaussian 09W codes for structural optimization. The optimized lattice constants are found to be consistent with the experimental results. l-Alanine is a wide indirect band gap compound and hence is an attractive material for optoelectronic applications. The calculated fundamental band gaps for CH3CHNH2COOH, CH3CHNHLiCOOH and CH3CHNH2COOLi are found to be 4.85, 3.50 and 2.40 eV, respectively. Obtained band gap value of 4.85 eV for l-alanine is in coincidence with the experimental (4.67 eV) and theoretical results (4.54 and 5.07 eV). Substitution of Li with H element in COOH chain, the transition from an indirect to direct band gap has been observed in sample. Optical properties such as dielectric functions and energy loss functions are also evaluated and discussed in detail.
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Acknowledgments
The authors are grateful to Professor P. Blaha (at Vienna University of Technology, Austria) for his technical assistance in the use of WIEN2K code also all members of Gaussian 09W code.
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Rahnamaye Aliabad, H.A., Mojarradi, Z. & Yalcin, B.G. DFT studies for optoelectronic properties of pure l-alanine and doped with Li. J Mater Sci: Mater Electron 27, 4887–4897 (2016). https://doi.org/10.1007/s10854-016-4372-1
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DOI: https://doi.org/10.1007/s10854-016-4372-1