الفهرس 
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Abstract
This dissertation begins with a general introduction of solar energy. The state-of-the-art
development of various solar cell technologies is reviewed. Critical factors limiting the solar cell
device performance are highlighted and strategies for further device improvement are
demonstrated by giving recent examples from literature. In this work, we develop solutionprocessed
photovoltaic devices using lead sulphide quantum dots and high surface area porous
titanium dioxide electrodes. Both the materials and device structures are investigated and
optimized systematically in respect of QD synthesis, post-synthetic modification and device
fabrication, leading to an improvement of quantum dot based solar cells power conversion
efficiency (PCE.