High-efficiency cascade CdS/CdSe quantum dot-sensitized solar cells based on hierarchical tetrapod-like ZnO nanoparticles

Cheng, Hsu-Yung; Huang, Kuo Yen; Lee, Kun‐Mu; Yu, Pyng; Lin, Shih Chin; Huang, Jin; Wu, Chun Guey; Tang, Jau

doi:10.1039/c2cp41760j

Cited by 47 publications

(25 citation statements)

References 76 publications

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“…Furthermore, a photoelectrode film constructed with these nanostructures is helpful for the distribution of QDs (25). ZnO-nanostructured photoelectrodes for QDSCs have been investigated over the last several years (53–57). However, the efficiency of ZnO-based QDSCs is lower than that of TiO 2 -based devices, which is likely due to the high surface charge recombination in ZnO (58, 59).…”

Section: Nanocrystalline Photoelectrodes For Solar Cellsmentioning

confidence: 99%

Semiconductor quantum dot-sensitized solar cells

2013

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Semiconductor quantum dots (QDs) have been drawing great attention recently as a material for solar energy conversion due to their versatile optical and electrical properties. The QD-sensitized solar cell (QDSC) is one of the burgeoning semiconductor QD solar cells that shows promising developments for the next generation of solar cells. This article focuses on recent developments in QDSCs, including 1) the effect of quantum confinement on QDSCs, 2) the multiple exciton generation (MEG) of QDs, 3) fabrication methods of QDs, and 4) nanocrystalline photoelectrodes for solar cells. We also make suggestions for future research on QDSCs. Although the efficiency of QDSCs is still low, we think there will be major breakthroughs in developing QDSCs in the future.

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Section: Nanocrystalline Photoelectrodes For Solar Cellsmentioning

confidence: 99%

Semiconductor quantum dot-sensitized solar cells

2013

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“…Cheng [76] fabricated composite photoanodes using ZnO tetrapods, CdS and CdSe quantum dots. The preliminary CdS layer was energetically favourable toward electron transfer and behaved as a passivation layer to diminish the formation of interfacial defects during CdSe synthesis.…”

Section: Usage Of Zno Nanotetrapods As Photoanodic Materials In Dsscsmentioning

confidence: 99%

ZnO Tetrapods: Synthesis and Applications in Solar Cells

Yan

Uddin

Wang

2015

Nanomaterials and Nanotechnology

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Zinc oxide (ZnO) tetrapods have received much interest due to their unique morphology, that is, four arms connected to one centre. Tetrapod networks possess the excellent electronic properties of the ZnO semiconductor, which is attractive for photoelectrode materials in energyconversion devices because of their advantages in electron extraction and transportation. In this review, we have discussed recent advancements in the field of ZnO tetrapod synthesis, including vapour transport synthesis and the wet chemical method, together with their advantages and disadvantages in terms of morphology control and yield regulation. The developments and improvements in the applications of ZnO nanotetrapods in photovoltaics, including dye-sensitized solar cells and polymer solar cells, are also described. Our aim is to give readers a comprehensive and critical overview of this unique morphology of ZnO, including synthesis control and growth mechanism, and to understand the role of this particular morphology in the development of solar cells. The future research directions in ZnO tetrapods-based solar cell are also discussed.

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“…Similar to the dye sensitization presented above, quantum dots functionalization of ZnO nanostructures has been mostly exploited for light harvesting application in semiconductor or hybrid solar cells . The role of the QDs is the generation of excited electrons upon photoirradiation to be injected in the conduction band of the zinc oxide photoanode.…”

Section: Surface‐engineering Of Zno Nanostructures With Nanoparticlesmentioning

confidence: 99%

Surface Engineering of Nanostructured ZnO Surfaces

Laurenti

Stassi

Canavese

et al. 2016

Adv Materials Inter

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are oriented in one direction and their assembly and stacking produces the wurtzite hexagonal symmetry. The noncentrosymmetric and anisotropic crystalline structure of wurtzite-like ZnO generates very interesting properties such as piezo-and pyro-electricity: the application of an external stimulus, like mechanical stress or temperature, deforms the tetrahedron structure. This deformation results in a separation between the positive and negative centers of charge, inducing the formation of a dipole moment. [7,8] The polar surface and anisotropic structure of ZnO can be usefully exploited to form different kinds of micro and nanostructures from 0D to 3D, [5] including, but not limited to nanowires, [9][10][11][12] nanotubes, [13,14] nanobelts, [15][16][17][18][19] nanorings, [20] flower-like morphologies, [21][22][23][24][25] multipods, [26,27] tetrapods, [28][29][30] sponge-like structures [31][32][33][34] and so on [29,[35][36][37][38][39] (Figure 1). Therefore, several research efforts have been invested in studying various preparation procedures for ZnO micro and nano-materials. Wet chemical approaches, like sol-gel, hydrothermal growths, electrodeposition and template-assisted routes, [40,41] as well as vapor-phase methods, for example chemical vapour deposition (CVD), physical vapour deposition (PVD) including sputtering and evaporation approaches, [42][43][44] and epitaxial growth methods [45] are among the most used ones. The great advantages of the wet chemical approaches are the high synthesis versatility, low temperature employed and low costs. [9] From the other side, dry methods take advantage of the high quality and excellent control over the level of crystallinity of the synthesized ZnO structures, as well as the absence of contamination and high purity of the final material. [46] The combination of different properties with the ease and high versatile synthesis of ZnO material in different micro and nanostructures offers a huge possibility of potential applications.For example, ZnO is already used as an efficient catalyst in the selective oxidation of involving oxygenates (i.e., alcohols, aldehydes, and carboxylic acids) and in methanol synthesis catalysts. It is also largely applied as protective, anti-corrosion layer in galvanized steel products, [49][50][51] as well as in paints and sunscreens as an UV absorber. Its biocompatibility makes this material suitable, in the form of microparticles, for paste formulations in cosmetic applications.The combination of the piezoelectric with the semiconducting properties of ZnO is found to result into new exciting physical properties, [52][53][54] and it has recently opened the research field to energy harvesting application. ZnO nanomaterials can be thus used as nanogenerators, able to convert the mechanical deformation from the surrounding environment into electrical Zinc Oxide (ZnO) nanostructures represent promising substrate materials for numerous applications, ranging from new generation solar cells, to bio-and chemical sensors. This interest is due ...

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High-efficiency cascade CdS/CdSe quantum dot-sensitized solar cells based on hierarchical tetrapod-like ZnO nanoparticles

Cited by 47 publications

References 76 publications

Semiconductor quantum dot-sensitized solar cells

Semiconductor quantum dot-sensitized solar cells

ZnO Tetrapods: Synthesis and Applications in Solar Cells

Surface Engineering of Nanostructured ZnO Surfaces

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