The physical process of singlet exciton fission permits conversion of one singlet exciton (S1) into two low energy triplet excitons (T1). This happens when two neighboring molecules form a triplet intermediate state that is of singlet character, which then breaks down at ultrafast time scales into two triplet states via S1 + S0 → T1 + T1.
The potential to have multiple charge carriers per absorbed photon in singlet fission (SF) active organic materials has attracted much attention for the enhancement of the overall efficiency of photon to electron conversion. The Organic photovoltaic research group at QUT is devising new strategies for efficient dissociation of triplet excitons into free charges.
In this project we will develop multilayer organic solar cell devices that will have more than one acceptor. Our focus will be on triplet acceptors in photovoltaic cascades and their role in ionizing triplet excitons in pentacene, rubrene and tetracene.
You will work on mechanisms that are aimed at enhancing the overall efficiency of energy conversion in organic photovoltaics.
We expect the outcomes of this project to include:
- working mechanism of organic solar cells
- energy and charge transfer in organic semiconductor heterojunctions
- fabrication and characterisation of thin film organic solar cells.
Contact the supervisor for more information.