QDs in Solar Cells
Nanocomposite and polymer based solar cells require an interface between the matrix material (TiO2 or an organic polymer) and QDs in order to dissociate the photogenerated excitons. After dissociation, one carrier conducts through the matrix, while the other carrier conducts by hopping between the QDs. We are investigating whether the efficiency of exciton dissociation and electrical conduction can be enhanced with ordered networks of strongly coupled QDs. Techniques include absorption and photoluminescence spectroscopy and time-correlated single photon counting. This work is highly interdisciplinary: we are investigating methods to form these ordered networks of QD that range from co-sputtering of matrix and QD material to the synthesis of self-organizing biopolymers.