Hybrid Solar Cells with Prescribed Nanoscale Morphologies Based on Hyperbranched Semiconductor Nanocrystals

Gur, Ilan; Fromer, Neil A.; Chen, Chih‐Ping; Kanaras, Antonios G.; Alivisatos, A. Paul

doi:10.1021/nl062660t

Cited by 480 publications

(394 citation statements)

References 29 publications

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“…For this purpose, branched and hyperbranched CdSe nanocrystals were developed and were found to improve device efficiency. 136,137 A Figure 21(a-c). The morphology of these hybrid blends, actually nanocomposites, can be optimized by mixed solvent casting processes or by vapor annealing.…”

Section: Polymer-inorganic Hybrid Solar Cellsmentioning

confidence: 99%

On the morphology of polymer‐based photovoltaics

Liu

Jung

et al. 2012

J Polym Sci B Polym Phys

307

248

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We review the morphologies of polymer-based solar cells and the parameters that govern the evolution of the morphologies and describe different approaches to achieve the optimum morphology for a BHJ OPV. While there are some distinct differences, there are also some commonalities. It is evident that morphology and the control of the morphology are important for device performance and, by controlling the thermodynamics, in particular, the interactions of the components, and by controlling kinetic parameters, like the rate of solvent evaporation, crystallization and phase separation, optimized morphologies for a given system can be achieved. While much research has focused on P3HT, it is evident that a clearer understanding of the morphology and the evolution of the morphology in low bad gap polymer systems will increase the efficiency further. While current OPVs are on the verge of breaking the 10% barrier, manipulating and controlling the morphology will still be key for device optimization and, equally important, for the fabrication of these devices in an industrial setting.

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Section: Polymer-inorganic Hybrid Solar Cellsmentioning

confidence: 99%

On the morphology of polymer‐based photovoltaics

Liu

Jung

et al. 2012

J Polym Sci B Polym Phys

307

248

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“…[1][2][3] Oxide materials can be cheap, abundant, stable, and their properties ͑i.e., band gap, conductivity, etc.͒ can be systematically tuned through chemical substitutions, making them promising candidates for thin-film photovoltaics. Additionally, ferroelectrics present an alternative pathway for charge separation of photoexcited carriers.…”

mentioning

confidence: 99%

Photovoltaic effects in BiFeO3

Yang

Martin

Byrnes

et al. 2009

Applied Physics Letters

488

329

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We report a photovoltaic effect in ferroelectric BiFeO3 thin films. The all-oxide heterostructures with SrRuO3 bottom and tin doped indium oxide top electrodes are characterized by open-circuit voltages ∼0.8–0.9 V and external quantum efficiencies up to ∼10% when illuminated with the appropriate light. Efficiencies are at least an order of magnitude larger than the maximum efficiency under sunlight (AM 1.5) thus far reported for ferroelectric-based devices. The dependence of the measured open-circuit voltage on film thickness suggests contributions to the large open-circuit voltage from both the ferroelectric polarization and band offsets at the BiFeO3/tin doped indium oxide interface.

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“…Using colloidal nanocrystals, researchers have explored carrier mobility and device performance in the context of low-resistivity percolation networks. Improving the percolation network (low-resistivity pathway for charge carriers) has steadily improved performance as devices have evolved from using spheres to randomly-oriented rods to hyperbranched particles 4,5 . An ideal device geometry would consist of a monolayer of vertically oriented rods (perpendicular to substrate) spanning the full thickness of the film.…”

mentioning

confidence: 99%

Device-Scale Perpendicular Alignment of Colloidal Nanorods

Baker¹,

Widmer‐Cooper²,

et al. 2009

Self Cite

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The self-assembly of nanocrystals enables new classes of materials whose properties are controlled by the periodicities of the assembly, as well as by the size, shape and composition of the nanocrystals. While selfassembly of spherical nanoparticles has advanced significantly in the last decade, assembly of rod-shaped nanocrystals has seen limited progress due to the requirement of orientational order. Here, the parameters critically relevant to self-assembly are systematically quantified using a combination of diffraction and theoretical modeling; these highlight the importance of kinetics on orientational order. Through dryingmediated self-assembly we achieve unprecedented control over orientational order (up to 96% vertically oriented rods on 1cm 2 areas) on a wide range of substrates (ITO, PEDOT:PSS, Si 3 N 4 ). This opens new avenues for nanocrystal-based devices competitive with thin film devices, as problems of granularity can be tackled through crystallographic orientational control over macroscopic areas.Colloidal nanocrystals offer a potential route to realizing low-cost solution-processed electronic devices. In particular, with their size-tunable properties, single-crystallinity, and inexpensive synthesis, semiconductor nanoparticles could enable improved optoelectronic devices. To date, however, the performance of nanoparticle devices has been limited, in large part, by the number of interfaces that charge carriers encounter before they can be collected; each interface presents an opportunity for recombination and subsequent charge loss or

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Hybrid Solar Cells with Prescribed Nanoscale Morphologies Based on Hyperbranched Semiconductor Nanocrystals

Cited by 480 publications

References 29 publications

On the morphology of polymer‐based photovoltaics

On the morphology of polymer‐based photovoltaics

Photovoltaic effects in BiFeO3

Device-Scale Perpendicular Alignment of Colloidal Nanorods

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