Minoli K. Pathirane

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The optics of core / shell nanowire solar cells was investigated. The optical wave propagation was studied by finite difference time domain simulations using realistic interface morphologies. The interface morphologies were determined by a 3D surface coverage algorithm, which provides a realistic film formation of amorphous silicon films on zinc oxide(More)
We experimentally demonstrate a new optical platform by integrating hydrogenated amorphous silicon nanowire arrays with thin films deposited on transparent substrates like glass. A 535 nm thick thin film is anisotropically etched to fabricate vertical nanowire arrays of 100 nm diameter arranged in a square lattice. Adjusting the nanowire length, and(More)
Disordered 3-D hybrid ZnO nanowire/a-Si:H thin-film radial-junction solar cells are directly fabricated onto flexible substrates. A 41% reduction in optical reflectivity resulted in a 15% increase in the current density when the substrate is mechanically bent concave-up toward the incoming light. The light scattering of the nanowire devices was enhanced by(More)
Abstract-This work reports an integration process for hydrogenated amorphous silicon (a-Si:H) thin-film transistor (TFT) backplanes on flexible plastic substrates that attempts to reduce the large misalignment between the successive patterned layers in fabrication. Here, a double-sided adhesive tape is used to attach the plastic substrate to a rigid(More)
The electrical stability of flexible a-Si:H thin-film transistors (TFT) under mechanical bending is given. The electrical stability was found to be dependent on the strain state of the applied bending during dc-gate bias of the TFT. The heterogeneous integration of hybrid thin-film/nanowire structures on polyeth ylene napthalate substrates is also(More)
Silver nanowires in conjunction with sputter-coated Al-doped ZnO (AZO) thin films were used as a composite transparent top electrode for hybrid radial-junction ZnO nanowire/a-Si:H p-i-n thin-film solar cells. Solar cells with the composite nanowire top contacts attained a short-circuit current density (Jsc) of 13.9 mA/cm2 and a fill factor (FF) of 62% on(More)
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