CuInSe<sub>2</sub> Quantum Dot Solar Cells with High Open-Circuit Voltage

Panthani, Matthew G.; Stolle, C. Jackson; Reid, Dariya K.; Rhee, Dong Joon; Harvey, Taylor B.; Akhavan, Vahid A.; Yu, Yixuan; Korgel, Brian A.

doi:10.1021/jz4010015

Cited by 140 publications

(165 citation statements)

References 40 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] For example, CuInS 2 NCs are regarded as promising candidates as light absorber or counter electrode (CE) in dye-sensitized solar cells (DSSCs), due to the advantage of low cost and simple fabrication process. [18][19][20][21][22][23] Because the electronic structure of these materials strongly correlate with the [Cu]/[In] ratios, there is a great need to precisely control their size, shape, surface and compositions.…”

Section: Introductionmentioning

confidence: 99%

Template Synthesis of CuInS₂ Nanocrystals from In₂S₃ Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

et al. 2015

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We report the room temperature template synthesis of CuInS 2 nanocrystals through incorporation of Cu + cations into In 2 S 3 nanoplates whose chemical composition has been controlled by varying the amount of copper ions in the reaction mixture. As a result, bandgaps of the resultant CuInS 2 nanoplates can be tuned from 1.45 to 1.19 eV with [Cu]/[In] molar ratios increasing from 0.7 to 2.9, which was demonstrated by the cyclic voltammetry. We explored the use of CuInS 2 nanocrystals as potential counter electrode in dye-sensitized solar cells and a power conversion efficiency of 6.83 % was achieved without selenization and ligand exchange. The value is comparable with the performance of control device using a Pt as counter electrode (power conversion efficiency: 7.08 %) under the same device architecture. IntroductionTernary and quaternary semiconductor nanocrystals (NCs) (e.g., CuInS 2 , CuInSe 2 , CuInGaS 2 , CuZnSnS 4 ) with advantages of tunable bandgaps and more environmentally friendly constituents have been receiving great attentions for solar-harvesting and light-emitting applications, in particular for solution-processed devices. 1-17 For example, CuInS 2 NCs are regarded as promising candidates as light absorber or counter electrode (CE) in dye-sensitized solar cells (DSSCs), due to the advantage of low cost and simple fabrication process. 18-23 Because the electronic structure of these materials strongly correlate with the [Cu]/[In] ratios, there is a great need to precisely control their size, shape, surface and compositions. 3,19,24,25 Although great success has been made in synthesis of ternary and quaternary NCs, providing several routes including thermal decomposition of single precursors, 26-30 solvothermal synthesis approach, 31-33 hot-injection 4,5,34-36 and non-injection methods, 7, 37-41 the different reactivity of metallic cation precursors often leads to a poor stoichiometric control and the formation of intermediate products such as biphasic nanomaterials and heterostructures. [42][43][44][45] To overcome such drawbacks of the composition control,

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Section: Introductionmentioning

confidence: 99%

Template Synthesis of CuInS₂ Nanocrystals from In₂S₃ Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

et al. 2015

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“…[19][20][21][22][23] Moreover, these NCs display band-gaps of 4 <1.5 eV, which are in the visible region of the solar spectrum, and large absorption coefficients that are ideal for solar energy conversion. [24][25][26] In this context, there are few reports available demonstrating the photocatalytic activity of these NCs, and in all cases they were used in sensitizing wide band-gap semiconductors (e.g., ZnS, ZnO, and TiO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Investigating the Control by Quantum Confinement and Surface Ligand Coating of Photocatalytic Efficiency in Chalcopyrite Copper Indium Diselenide Nanocrystals

