Presentation Title

Singlet Fission in Hybrid Thin Films for Photovoltaics with Bidentate Diphenylhexatriene Derivatives and Quantum Dots

Faculty Mentor

Ming Lee Tang

Start Date

18-11-2017 12:30 PM

End Date

18-11-2017 1:30 PM

Location

BSC-Ursa Minor 134

Session

Poster 2

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

Singlet fission is a process in molecules where multiple excitons are generated per photon absorbed. In certain molecules like diphenylhexatriene, a photon creates an excited state, which can then undergo singlet fission to create more than one electron-hole pair. Bidentate diphenylhexatriene ligands can bind to two inorganic semiconductor nanocrystals or quantum dots at each end of the ligand. This provides a percolating pathway for electrons, holes and excitons, and potentially creates the right morphology for singlet fission. Here, we synthesized DPH with the carboxylic acid, amino, pyridine and imidazole functional groups attached in a bidentate geometry to bind to the PbS nanocrystals. This work will examine the thin film morphology required for efficient singlet fission, charge and triplet exciton transport for inexpensive, solution processed, next-generation solar cells.

Summary of research results to be presented

Absorbance, fluorescence, phosphorescence quantum yields, and lifetime measurements are being performed on the bidentate diphenylhexatriene ligands. Their optical properties will be compared to the parent DPH molecule. In addition, these ligands are used as the active layer in photovoltaic thin films. Several instruments are used to construct and analyze the semiconductor. In terms of synthesis, two ylides are compared to examine whether the Wittig or Horner-Emmons-Wadsworth reaction gives a better yield.

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Nov 18th, 12:30 PM Nov 18th, 1:30 PM

Singlet Fission in Hybrid Thin Films for Photovoltaics with Bidentate Diphenylhexatriene Derivatives and Quantum Dots

BSC-Ursa Minor 134

Singlet fission is a process in molecules where multiple excitons are generated per photon absorbed. In certain molecules like diphenylhexatriene, a photon creates an excited state, which can then undergo singlet fission to create more than one electron-hole pair. Bidentate diphenylhexatriene ligands can bind to two inorganic semiconductor nanocrystals or quantum dots at each end of the ligand. This provides a percolating pathway for electrons, holes and excitons, and potentially creates the right morphology for singlet fission. Here, we synthesized DPH with the carboxylic acid, amino, pyridine and imidazole functional groups attached in a bidentate geometry to bind to the PbS nanocrystals. This work will examine the thin film morphology required for efficient singlet fission, charge and triplet exciton transport for inexpensive, solution processed, next-generation solar cells.