Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.086
Publication date: 6th July 2018
Colloidal semiconductor nanocrystals, specifically quantum dots (QDs), are of interest to numerous scientific disciplines due to their highly tunable optical and electronic properties. For many years, various chemical treatments have been developed to fabricate conductive QD arrays for use in solar cells. While such investigations have lead to increased solar cell performance there is much about how the chemical treatments modify the optical and electrical properties that are not well understood. We have developed a simple, robust, and scalable solution-phase X-type ligand exchange method for PbS QDs that replaces native surface ligands with functionalized cinnamate ligands, yielding highly tunable, well-defined organic/inorganic hybrid chemical systems. We explore a library of functionalized cinnamic acid molecules to systematically tune PbS QD surface chemistry, and find that thin films of fully ligand exchanged QDs exhibit remarkable band edge shifts: the band edge position of QDs can be tuned over 2.0 eV. We have also developed simple methods to impurity dope PbS and PbSe QDs with both n and p-type dopants. We show how the dopants are incorporated and result in doped QDs with well behaved properties.
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