et al. 2016

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ABSTRACT:In the past few years, there has been an immense interest in the preparation of sustainable photocatalysts composed of semiconductor nanocrystals (NCs) as one of their component. We report here, for the first time, the effects of structural parameters of copper indium diselenide (CuInSe 2 ) NCs on visible light driven photocatalytic degradation of pollutants under homogeneous conditions. Ligand exchange reactions were performed replacing insulating, oleylamine capping with poly(ethylene glycol) thiols to prepare PEG-thiolate-capped, 1.8 to 5.3 nm diameter CuInSe 2 NCs to enhance their solubility in water. This unique solubility property caused inner-sphere electron transfer reactions (O 2 to O 2 −) to occur at the NCs surface allowing for sustainable photocatalytic reactions. Electrochemical characterization of our dissolved CuInSe 2 NCs showed that the thermodynamic driving force (-ΔG) for oxygen reduction, which increased with decreased NCs size, was the dominant contributor to the overall process when compared to the contribution light absorption and the coulombic interaction energies of electronhole pair (J e/h ). A two-fold increase in phenol degradation efficiency (from 30 to ~60%) was achieved by controlled variation of the diameter of CuInSe 2 NCs from 5.3 to 1.8 nm. The surface ligand dependency of photocatalytic efficiency was also investigated and a profound effect on phenol degradation was observed. Our PEG-thiolate-capped CuInSe 2 NCs showed photocatalytic activity towards other organic compounds, such as N, N-dimethyl-4-phenylenediamine, methylene blue, and thiourea, which showed decomposition under visible light.3

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“…17 In this Letter, we report a more extensive set of size-dependent TAS measurements of CuInSe 2 nanocrystal dispersions to determine the CM efficiency, the energy threshold for CM, the carrier cooling rates, absorption cross sections, and Auger lifetimes of CuInSe 2 nanocrystals. The CuInSe 2 nanocrystals had slightly lower CM threshold energy, longer Auger lifetimes, and similar CM efficiency as compared to spherical PbSe nanocrystal quantum dots.TAS measurements were performed on CuInSe 2 nanocrystals of three different sizes synthesized using the methods of Panthani et al 19 (see Supporting Information for Experimental Details). Figure 1 shows transmission electron microscopy (TEM) and UV−vis absorbance spectra of the nanocrystals, which have average diameters of 4.5 ± 0.8, 6.2 ± 1.5, and 9.2 ± 3.2 nm.…”

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confidence: 99%

Efficient Carrier Multiplication in Colloidal CuInSe₂ Nanocrystals

Stolle

Schaller

Korgel

2014

J. Phys. Chem. Lett.

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Transient absorption spectroscopy (TAS) was used to study carrier multiplication (CM) (also called multiexciton generation (MEG)) in solvent-dispersed colloidal CuInSe2 nanocrystals with diameters as small as 4.5 nm. Size-dependent carrier cooling rates, absorption cross sections, and Auger lifetimes were also determined. The energy threshold for CM in the CuInSe2 nanocrystals was found to be 2.4 ± 0.2 times the nanocrystal energy gap (Eg) and the CM efficiency was 36 ± 6% per unit Eg. This is similar to other types of nanocrystal quantum dot materials.

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CuInSe₂ Quantum Dot Solar Cells with High Open-Circuit Voltage

Cited by 140 publications

References 40 publications

Template Synthesis of CuInS₂ Nanocrystals from In₂S₃ Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

Template Synthesis of CuInS₂ Nanocrystals from In₂S₃ Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

Investigating the Control by Quantum Confinement and Surface Ligand Coating of Photocatalytic Efficiency in Chalcopyrite Copper Indium Diselenide Nanocrystals

Efficient Carrier Multiplication in Colloidal CuInSe₂ Nanocrystals

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CuInSe2 Quantum Dot Solar Cells with High Open-Circuit Voltage

Cited by 140 publications

References 40 publications

Template Synthesis of CuInS2 Nanocrystals from In2S3 Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

Template Synthesis of CuInS2 Nanocrystals from In2S3 Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

Investigating the Control by Quantum Confinement and Surface Ligand Coating of Photocatalytic Efficiency in Chalcopyrite Copper Indium Diselenide Nanocrystals

Efficient Carrier Multiplication in Colloidal CuInSe2 Nanocrystals

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Product

Resources

About

CuInSe₂ Quantum Dot Solar Cells with High Open-Circuit Voltage

Template Synthesis of CuInS₂ Nanocrystals from In₂S₃ Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

Template Synthesis of CuInS₂ Nanocrystals from In₂S₃ Nanoplates and Their Application as Counter Electrodes in Dye-Sensitized Solar Cells

Efficient Carrier Multiplication in Colloidal CuInSe₂ Nanocrystals