Hybrid polymer-CdS solar cell active layers formed by in situ growth of CdS nanoparticles

TitleHybrid polymer-CdS solar cell active layers formed by in situ growth of CdS nanoparticles
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2011
AuthorsMasala, S., Del Gobbo S., Borriello C., Bizzarro V., La Ferrara V., Re Marilena, Pesce Emanuela, Minarini Carla, De Crescenzi M., and Di Luccio Tiziana
JournalJournal of Nanoparticle Research
KeywordsActive Layer, Annealing temperatures, article, Cadmium, Cadmium compounds, Cadmium sulfide, CdS, CdS nanoparticles, Electrical equipment, Energy conversion, External quantum efficiency, Focused ion beam technique, In-situ growth, In-situ thermal decomposition, Low temperatures, Morphological features, Nanocomposites, nanoparticle, Nanoparticles, Optical properties, P3HT, Photocurrent response, Photoluminescence, Photoluminescence spectroscopy, Photovoltaic response, poly(3 hexylthiophene), Poly-3-hexylthiophene, polymer, Polymer Solar Cells, Polymer-based solar cells, Polymeric matrices, Precursor decomposition, priority journal, Pyrolysis, quantum yield, Room temperature, Semiconductor growth, Semiconductor nanoparticles, solar cell, Solar cell performance, Spectral region, synthesis, Temperature measurement, Thiolates, thiophene derivative, Ultraviolet spectroscopy, unclassified drug, UV-vis absorptions, Weight ratios

The integration of semiconductor nanoparticles (NPs) into a polymeric matrix has the potential to enhance the performance of polymer-based solar cells taking advantage of the physical properties of NPs and polymers. We synthesize a new class of CdS-NPsbased active layer employing a low-cost and low temperature route compatible with large-scale device manufacturing. Our approach is based on the controlled in situ thermal decomposition of a cadmium thiolate precursor in poly(3-hexylthiophene) (P3HT). The casted P3HT:precursor solid foils were heated up from 200 to 300 °C to allowthe precursor decomposition and the CdS-NP formation within the polymer matrix. The CdS-NP growth was controlled by varying the annealing temperature. The polymer:precursor weight ratio was also varied to investigate the effects of increasing the NP volume fraction on the solar cell performances. The optical properties were studied by using UV-Vis absorption and photoluminescence (PL) spectroscopy at room temperature. To investigate the photocurrent response of P3HT:CdS nanocomposites, ITO/P3HT: CdS/Al solar cell devices were realized. We measured the external quantum efficiency (EQE) as a function of the wavelength. The photovoltaic response of the devices containing CdS-NPs showed a variation compared with the devices with P3HT only. By changing the annealing temperature the EQE is enhanced in the 400-600 nm spectral region. By increasing the NPs volume fraction remarkable changes in the EQE spectra were observed. The data are discussed also in relation to morphological features of the interfaces studied by Focused Ion Beam technique. © 2011 Springer Science+Business Media B.V.


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