Biexciton and trion energy transfer from CdSe/CdS giant nanocrystals to Si substrates

Guo, Tianle; Sampat, Siddharth; Rupich, Sara M.; Hollingsworth, Jennifer A.; Buck, Matthew; Htoon, Han; Chabal, Yves J.; Gartstein, Yuri N.; Malko, Anton V.

doi:10.1039/C7NR06272A

Title: Biexciton and trion energy transfer from CdSe/CdS giant nanocrystals to Si substrates

Journal Article · Wed Nov 29 00:00:00 EST 2017 · Nanoscale

DOI:https://doi.org/10.1039/C7NR06272A· OSTI ID:1570617

Guo, Tianle ^[1]; Sampat, Siddharth ^[1]; Rupich, Sara M. ^[1];

^[2]; Buck, Matthew ^[2];

^[2];

^[1]; Gartstein, Yuri N. ^[1];

^[1]

The Univ. of Texas at Dallas, Richardson, TX (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Observation of energy transfer (ET) from multiexcitonic (MX) complexes in nanocrystal quantum dots (NQDs) has been severely restricted due to efficient nonradiative Auger recombination leading to very low MX emission quantum yields. Here we employed “giant” CdSe/CdS NQDs with suppressed Auger recombination to study ET of biexcitons (BX) and charged excitons (trions) into Si substrate. Photoluminescence (PL) measurements of (sub)monolayers of gNQDs controllably assembled on various interacting surfaces and augmented by single gNQD's imaging reveal appearance of BX spectral signatures and progressive acceleration of PL lifetimes of all excitonic species on Si substrates. From statistical analysis of a large number of PL lifetime traces, representative exciton, trion and BX ET efficiencies are measured as ~75%, 55% and 45% respectively. Detailed analysis of the MX's radiative rates demonstrate the crucial role of the radiative (waveguide) ET in maintaining high overall transfer efficiency despite the prevalent Auger recombination. Furthermore, our observations point towards practical utilization of MX-bearing nanocrystals in future optoelectronics architectures.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1570617

Report Number(s):: LA-UR-18-28800; NANOHL

Journal Information:: Nanoscale, Vol. 9, Issue 48; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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