Search for dissertations about: "Buffer layer"
Showing result 11 - 15 of 95 swedish dissertations containing the words Buffer layer.
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11. Model-based Analysis and Design of Atomic Layer Deposition Processes
Abstract : Atomic layer deposition (ALD) is a thin-film manufacturing process in which the growth surface is exposed to non-overlapping alternating injections of gas-phase chemical precursor species separated by intermediate purge periods to prevent gas-phase reactions. ALD is characterized by sequential self-terminating heterogeneous reactions between highly reactive gas-phase precursor species and surface-bound species which, when allowed sufficient conditions to reach saturation, results in highly conformal films, on both planar and topographically complex structures. READ MORE
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12. Modelling Band Gap Gradients and Cd-free Buffer Layers in Cu(In,Ga)Se2 Solar Cells
Abstract : A deeper understanding of Cu(In,Ga)Se2 (CIGS) solar cells is important for the further improvement of these devices. This thesis is focused on the use of electrical modelling as a tool for pursuing this aim. Finished devices and individual layers are characterized and the acquired data are used as input in the simulations. READ MORE
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13. Design and Characterization of 1.3-1.6 µm Metamorphic Materials and Lasers on GaAs
Abstract : The development of fiber-optical networks for broad-band access is expected to create a huge market for laser transmitters in the 1.3-1.55 µm wavelength range. The existing InP-based lasers have poor temperature stability. READ MORE
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14. Metamorphic Heterostructures and Lasers on GaAs
Abstract : The objective of this thesis is to demonstrate the metamorphic growth of heterostructure lasers on GaAs substrates. Many heterostructure devices have their performance limited by the need to grow on lattice-matched substrates. READ MORE
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15. The role of the CdS buffer layer in the Cu(In,Ga)Se2 thin film solar cell
Abstract : The Cu(In,Ga)Se2 thin film solar cell is one of the most promising candidates for low-costand high-efficiency solar cells. To date efficiencies approaching 18% have been achieved whenincluding a thin CdS layer prepared by chemical bath deposition (CBD) between theCu(In,Ga)Se2 and ZnO layers. READ MORE