基于TiO_2纳米棒阵列的CdS量子点敏化太阳电池研究_英文_
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Key words: TiO2ቤተ መጻሕፍቲ ባይዱ array; solar cells; CdS; quantum dots
Dye-sensitized solar cells (DSSCs) based on TiO2, ZnO or SnO2 nanocrystalline electrodes are currently attracting academic and industrial interest for the conversion of sunlight into electricity for their low lost and environmentally friendly photovoltaic with good efficiencies comparable to those silicon cells[1-3]. DSSCs are based on the photosensitization of mesoporous TiO2 semiconductor electrodes by absorbed dye[4, 5]. Ruthenium complexes and organic dye molecules are usually used as the sensitizers of DSSCs, and the power conversion efficiency up to 12.3% has been achieved[6,7]. However, the dyes have a low stability under the simulated sunlight illumination, which restricts the performance of DSSCs[8]. Many attempts have been made to improve the cell performance.
Rare Metal Materials and Engineering Volume 43, Issue 3, March 2014 Online English edition of the Chinese language journal
Cite this article as: Rare Metal Materials and Engineering, 2014, 43(3): 0525-0529.
sensitized array anodes, and their energy conversion efficiencies are still low[22, 23].
Recently, Liu and Aydil have developed a facile and environment-friendly route for growing single-crystal TiO2 NR arrays on the fluorine-doped tin oxide (FTO) glass[24]. A high efficiency of about 3% power conversion was achieved by assembling it into a DSSC. However, the reports on QDs sensitized TiO2 NRA solar cells were still few, to the best of our knowledge[25-27]. In this work, we prepared CdS QDs sensitized TiO2 NR arrays and assembled them into the QDSCs by a simple CBD method, then investigated the influence of CBD circles on the power conversion efficiency (PCE) of QDSCs. It was also found that these solar cells exhibit a high PCE of about 1.28%.
As an alternative of the dyes, the semiconductor quantumdots (QDs) which absorb light in the visible region, such as CdS, CdSe, PbS, PbSe, and InP, display excellent properties as the sensitizers of DSSCs[9-13]. QDs have the merits of a broad absorption spectrum, and a tunable bandgap energy, in contrast with the narrow absorption spectra typically existing in the molecule dyes[14, 15]. Additionally, using a QD, it is possible to use hot electrons to generate multiple electron-hole
Received date: April 17, 2013 Foundation item: Youth Foundation of China University of Mining and Technology (2009A55); Priority Academic Program Development of Jiangsu Higher Education Institutions Corresponding author: Gu Xiuquan, Ph. D., Lecturer, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China, E-mail: xqgu@cumt.edu.cn
Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.
Gu Xiuquan et al. / Rare Metal Materials and Engineering, 2014, 43(3): 0525-0529
pairs per photons through the impact ionization effect[16]. In a word, the solar cells containing QDs have a potential for low cost and high efficiency. A few initial results have shown a significant promise for obtaining high internal quantum efficiencies. For instance, a photon to electron conversion efficiency up to 700% has been claimed by Nozik et al.[17] Very recently, Beard and coworkers reported on a peak external photocurrent quantum efficiency exceeding 100 % via multiple electron generation (MEG) in a quantum dot sensitized solar cell (QDSC)[18].
Abstract: Chemical bath deposition (CBD) was used to assemble cadmium sulfide (CdS) quantum-dots (QD) onto single-crystal TiO2 nanorod arrays (NRA) for QD sensitized solar cell applications. The well crystallized CdS QDs were observed on the nanorod (NR) surface by the scanning and transmission electron microscopy (SEM, TEM) and other methods. In addition, a clear photovoltaic behaviour was also demonstrated through fabricating a solar cell. A power conversion efficiency of ~1.28% was obtained by optimizing the parameters of the photoanodes. The poor cell performance might be mainly attributed to the slow electron transfer process occurring between the adjacent QDs.
