Recent results from four research groups of LNBE presented at SPIE Photonics West 2014

Researchers of the Nanochemistry, Nano-Heterostructures, Nanomedicine, and Biophysics groups presented oral statements on the results of their resent studies at the SPIE Photonics West 2014 international forum held in San Francisco, CA, United States, on February 1–6 this year.

Dr. Samokhvalov, the leader of the Nanochemistry Group, reported on recent advances in the synthesis of highly luminescent quantum dots (Enhancement of charge carrier confinement for high photoluminescence efficiency in CdSe/ZnS/CdS/ZnS quantum dots). The research team has developed a method based on sequentially layering three shells to obtain alternation of materials with different band gaps. This approach enhances charge localization in the nanocrystal core (this applies to both electrons and holes), allowing quantum dots with an almost 100% quantum yield to be obtained.

The presentation on Hybrid bulk heterojunction solar cells based on low band gap polymers and CdSe nanocrystals by Dr. Dayneko (Nano-Heterostructures Group) dealt with the use of hybrid materials based on low band gap organic semiconductors and quantum dots as the main components of solar cells. It was demonstrated that the nanoparticle size substantially affects the efficiency of the solar cells based these materials. Indeed, by varying the quantum dot size and optimizing the positions of energy levels, the researchers managed to increase the solar cell efficiency by a factor of four compared to the initial design. The results will be useful for the development of advanced solar cells based on organic semiconductors and luminescent nanocrystals.

The Nanomedicine and Biophysics groups in collaboration with foreign colleagues presented a study on Large nonlinear and linear optical responses in a hybrid nano-biomaterial engineered from bacteriorhodopsin and semiconductor quantum dots. Data on the resonance effect resulting from the interaction between photosensitive proteins and quantum dots were reported. The nonlinear reflection coefficient of this hybrid structure is more than 4000% higher than that of each individual component.

In addition, Dr. Samokhvalov chaired the session Biomedical Applications III of the SPIE Photonics West 2014 conference Colloidal Nanoparticles for Biomedical Applications IX. This session dealt with problems entailed in quantum dot introduction into living cells and the use of quantum dots for diagnosis of cancer and infectious diseases and for studying and modifying signal transmission within and between living cells, including tumor ones.

The results presented at SPIE Photonics West 2014 will be published in the Proceedings of SPIE.

Contacts:

Pavel S. Samokhvalov, PhD, senior researcher (p.samokhvalov@gmail.com)

Sergey V. Dayneko, PhD, researcher (s.daineko@gmail.com)

Prof. Igor R. Nabiev, PhD, DSc, leading scientist (igor.nabiev@gmail.com)

Laboratory of Nano-Bioengineering, Moscow Engineering Physics Institute,
31 Kashirskoe shosse, 115409 Moscow, Russian Federation

http://www.lnbe.mephi.ru/en

 
 
 
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