On the Origin of Photoluminescence in Silicon Nanocrystals: Pressure-Dependent Structural and Optical Studies
Nano Letters2012Vol. 12(8), pp. 4200–4205
Citations Over TimeTop 10% of 2012 papers
Daniel C. Hannah, Jihua Yang, Paul Podsiadlo, Maria K. Y. Chan, Arnaud Demortière, David J. Gosztola, Vitali B. Prakapenka, George C. Schatz, Uwe Kortshagen, Richard D. Schaller
Abstract
A lack of consensus persists regarding the origin of photoluminescence in silicon nanocrystals. Here we report pressure-dependences of X-ray diffraction and photoluminescence from alkane-terminated colloidal particles. We determine the diamond-phase bulk modulus, observe multiple phase transitions, and importantly find a systematic photoluminescence red shift that matches the X(conduction)-to-Γ(valence) transition of bulk crystalline silicon. These results, reinforced by calculations, suggest that the efficient photoluminescence, frequently attributed to defects, arises instead from core-states that remain highly indirect despite quantum confinement.
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