In that case, the difference or the total widths and shapes of the valence and conduction bands formed by the interaction of the HOMO and LUMO levels of the π-conjugated chains, respectively, determine the hole and electron mobilalities or the band gap of the material. It turns out that, at low temperature, the charge transport in a number of organic crystals and highly organized thin films can be described in a band-like regime similar to that in inorganic semiconductors. The higher the HOMO (LUMO) bandwidth, the higher the expected hole (electron) mobility. Similarly, LOMO level can be compared to the conduction band, a term used to explain a vacant or partially occupied set of many closely spaced electronic levels in which the electrons are free to move. The term HOMO stands for highest occupied molecular orbital while the term LUMO stands for lowest unoccupied molecular orbital. The terms HOMO and LUMO are under the subtopic molecular orbital theory in general chemistry. HOMO level is analogous to the term valence band, associated with inorganic semiconductors, and used to imply a lower set of energy levels, completely filled with electrons. The key difference between Homo and Lumo is that the HOMO donates electrons whereas the LUMO receives electrons. This splitting is due to the interaction of adjacent chains along given directions yields the transfer integral to be used for the description of hole (electron) transport in these directions. The bonding states are the highest occupied molecular orbital (HOMO π−orbitals) and anti-bonding states are the lowest unoccupied molecular orbital (LUMO π*−orbitals). In this class of materials, the molecular orbitals split into bonding and anti-bonding states. Generally at the beginning of the 21st century, new electronics revolution that has become possible due to the development and understanding of a new class of materials, commonly known as Organic Semiconductors. next you will have a short abbreviation was prepared about HOMO-LOMO (bonds and gaps) and the reference were cited. Herein find beside the following text four attached papers give you more details about HOMO-LOMO gap identification and how to calculate it optically.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |