Síntese e Caraterização Termo-óptica de Filmes Finos de Au/CdSe para Aplicação em Células Fotovoltaicas

Abstract

Materials on the nanometric scale have different physical/chemical properties than bulk materials, composed of the same elements. Knowledge of its properties makes it possible to improve techniques and applications in the area of nanotechnology. In this work, samples of thin films of CdSe quantum dots functionalized with MPA (3-mercaptopropionic acid) and Au nanoparticles in a PVA matrix (polyvinyl alcohol - [-CH2CHOH-]N) were synthesized by the drop casting method and its characterized thermo-optical properties. Thermo-optical properties were measured and analyzed using optical absorbance, photoluminescence and thermal lensing techniques. Structural analysis was performed based on TEM and EDS images. The growth of quantum dots and their deposition on film was confirmed by absorption and photoluminescence spectra. The addition of AuNPs to CdSe PQs broadens the absorbance spectrum to the entire visible region, reduces the PL intensity due to the occurrence of the energy transfer process from CdSe (donor) to AuNPs (acceptor), indicating the potential application of AuNPs/CdSe-PQs films in photovoltaic devices.