PhD ceremony: M.M. Mandoc, 16.15 uur, Academiegebouw, Broerstraat 5, Groningen
Thesis: Device physics of all-polymer solar cells
Promotor(s): prof. P.W.M. Blom
Faculty: Mathematics and Natural Sciences
Organic solar cells show much lower efficiency as compared to their inorganic counterparts. Improving their efficiency will open a wide range of applications complementary to, or even competing with the use of inorganic cells. Presently, the most efficient polymeric solar cells are based on bulk-heterojunctions of a polymer as a donor and a fullerene as an acceptor. The light absorption in this type of cells occurs mainly in the polymeric phase of the blend. Replacing the fullerene by a conjugated polymer as acceptor, the so-called all-polymer solar cells have the potential of higher efficiencies due to light absorption in both components. Their performance so far has been lower as compared to polymer-fullerene cells. This thesis deals with the device physics of all-polymer solar cells and with the mechanisms that limit their performance.
Charge transport properties of all-polymer solar cells based on poly(p-phenylene vinylene) (PPV) derivatives and the photogeneration mechanism are investigated in this thesis. Electron transport in PPV derivatives is analyzed. The solar cells studied in this thesis suffer from the presence of electron traps. This contributes to additional recombination losses through trap-assisted recombination. The efficiency of all-polymer solar cells increases upon annealing. The cause of this increase is also investigated in this thesis.
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