Abstract
Colloidal quantum dots (QDs) exhibit size-/shape-/composition-dependent optoelectronic properties due to quantum confinement and considered as building blocks for several optoelectronic devices. However, QDs possess a high density of surface trap states, which act as non-radiative carrier recombination centers, thereby reducing the overall performance of the optoelectronic device. Surface passivation of QDs by the epitaxial growth of an outer shell of different materials or composition, so-called core/shell QDs, has proven to be an effective approach to reduce the surface trap states as well as to tune their optoelectronic properties. Resulting core/shell QDs offer broader absorption spectrum, improved quantum yield (QY), and prolonged photoluminescence (PL) lifetime with better thermal, chemical, and photophysical stability compared to core QDs. In addition, these optoelectronic properties can be controlled by tuning the size and shape of core QDs, thickness and compositions of the shell layer, and electronic band edge alignment between core and shell. This chapter provides a comprehensive overview of the recent development in QDs-sensitized solar cells (QDSCs) based on different types of colloidal core/shell QDs including type-I, type-II, and quasi-type-II core/shell QDs as light-harvesting materials.
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