Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 18, Issue 14, Pages 9682-9686Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp00451b
Keywords
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Funding
- National Natural Science Foundation of China [A040204, 11304263, 11404275, 11274265, 11204260, 11204261]
- National Basic Research Program of China [2012CB921303, 2015CB921103]
- Scientific Research Found of HuNan Provincial Education department [14C1095]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT13093]
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In our present work, five previously proposed sp(3) carbon crystals were suggested as silicon allotropes and their stabilities, electronic and optical properties were investigated using the first-principles method. We find that these allotropes with direct or quasi-direct band gaps in a range of 1.2-1.6 eV are very suitable for applications in thin-film solar cells. They display strong adsorption coefficients in the visible range of sunlight in comparison with diamond silicon. These five silicon allotropes are confirmed to possess positive dynamical stability and remarkable themodynamical stability close to that of diamond silicon. In particular, the direct band gap M585-silicon possessing energy higher than diamond silicon only 25 meV per atom is expected to be experimentally produced for thin-film solar cells.
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