Transport and Charging in Single Semiconductor Nanocrystals Studied by Conductance Atomic Force Microscopy

Nahum, E.; Ebenstein, Yuval; Aharoni, Assaf; Mokari, Taleb; Banin, Uri; Shimoni, N.; Millo, Oded

doi:10.1021/nl034928b

Cited by 23 publications

(16 citation statements)

References 30 publications

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“…In the case of InAs, reports have included the synthesis of core±shell type I heterostructure dots with an InAs core, shape control over rods and tetrapods in InAs, detailed probing of intersubband transitions in InAs, [12,13] and evidence of long-sustained charging in InAs nanocrystals. [14] Extensive time-resolved spectroscopy of visible and infrared nanocrystals has revealed some common trends, but also some quantitative variability. In the visible spectrum, holes are observed to relax more rapidly within the bands.…”

Section: Colloidal Quantum Dots: Synthesis and Propertiesmentioning

confidence: 99%

Infrared Quantum Dots

2005

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Colloidal nanocrystals are quantum‐size‐effect tunable; offer an abundance of available surface area for electronic and chemical interactions; and are processible from organic or aqueous solution onto substrates rigid or flexible, smooth or rough, flat or curved, inorganic or organic (including biological), crystalline or amorphous, conducting, semiconducting, or insulating. With the benefit of over a decade's progress in visible‐light‐emitting colloidal‐quantum‐dot synthesis, physical chemistry, and devices, significant progress has recently been made in infrared‐active colloidal quantum dots and devices. This progress report summarizes the state‐of‐the‐art in infrared colloidal quantum dots, with an emphasis on applications and devices. The applications of interest surveyed include monolithic integration of fiber‐optic and free‐space‐communications photonic components with electronic substrates such as silicon and glass; in‐vivo biological tagging in infrared spectral bands in which living tissue is optically penetrable to a depth of 5–10 cm; solar and thermal photovoltaics for energy conversion; and infrared sensing and imaging based on non‐visible, including thermal, signatures. The synthesis and properties of quantum dots are first reviewed: photoluminescence quantum efficiencies greater than 50 % are achievable in solution, and stable luminescent dots are available in organic and aqueous solvents. Electroluminescent devices based on solution processing have been reported with external quantum efficiencies approaching 1 %. Photoconductive devices have been realized with 3 % internal quantum efficiencies, and a photovoltaic effect was recently observed. Electro‐optic modulation achieved by either field‐ or charge‐induced modification of the rate of optical absorption has been demonstrated based both on interband and intersubband (intraband) transitions. Optical gain from these processible materials with a threshold of 1 mJ cm–2 and an optical net modal gain coefficient of 260 ± 20 cm–1 have been reported.

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Section: Colloidal Quantum Dots: Synthesis and Propertiesmentioning

confidence: 99%

Infrared Quantum Dots

2005

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“…Spectroscopic monitoring of the growth of semiconductor nanocrystals provides a useful method for exploring the process of particle growth in solution [6,7]. Provided that there is a concrete relationship between the optical spectrum and the particle size, initial conditions during nucleation and growth can be inferred [8][9][10]. In the case of CdSe, several groups have carried out extensive analyses of the position of the first excited state (1S e À1S 3/2h ) as a function of the mean crystallite size, determined by electron microscopy [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…In the case of CdSe, several groups have carried out extensive analyses of the position of the first excited state (1S e À1S 3/2h ) as a function of the mean crystallite size, determined by electron microscopy [10][11][12][13]. The data by Banin and co-workers show an r À1 dependence of the exciton energy on particle radius [9,13,14], and this provided the first extensive correlation between size and optical band edge.…”

Section: Introductionmentioning

confidence: 99%

Study on growth kinetics of CdSe nanocrystals in oleic acid/dodecylamine

Pan

Gao

et al. 2006

Journal of Crystal Growth

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“…Apart from photoexcitation, excess charge (both positive and negative) can be imparted to the semiconductor nanoparticles as a result of electrochemical reaction during their reaction with the free radicals produced by radiolytic [166] or chemical [207] methods [302,345,346]. The accumulation of excess charge on the surface of the semiconductor nanoparticles greatly affects not only their spectral optical characteristics but also the dynamics of radiative relaxation of the photogenerated charges.…”

Section: The Burstein-moss Effectmentioning

confidence: 99%

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

et al. 2005

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The appearance of quantum size effects in ultradisperse semiconductors, their quantitative analysis, and their effect on the absorption of light and on the photophysical (vibrational relaxation of photogenerated "hot" charge carriers, band-band and "defect" luminescence) and certain primary photochemical processes (the accumulation of excess negative charge by the semiconductor nanoparticles, interphase electron transfer, etc.) are discussed.

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Transport and Charging in Single Semiconductor Nanocrystals Studied by Conductance Atomic Force Microscopy

Cited by 23 publications

References 30 publications

Infrared Quantum Dots

Infrared Quantum Dots

Study on growth kinetics of CdSe nanocrystals in oleic acid/dodecylamine

Quantum Size Effects in the Photonics of Semiconductor Nanoparticles

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