Charge separation in type II tunneling structures of close-packed CdTe and CdSe nanocrystals

Nano Letters
Dieter GrossJochen Feldmann

Abstract

We report on charge separation between type II aligned CdTe and CdSe nanocrystals. Two types of electrostatically bound nanocrystal structures have been studied: first, clusters of nanocrystals hold together by Ca(II) ions in aqueous solution and, second, thin film structures of nanocrystals created with layer-by-layer deposition in combination with polyelectrolytes. In both types of structures, short interparticle distances of less than 1 nm have been achieved, whereby the isolating organic ligands on the nanocrystal surfaces and/or the polymer monolayers act as tunneling barriers between nanocrystals. We have observed an efficient quenching of photoluminescence and a reduced emission lifetime for CdTe nanocrystals in both types of type II heterostructures. This result is explained by a spatial charge separation of the photoexcited electron-hole pairs due to tunneling of charge carriers through the thin organic layer between CdTe and CdSe nanocrystals. Type II heterostructures demonstrated here may find future applications in photovoltaics.

References

Feb 26, 1996·Physical Review Letters·C R KaganM G Bawendi
Aug 2, 2001·Journal of the American Chemical Society·A A MamedovN A Kotov
Sep 18, 2003·Journal of the American Chemical Society·Sungjee KimMoungi Bawendi
Jan 6, 2004·Nature Biotechnology·Paul Alivisatos
Oct 22, 2005·Science·Ilan GurA Paul Alivisatos
Feb 16, 2006·Journal of the American Chemical Society·István RobelPrashant V Kamat
Jul 13, 2006·Nano Letters·Andreas BiebersdorfJochen Feldmann
Sep 28, 2006·Journal of the American Chemical Society·Jonathan E HalpertMoungi G Bawendi
Aug 21, 2007·Small·Sandeep KumarGregory D Scholes

❮ Previous
Next ❯

Citations

Apr 27, 2011·ACS Nano·Elise TalgornArjan J Houtepen
Dec 9, 2009·The Journal of Chemical Physics·Yurong YangJ X Cao
Dec 23, 2014·The Journal of Physical Chemistry. B·Douglas A HinesPrashant V Kamat
Feb 11, 2014·ACS Applied Materials & Interfaces·Douglas A Hines, Prashant V Kamat
Jul 17, 2009·Journal of the American Chemical Society·Blake Farrow, Prashant V Kamat
Sep 3, 2016·Chemical Reviews·Lihong JingMingyuan Gao
Sep 17, 2016·Journal of the American Chemical Society·Brittney M GraffDavid H Waldeck
Oct 25, 2016·Journal of Colloid and Interface Science·Hui FengQingyun Cai
Jun 24, 2015·Dalton Transactions : an International Journal of Inorganic Chemistry·Hongmei ChenXiaoxiang Xu
May 14, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Sachin RawalekarHirendra N Ghosh
Apr 14, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Yu WangAndrey L Rogach
Jul 28, 2009·Small·Yoshiyuki NonoguchiTsuyoshi Kawai
Jun 15, 2010·Physical Chemistry Chemical Physics : PCCP·Nikolai Gaponik, Andrey L Rogach
Jan 8, 2011·Nanotechnology·Chun Hsiung WangChia Chun Chen
Apr 2, 2010·ACS Applied Materials & Interfaces·Sean A McClureJillian M Buriak
Jan 13, 2009·The Journal of Physical Chemistry. a·Gilad GotesmanRon Naaman
Dec 24, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Chun-Lei WangYi-Ping Cui
Mar 30, 2011·Journal of the American Chemical Society·Arrigo CalzolariAlessandra Catellani

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.