Abstract
Semiconductor quantum dots (QDs) are the subject of intensive research worldwide due to a number of novel properties, which make them of interest for both fundamental science and technological applications. QDs are of particular interest for solar cell applications due to their ability to increase efficiency via the generation of multiexcitons from a single photon. The efficiency of multiexciton generation (MEG) in colloidal QDs is determined by the competition between MEG and other hot electron-cooling processes. Core/shell QDs with type-II band alignment offers extra degrees of freedom in mediating both the optical dipoles and the Coulomb interaction between charges in such structures for the benefit of elevated MEG efficiency.
Highlights
N ANOMATERIALS have recently emerged as possible building blocks for solar energy conversion devices [1], [2]
quantum dots (QDs) have broad absorption profiles and possess large extinction coefficients and intrinsic dipole moments compared with conventional dyes [4], [5]
QDs raise the possibility of utilizing hot electrons [8] or multiexciton generation (MEG) [9], [10] to maximize the efficiency of solar cells
Summary
N ANOMATERIALS have recently emerged as possible building blocks for solar energy conversion devices [1], [2]. One of the most promising types is the semiconductor quantum dot (QD)-based solar cell. QDs possess several advantages for use as light harvesters in solar cells. Colloidal QDs can be used in low-cost solution processing for incorporation in thin-film photovoltaics [3]. QDs have broad absorption profiles and possess large extinction coefficients and intrinsic dipole moments compared with conventional dyes [4], [5]. Colloidal QD-based cells are compatible with other techniques beneficial to photovoltaic efficiency, such as light trapping by plasmonic nanocolloids [6]. QDs raise the possibility of utilizing hot electrons [8] or multiexciton generation (MEG) [9], [10] (the generation of two or more excitons from a single photon) to maximize the efficiency of solar cells
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