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Assembly of Organic Molecular Containing Conjugate Groups on Monocrystalline Silicon and Photoelectric Properties after Assemblies

Author: LiJun
Tutor: XuQingHong
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Monocrystalline Organic modifier Polyaniline Sodium copper chlorophyllin Photoelectric conversion
CLC: O472
Type: Master's thesis
Year: 2011
Downloads: 19
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Abstract


The high-purity single-crystal silicon because of its good semiconducting properties, not only is the basic material of the modern information industry, and is the most common photovoltaic cell materials. Existing processes and conditions, speaking from the battery performance, single crystal silicon is an ideal material for the manufacture of solar cells. Therefore, how to more effectively improve the monocrystalline silicon photoelectric conversion efficiency monocrystalline silicon solar cell research at this stage, the most urgent problem. The this thesis advantage of the photoelectric conversion of the single crystal silicon material containing a conjugated organic molecules of the group to be modified on the monocrystalline silicon surface modification, preparation of a series of conjugated organic systems / n-type monocrystalline silicon composites to increase efficiency. The main work is as follows: 1. Sulfonated polyaniline / n-type monocrystalline silicon composites and optoelectronic properties of: Si-C bond will bromoaniline amino phenylacetylene pre of aminostyrene three organic molecules assembled to the n-type monocrystalline silicon surface and substrate Polyaniline conjugated system makes polyaniline system through the following three ways that directly assembled,-C = C-key assembly-CC-bond assembly to single Finally, the surface of the crystalline silicon, the introduction of sulfonate groups in the polyaniline system, to achieve the purpose of organically modified silicon surface. The results show that, due to the presence of the sulfonate groups, so that the potential of the wafer surface after the modification is changed, resulting in open light when the voltage value is moved to the negative voltage direction. Since polyaniline itself conjugated system, when directly connected to the silicon surface, the light current density greater than the density of the-C = C-bond and-CC-bond bridge photocurrent, while polyaniline by - C = C-key and the monocrystalline silicon surface is connected also to form a conjugated system, the photocurrent density is greater than the light when the current density values ??in the A-CC-bond connected. Sodium copper chlorophyllin and its derivatives / Preparation and photoelectric properties of n-type monocrystalline silicon composite to replace sodium copper chlorophyllin (SCC): C ≡ C bond molecular end of the C = C bond, was prepared containing C ≡ C bond sodium copper chlorophyllin (SCCa). And based on this success, SCC and SCCa molecules were assembled into the silicon surface such that the two molecules within the porphyrin ring through-C = C-bond and-CC-key grafted onto the Si atom to prepare a SCC / n-type monocrystalline silicon composite material and SCCA / n-type monocrystalline silicon composite material. The results show that the conjugated system, due to the porphyrin ring itself is a conjugated system, when the by-C = C-bond grafted onto the silicon surface, the porphyrin ring with the-C = C-bond together constitute more for electron transfer promoting effect, when assembled into the monocrystalline silicon surface porphyrin ring through-CC-bond,-CC-key itself does not exist conjugated effect, so its presence is hindered between the electron in the monocrystalline silicon with the porphyrin ring the transmission, and thus led to the SCCA / n-type monocrystalline silicon photocurrent density of the composite material is greater than of SCC / n-type monocrystalline silicon composite material.

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