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'''The Quantum Dot Heterojunction Junction Solar Cell'''
There are several different cell architectures that are currently being used in Colloidal Quantum Dot (QCD) solar cell research; they include quantum dot sensitized cells, Schottky Junction cells, and a variety of heterojunction based cell designs.  For this application, the solar cell will use a semiconductor-semiconductor heterojunction cellsas it's effective p-n junction. Titanium Dioxide is a metal oxide that is commonly used as a transparent film with n-type semiconductor properties due to oxygen vacancies in its lattice and the presence of negatively charged charge carriers. This film material is intentionally chosen with a high band gap (~3.5eV, semiconductor-conjugated polymer cellsdepending on nanoparticle size and preparation technique), and subsequently allows the Schottky Junction cellmajority of photons to pass through into the layer of colloidal CdSe nanocrystals. TiO<sub>2</sub> nanoparticles are available for purchase
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