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Title: Charge-pair generation and separation in solution-processable solar cells
Author: Campbell, A. R.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2010
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This thesis investigates the performance of solution-processable solar cells made from blends of two conjugated polymers or a polymer and a semiconductor nanocrystal. Device characterisation, steady-state spectroscopy and ultrafast spectroscopy are used to illuminate the factors affecting charge-pair generation and separation and their impact upon device performance. An improved processing technique based on spin-coating polymer blends from a controlled solvent mixture is described. The resulting optimisation of device performance is shown to be the result of a change in the drying time of the film during spin coating. This affects the morphology of the films, changing both the geometry of the phase-separated domains and, where semicrystalline polymers are used, the ordering of the polymers within those domains. Parameterisation of the IV curves of solar cells processed in this way shows that the enhancement in performance is the result of an increase in charge-pair separation efficiency and occurs despite a decrease in charge-pair generation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available