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Solution processed quantum dot photodetectors
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Resumo(s)
To find sustainable solutions for the production of energy, it is necessary to create
photovoltaic technologies that make every photon count. To pursue this necessity, in
the present work photodetectors of zinc oxide embedded with nano-structured materials,
that significantly raise the conversion of solar energy to electric energy, were developed.
The novelty of this work is on the development of processing methodologies in which
all steps are in solution: quantum dots synthesis, passivation of their surface and sol-gel
deposition.
The quantum dot solutions with different capping agents were characterized by UVvisible
absorption spectroscopy, spectrofluorimetry, dynamic light scattering and transmission
electron microscopy. The obtained quantum dots have dimensions between 2
and 3nm. These particles were suspended in zinc acetate solutions and used to produce
doped zinc oxide films with embedded quantum dots, whose electric response was tested.
The produced nano-structured zinc oxide materials have a superior performance than
the bulk, in terms of the produced photo-current. This indicates that an intermediate
band material should have been produced that acts as a photovoltaic medium for solar
cells. The results are currently being compiled in a scientific article, that is being
prepared for possible submission to Energy and Environmental Science or Nanoscale
journals.