|Title||PbS nanocrystals in hybrid systems for solar cell applications|
|Publication Type||Articolo su Rivista peer-reviewed|
|Year of Publication||2015|
|Authors||Borriello, Carmela, Bruno A., Diana R., Di Luccio Tiziana, Morvillo P., Ricciardi Rosa, Villani Fulvia, and Minarini Carla|
|Journal||Physica Status Solidi (A) Applications and Materials Science|
|Keywords||Crystal structure, Cubic crystal structures, Environmental stability, Fluorescence measurements, Hybrid systems, Infrared devices, Inorganic compounds, Ligands, Nanocrystals, Near-infrared wavelength, Organic/inorganic composites, P3HT, PbS nanocrystal, Polymer blends, Polymers, Semiconducting lead compounds, Solar cells, Spectroscopy, Spin glass, Synthesis and characterizations, X ray diffraction analysis|
Many research efforts are focused toward significant improvements of polymeric solar cells efficiency, energy harvesting range, time, and environmental stability. Particular attention is given to hybrid organic/inorganic composites constituted of polymer/lead chalcogenides (PbS and PbSe) nanocrystals (NCs) to extend the spectral sensitivity of cells to near-infrared wavelengths. In this work we report the synthesis and characterization of PbS nanocrystals with absorption edge at 984 nm. The nanocrystals have a cubic crystal structure and size of about 2 nmas found by X-ray diffraction analysis. They were combined with poly(3-hexylthiophene) (P3HT) polymer to obtain P3HT:PbS blends with different PbS loadings. A postdeposition ligand exchange on PbS NCs by 1,2-ethanedithiol (EDT) allowed a better interaction between polymer and nanocrystals as showed by fluorescence measurements. The P3HT:PbS blends were deposited and treated by a layer by layer spin coating process and used as active layer in solar cells having structure glass/ITO/PEDOT:PSS/blend/Al. The major result obtained for this hybrid system is an increase of PCE by about two orders of magnitude with respect to analogous reported cells where a post-deposition ligand exchange was performed. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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