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Carrier multiplication in germanium nanocrystals
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作者 Saba Saeed chris de weerd +4 位作者 Peter Stallinga Frank CM Spoor Arjan J Houtepen Laurens DA Siebbeles Tom Gregorkiewicz 《Light(Science & Applications)》 SCIE EI CAS CSCD 2015年第1期498-503,共6页
Carrier multiplication is demonstrated in a solid-state dispersion of germanium nanocrystals in a silicon–dioxide matrix.This is performed by comparing ultrafast photo-induced absorption transients at different pump ... Carrier multiplication is demonstrated in a solid-state dispersion of germanium nanocrystals in a silicon–dioxide matrix.This is performed by comparing ultrafast photo-induced absorption transients at different pump photon energies below and above the threshold energy for this process.The average germanium nanocrystal size is approximately 5–6 nm,as inferred from photoluminescence and Raman spectra.A carrier multiplication efficiency of approximately 190%is measured for photo-excitation at 2.8 times the optical bandgap of germanium nanocrystals,deduced from their photoluminescence spectra. 展开更多
关键词 carrier multiplication germanium nanocrystals transient absorption
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