The Experts below are selected from a list of 11070 Experts worldwide ranked by ideXlab platform
Chen Qian - One of the best experts on this subject based on the ideXlab platform.
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effects of nitric phosphoric Acid Etches on properties of cdte thin films and back contacts of cdte solar cells
Chinese Journal of Materials Research, 2007Co-Authors: Chen QianAbstract:The CdTe thin films were etched with a mixture of nitric-phosphoric Acid in water (NP), and then several kinds of back contact materials were deposited respectively by co-evaporation in this paper. The effect of nitric-phosphoric Acid pretreatment on material properties and back contact formation of CdTe solar cells were investigated. The results show that the chemical etching produces a Te rich layer on the back surface of CdTe films and on grain boundaries, and this readily leads to the reaction with Cu or Cu-containing back contact materials and the formation of CuxTe after annealing. When etched under optimum conditions and used ZnTe/ZnTe:Cu as back-contact materials, the small area CdTe solar cells show high performance.
P Sheldon - One of the best experts on this subject based on the ideXlab platform.
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effect of nitric phosphoric Acid Etches on material properties and back contact formation of cdte based solar cells
Journal of Vacuum Science and Technology, 1999Co-Authors: David W Niles, F S Hasoon, Richard Matson, P SheldonAbstract:Forming a low-resistance contact to p-type CdTe is a critical issue for successful commercialization of CdTe-based photovoltaic devices. One solution to this problem has been to incorporate surface pretreatments to facilitate contact formation. In this article, the effects of a nitric–phosphoric (NP) Acid pretreatment on material properties and device performance are investigated for polycrystalline CdTe-based devices. We demonstrate that the NP Acid pretreatment, when applied to CdTe thin films, forms a thick, highly conductive Te layer on the back surface of the film and on exposed grain boundaries. When etched under optimal conditions, this results in CdS/CdTe devices with reduced series resistance and enhanced performance. On the other hand, we find that the NP etch preferentially Etches grain boundaries. Overetching can result in complete device failure by forming shunt paths that extend to the heterointerface. Therefore, carefully controlling the etch concentration and duration is critical to optimi...
David W Niles - One of the best experts on this subject based on the ideXlab platform.
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effect of nitric phosphoric Acid Etches on material properties and back contact formation of cdte based solar cells
Journal of Vacuum Science and Technology, 1999Co-Authors: David W Niles, F S Hasoon, Richard Matson, P SheldonAbstract:Forming a low-resistance contact to p-type CdTe is a critical issue for successful commercialization of CdTe-based photovoltaic devices. One solution to this problem has been to incorporate surface pretreatments to facilitate contact formation. In this article, the effects of a nitric–phosphoric (NP) Acid pretreatment on material properties and device performance are investigated for polycrystalline CdTe-based devices. We demonstrate that the NP Acid pretreatment, when applied to CdTe thin films, forms a thick, highly conductive Te layer on the back surface of the film and on exposed grain boundaries. When etched under optimal conditions, this results in CdS/CdTe devices with reduced series resistance and enhanced performance. On the other hand, we find that the NP etch preferentially Etches grain boundaries. Overetching can result in complete device failure by forming shunt paths that extend to the heterointerface. Therefore, carefully controlling the etch concentration and duration is critical to optimi...
Enedictus R. - One of the best experts on this subject based on the ideXlab platform.
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The influence of interlayer/epoxy adhesion on the mode-I and mode-II fracture response of carbon fibre/epoxy composites interleaved with thermoplastic veils
'Elsevier BV', 2020Co-Authors: Qua D., Ia Deega, Alderlieste R.c., Dransfeld C.a., Ivanković Alojz, Murphy Neal, Enedictus R.Abstract:The compatibility between the majority of thermoplastic veils (TPVs) and epoxies is typically poor, owing to the inherently low surface energies of thermoplastics. This tends to largely affect the toughening performance of TPVs as interlayer materials of carbon fibre/epoxy composites. The traditional methods for surface activation of thermoplastics, such as corona discharge, plasma treatment and Acid Etches, are not applicable to TPVs as they could cause significant damage to the thermoplastic fibres with nano-/micro-scale diameters. Herein, a UV-irradiation technique was proposed to active the surfaces of polyphenylene-sulfide (PPS) veils, that effectively improved their adhesion with epoxies. Consequently, the effects of an improved veil/epoxy adhesion on the mode-I and mode-II fracture behaviour and corresponding fracture mechanisms of the interleaved laminates were investigated. It was found that an improved veil/epoxy adhesion significantly enhanced the toughening performance of the PPS veils for the laminates manufactured by resin transfer moulding of non-crimp fabrics, by introducing additional carbon fibre delamination and significant PPS fibre damage during the fracture process. In contrast, the increased level of veil/epoxy adhesion inhibited PPS fibre bridging during the fracture process of the laminates produced from unidirectional prepregs, and caused considerable adverse effects on the fracture performance.Structural Integrity & CompositesAerospace Manufacturing Technologie
Richard Matson - One of the best experts on this subject based on the ideXlab platform.
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effect of nitric phosphoric Acid Etches on material properties and back contact formation of cdte based solar cells
Journal of Vacuum Science and Technology, 1999Co-Authors: David W Niles, F S Hasoon, Richard Matson, P SheldonAbstract:Forming a low-resistance contact to p-type CdTe is a critical issue for successful commercialization of CdTe-based photovoltaic devices. One solution to this problem has been to incorporate surface pretreatments to facilitate contact formation. In this article, the effects of a nitric–phosphoric (NP) Acid pretreatment on material properties and device performance are investigated for polycrystalline CdTe-based devices. We demonstrate that the NP Acid pretreatment, when applied to CdTe thin films, forms a thick, highly conductive Te layer on the back surface of the film and on exposed grain boundaries. When etched under optimal conditions, this results in CdS/CdTe devices with reduced series resistance and enhanced performance. On the other hand, we find that the NP etch preferentially Etches grain boundaries. Overetching can result in complete device failure by forming shunt paths that extend to the heterointerface. Therefore, carefully controlling the etch concentration and duration is critical to optimi...
