Photoluminescence and light reflectance properties of silica and titania nanoparticles (NPs) in two bilayer configurations were studied. In the first configuration, Titania and Silica NPs monolayers were deposited on a silicon wafer, the Titania NPs monolayer was the one in contact with the wafer and silica NPs was the top monolayer. The second configuration consisted in Silica NPs bilayer. The periodic monolayers were deposited by the spin coating technique. The concentration of colloidal suspension of NPs and their distribution over the surface were controlled by the revolutions per minute (rpm) during spin coating deposition. A set of samples were annealed with increments of 10 minutes, ranging from 0 min (i.e. not annealed) to 60 min. As well other samples were annealed during 2 and 3 hours, at 1,100 °C. The bilayers were characterized using several techniques as Fourier Transform Infrared Spectroscopy (FTIR), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), reflectance and photoluminescence (PL) measurements. For the first configuration, our results shown that for short annealing time the PL emission increased 6 times with respect to the non annealed sample. However, the light reflected by the first configuration is lower than the one reflected by the second configuration. These results can be attractive for light emitting devices as well as for absorbing layers on crystalline silicon solar cells.
Organic materials have become very important in recent years due to their potential use for photovoltaic applications. Among the main advantages of organic semiconductors are their functional and mechanical flexibility, as well as fabrication simplicity. However, these materials usually afford moderate efficiency in organic photovoltaic devices. On the other hand, hydrogenated amorphous silicon (a-Si:H) is a widely known inorganic semiconductor that compared to their organic counterparts has excellent photogeneration and transport properties and it is suitable for large area fabrication of flexible devices. The idea of combining organic semiconductors and amorphous silicon films in hybrid photovoltaic devices is very attractive due to the possibility to complement the useful properties of both material systems. The photovoltaic devices that we study in this work consist of a p-i-n structure, which is also commonly used in inorganic solar cells. In such kind of structures, the light is mainly absorbed in the intrinsic silicon film and the p- and ntype films are used to create an electric field that separates electrons and holes to produce a photocurrent. In this work, we use an organic material (PEDOT:PSS) to replace the p-type inorganic film in amorphous silicon p-i-n structure. It is widely known, that PEDOT:PSS based organic film is highly transparent and its conductivity can be modified e.g. immerse in a solvent type. Here we present the results of experimental investigation of the effect of isopropanol (IPA) treatments in p-type (PEDOT:PSS) organic layer on characteristics of hybrid solar cell structure.
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