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Study of PbS Quantum Dots and Graphene Composite Materials Applied in Solar Cells

Author: ZhangZuo
Tutor: LiuYuanFu
School: Beijing Jiaotong University
Course: Materials Science
Keywords: PbS quantum dots heterojunction solar cells graphene compositematerials dye-sensitised solar cells
CLC: TM914.4
Type: Master's thesis
Year: 2014
Downloads: 91
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Abstract


ABSTRACT:Solar cells have broad application prospects and the obvious flaw of the existing solar cells, developing a new type of solar cells materials is imperative. Quantum dot materials and graphene materials have a lot of special photoelectric properties, which make them become the hot topic about the new solar cell materials. This dissertaion is focused on the study of PbS quantum dot material and graphene composite materials applied in solar cells. We prepared the PbS quantum dot material, graphene materials, silicon dioxide doped graphene composite material and manganese oxide doped graphene composite material, and appled them into solar cells.By using the method of chemical synthesis, the reactants dissolved into the organic system and then became the precursor, nucleations grew in high temperature instantaneously after the mixture, and then the reaction rapidly cooled to inhibition products continue to grow. The near infrared absorption spectra, XRD, TEM were used to characterize the products. The PbS quantum was proved to be less surface defects, obvious quantum confined effect, quantum size effect and the particle size distribute at about5nm. Then testing the Ⅰ-Ⅴ curve of PbS quantum dots and TiO2nanocrystal film heterojunction solar cells, we can find the efficiency up to0.65%. The cell structure is observed to be complete by scanning electron microscopy (SEM).Graphene oxide (GO) was used to prepare the graphene (RGO),which with the redox catalytic performance, by hydrazine hydrate thermal reduction method. SiO2was doped into the RGO, which has very stable chemical properties. Then RGO/SiO2composite material has prepared. RGO and RGO/SiO2composite materials were scraped to be counter electrodes (CEs). The XRD, XPS, SEM test methods were used to characterize the microstructure and enhancing mechanism of two kinds of materials. The CV, TAFEL, EIS test method were used to test the catalytic ability of two kinds of CEs. Two kinds of CEs were used into the dye-sensitized solar cells (DSSCs), the efficiency of DSSC with the RGO/SiO2CE achieved4.03%. By doping SiO2, the efficiency increased by37.5%.Mixed MnO2into the GO, the mixture was restored into Mn3O4/RGO composite materials after the joined hydrazine hydrate. XRD, XPS and FTIR, SEM, TEM, nitrogen adsorption/desorption experiment test methods were used to determine the phase composition and microstructure of RGO/Mn3O4. Then the different proportion of RGO and Mn3O4was prepared to be RGO/Mn3O4-1, RGO/Mn3O4-2, RGO/Mn3O4-3CEs. CV, TAFEL, EIS test method were used to test the catalytic ability of two kinds of CEs. Three kinds of CEs were used into the DSSCs, further tests shows that the RGO/Mn3O4-2has achieved the best5.90%. All the experimental processes are in the atmosphere environment, and the films are not easy to peel off, the method of preparation is simple. So the CEs have broad application prospects.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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