Event Title

Synthesis of end group functionalized PMMA ligands for QD based LSCs

Research Mentor(s)

David Rider

Description

Luminescent solar concentrators (LSCs) enhance the efficiency of photovoltaic devices (PVs) through the absorption and redirection of light by nanocrystal quantum dots in a polymer matrix.  Through an exchange of native ligands for selected polymer ligands, nanocrystal quantum dots (QDs) are coated in poly(methyl methacrylate) (PMMA) ligands of known length. Reversible Addition-Fragmentation chain Transfer (RAFT) radical polymerization can be used to selectively generate polymers of preferred molecular weight. Current molecular weight targets are 2,000, 3,000, 5,000, 10,000 Da and the isolated polymer is determined by GPC. This research is aimed at producing a finely tuned polymer matrix for use in luminescent solar concentrators to control the dispersity and aggregation of nanocrystal quantum dots. Hydroxy-, amine-, imidazole-, dithiocarbomate-, or thiol- terminated PMMA have been explored for optimal ligand exchange to decrease aggregation while minimizing quantum yield loss. Currently thiol capping of the PMMA is the desired end group for ligand exchange. Formation of a thiolactam ring during the capping process has been observed and can possibly be avoided through addition of a spacer via diblock copolymerization.

Document Type

Event

Start Date

16-5-2018 12:00 AM

End Date

16-5-2018 12:00 AM

Department

Chemistry

Comments

Outstanding Poster Award Recipient

Rights

Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.

Language

English

Format

application/pdf

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May 16th, 12:00 AM May 16th, 12:00 AM

Synthesis of end group functionalized PMMA ligands for QD based LSCs

Luminescent solar concentrators (LSCs) enhance the efficiency of photovoltaic devices (PVs) through the absorption and redirection of light by nanocrystal quantum dots in a polymer matrix.  Through an exchange of native ligands for selected polymer ligands, nanocrystal quantum dots (QDs) are coated in poly(methyl methacrylate) (PMMA) ligands of known length. Reversible Addition-Fragmentation chain Transfer (RAFT) radical polymerization can be used to selectively generate polymers of preferred molecular weight. Current molecular weight targets are 2,000, 3,000, 5,000, 10,000 Da and the isolated polymer is determined by GPC. This research is aimed at producing a finely tuned polymer matrix for use in luminescent solar concentrators to control the dispersity and aggregation of nanocrystal quantum dots. Hydroxy-, amine-, imidazole-, dithiocarbomate-, or thiol- terminated PMMA have been explored for optimal ligand exchange to decrease aggregation while minimizing quantum yield loss. Currently thiol capping of the PMMA is the desired end group for ligand exchange. Formation of a thiolactam ring during the capping process has been observed and can possibly be avoided through addition of a spacer via diblock copolymerization.