ARTICLE
Quantum Dot Sensitized Solar Cells Based on CdS Sensitized TiO2 Nanorod Arrays
Gu Xiuquan1,2, Song Duanming1, Zhao Yulong1, Qiang Yinghuai1
1 China University of Mining and Technology, Xuzhou 221116, China; 2 State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
Like the sensitizers, the photoanode is also a key component which determines the absorbed amount of the dye molecules and the transport rate or the lifetime of charges. Highly oriented TiO2 single-crystalline NRs grown on transparent conductive substrates have been considered so far the optimum choice as the electrode materials[19-21]. It is because such a structure not only provides a rapid, direct path for electron transport, but also shows a strong light scattering effect, so that the sunlight can be harvested effectively. Despite the advantages known for using the electrodes of TiO2 NRA, there are few studies devoted to the solar cells based on the QDs
Dye-sensitized solar cells (DSSCs) based on TiO2, ZnO or SnO2 nanocrystalline electrodes are currently attracting academic and industrial interest for the conversion of sunlight into electricity for their low lost and environmentally friendly photovoltaic with good efficiencies comparable to those silicon cells[1-3]. DSSCs are based on the photosensitization of mesoporous TiO2 semiconductor electrodes by absorbed dye[4, 5]. Ruthenium complexes and organic dye molecules are usually used as the sensitizers of DSSCs, and the power conversion efficiency up to 12.3% has been achieved[6,7]. However, the dyes have a low stability under the simulated sunlight illumination, which restricts the performance of DSSCs[8]. Many attempts have been made to improve the cell performance.
Rare Metal Materials and Engineering Volume 43, Issue 3, March 2014 Online English edition of the Chinese language journal
Cite this article as: Rare Metal Materials and Engineering, 2014, 43(3): 0525-0529.
sensitized array anodes, and their energy conversion efficiencies are still low[22, 23].
Recently, Liu and Aydil have developed a facile and environment-friendly route for growing single-crystal TiO2 NR arrays on the fluorine-doped tin oxide (FTO) glass[24]. A high efficiency of about 3% power conversion was achieved by assembling it into a DSSC. However, the reports on QDs sensitized TiO2 NRA solar cells were still few, to the best of our knowledge[25-27]. In this work, we prepared CdS QDs sensitized TiO2 NR arrays and assembled them into the QDSCs by a simple CBD method, then investigated the influence of CBD circles on the power conversion efficiency (PCE) of QDSCs. It was also found that these solar cells exhibit a high PCE of about 1.28%.
As an alternative of the dyes, the semiconductor quantumdots (QDs) which absorb light in the visible region, such as CdS, CdSe, PbS, PbSe, and InP, display excellent properties as the sensitizers of DSSCs[9-13]. QDs have the merits of a broad absorption spectrum, and a tunable bandgap energy, in contrast with the narrow absorption spectra typically existing in the molecule dyes[14, 15]. Additionally, using a QD, it is possible to use hot electrons to generate multiple electron-hole
Received date: April 17, 2013 Foundation item: Youth Foundation of China University of Mining and Technology (2009A55); Priority Academic Program Development of Jiangsu Higher Education Institutions Corresponding author: Gu Xiuquan, Ph. D., Lecturer, School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, P. R. China, E-mail: xqgu@cumt.edu.cn
Copyright © 2014, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.
Gu Xiuquan et al. / Rare Metal Materials and Engineering, 2014, 43(3): 0525-0529
pairs per photons through the impact ionization effect[16]. In a word, the solar cells containing QDs have a potential for low cost and high efficiency. A few initial results have shown a significant promise for obtaining high internal quantum efficiencies. For instance, a photon to electron conversion efficiency up to 700% has been claimed by Nozik et al.[17] Very recently, Beard and coworkers reported on a peak external photocurrent quantum efficiency exceeding 100 % via multiple electron generation (MEG) in a quantum dot sensitized solar cell (QDSC)[18].
Abstract: Chemical bath deposition (CBD) was used to assemble cadmium sulfide (CdS) quantum-dots (QD) onto single-crystal TiO2 nanorod arrays (NRA) for QD sensitized solar cell applications. The well crystallized CdS QDs were observed on the nanorod (NR) surface by the scanning and transmission electron microscopy (SEM, TEM) and other methods. In addition, a clear photovoltaic behaviour was also demonstrated through fabricating a solar cell. A power conversion efficiency of ~1.28% was obtained by optimizing the parameters of the photoanodes. The poor cell performance might be mainly attributed to the slow electron transfer process occurring between the adjacent QDs.
ARTICLE
Quantum Dot Sensitized Solar Cells Based on CdS Sensitized TiO2 Nanorod Arrays
Gu Xiuquan1,2, Song Duanming1, Zhao Yulong1, Qiang Yinghuai1
1 China University of Mining and Technology, Xuzhou 221116, China; 2 State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310027, China
Like the sensitizers, the photoanode is also a key component which determines the absorbed amount of the dye molecules and the transport rate or the lifetime of charges. Highly oriented TiO2 single-crystalline NRs grown on transparent conductive substrates have been considered so far the optimum choice as the electrode materials[19-21]. It is because such a structure not only provides a rapid, direct path for electron transport, but also shows a strong light scattering effect, so that the sunlight can be harvested effectively. Despite the advantages known for using the electrodes of TiO2 NRA, there are few studies devoted to the solar cells based on the QDs