As the development of solar cells based on material alternatives to silicon continues to gather pace, the emerging technology of quantum dots (QD) is attracting growing interest. The latest research in this field, conducted by scientists at Russia’s National Research Nuclear University Moscow Engineering Physics Institute (MEPhI), looks into the charge and energy transfer in condensates of quantum dots.
Discussing the structure of semiconductor QD solids, optical and spectral properties, charge carrier transport, and photovoltaic applications, the research, titled Optoelectronic Properties of Semiconductor Quantum Dot Solids for Photovoltaic Applications and published in the Journal of Physical Chemistry Letters points out that the correct selection of a layer sequence involving QDs with different size, composition, and ligands can be used to absorb sunlight over a broad spectral range, leading to inexpensive and efficient photovoltaic devices.
Given that quantum dots consist of dozens of atoms, which are characterized by modification of their properties such as optical and electronic, and the number of which depends on the difference of energy levels of electrons and holes, consequently affecting the range of absorbed light, the scientists have shown that the distance between adjacent nanoparticles and surface ligands influences greatly electrostatic interactions between QDs and, hence, charge and energy transfer.
“The published work shows that the charge and energy transfer in condensates of quantum dots can be described in a relatively simple way. This considerably simplifies the task of theoretical modeling of charge carrier transport needed to optimize characteristics of optoelectronic devices based on quantum dots,” says one of the authors, Professor in MEPhI’s Department of Condensed Matter Physics, Vladimir Nikitenko.
Another breakthrough for this type of technology happened late last year, when scientists at the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) developed a solar cell using colloidal quantum dots, which achieved 13.4% conversion efficiency, setting a new world record.
This content is protected by copyright and may not be reused. If you want to cooperate with us and would like to reuse some of our content, please contact: firstname.lastname@example.org.
By submitting this form you agree to pv magazine using your data for the purposes of publishing your comment.
Your personal data will only be disclosed or otherwise transmitted to third parties for the purposes of spam filtering or if this is necessary for technical maintenance of the website. Any other transfer to third parties will not take place unless this is justified on the basis of applicable data protection regulations or if pv magazine is legally obliged to do so.
You may revoke this consent at any time with effect for the future, in which case your personal data will be deleted immediately. Otherwise, your data will be deleted if pv magazine has processed your request or the purpose of data storage is fulfilled.
Further information on data privacy can be found in our Data Protection Policy.