Scholes Gregory D
Department of Chemistry, 80 St. George Street, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
ACS Nano. 2008 Mar;2(3):523-37. doi: 10.1021/nn700179k.
The characteristics of nanoscale excitons--the primary excited states of nanoscale systems like conjugated polymers, molecular aggregates, carbon nanotubes, and nanocrystalline quantum dots--are examined through exploration of model systems. On the basis of a valence bond-type model, an intuition is developed for understanding and comparing nanoscale systems. In particular, electron-hole interactions are examined in detail, showing how and why they affect spectroscopy and properties such as binding energy. The relationship between the bound exciton states and the nanoscale analogue of free carriers (charge-transfer exciton states) is developed. It is shown why the electron and hole act as independent particles in this manifold of states. The outlook for the field is discussed on the basis of the picture developed in the paper, with an emphasis on exciton binding and photodissociation.
通过对模型系统的探索，研究了纳米级激子（如共轭聚合物、分子聚集体、碳纳米管和纳米晶量子点等纳米级系统的主要激发态）的特性。基于价键型模型，形成了一种理解和比较纳米级系统的直觉。特别详细研究了电子 - 空穴相互作用，展示了它们如何以及为何影响光谱学和诸如结合能等性质。建立了束缚激子态与自由载流子的纳米级类似物（电荷转移激子态）之间的关系。说明了在这种态的多重性中电子和空穴为何表现为独立粒子。基于本文所阐述的情况讨论了该领域的前景，重点是激子束缚和光解离。
