Hybrid conjugated polymer solar cells using patterned GaAs nanopillars

Mariani, Giacomo; Laghumavarapu, Ramesh B.; Villers, Bertrand J. Tremolet de; Shapiro, Jenessa R.; Senanayake, Pradeep; Lin, Andrew; Schwartz, Benjamin J.; Huffaker, Diana L.

doi:10.1063/1.3459961

Cited by 64 publications

(42 citation statements)

References 15 publications

(14 reference statements)

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“…This is because the density of surface states at the polymer/GaAs interface has a particularly large effect on the J sc , as the highest charge carrier generation region is at this interface. Therefore, reducing the surface recombination at the polymer/ GaAs interface would increase the J sc [14]. In fact, similar behavior has been observed in Si based hybrid Schottky junction type solar cells [17].…”

Section: Resultsmentioning

confidence: 66%

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Orientation effect on GaAs/ultrathin polymer/PEDOT:PSS hybrid solar cell

Yan¹,

You²

2015

Organic Electronics

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Section: Resultsmentioning

confidence: 66%

“…It has been found that surface passivation can largely reduce the density of surface states and lower surface non-radiative recombination [14]. The lower density of surface states would also reduce the Fermi level pining effect, to enhance the built-in electrical field in the solar cell, leading to higher open circuit voltage [9].…”

Section: Resultsmentioning

confidence: 99%

Orientation effect on GaAs/ultrathin polymer/PEDOT:PSS hybrid solar cell

Yan¹,

You²

2015

Organic Electronics

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“…Surface passivation aims to rebond these dangling bonds with certain passivating agents while maintaining charge neutrality after the passivation [45]. For instance, one recent study of hybrid solar cells based on poly (3-hexylthiophene) and GaAs nanopillars [40] shows that the surface passivation is crucial to alleviate the surface states on the nanopillar facets, leading to a much enhanced efficiency. Nonetheless, only simple inorganic molecules were adopted (e.g.…”

Section: Surface Passivationmentioning

confidence: 99%

“…nanowires). For instance, hybrid solar cells can be created by coating poly (3-hexylthiophene) (P3HT) on GaAs nanowires by carefully tuning the spincoating conditions [40]. A standard fabrication process is presented in Fig.…”

Section: Controlled Spin-coatingmentioning

confidence: 99%

Hybrid Solar Cells: Materials, Interfaces, and Devices

Mariani

Wang

Kaner

et al. 2013

High-Efficiency Solar Cells

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Photovoltaic technologies could play a pivotal role in tackling future fossil fuel energy shortages, while significantly reducing our carbon dioxide footprint. Crystalline silicon is pervasively used in single junction solar cells, taking up 80 % of the photovoltaic market. Semiconductor-based inorganic solar cells deliver relatively high conversion efficiencies at the price of high material and manufacturing costs. A great amount of research has been conducted to develop low-cost photovoltaic solutions by incorporating organic materials. Organic semiconductors are conjugated hydrocarbon-based materials that are advantageous because of their low material and processing costs and a nearly unlimited supply. Their mechanical flexibility and tunable electronic properties are among other attractions that their inorganic counterparts lack. Recently, collaborations in nanotechnology research have combined inorganic with organic semiconductors in a "hybrid" effort to provide high conversion efficiencies at low cost. Successful integration of these two classes of materials requires a profound understanding of the material properties and an exquisite control of the morphology, surface properties, ligands, and passivation techniques to ensure an optimal charge carrier generation across the hybrid device. In this chapter, we provide background information of this novel, emerging field, detailing the various approaches for obtaining inorganic nanostructures and organic polymers, introducing a multitude of methods for combining the two components to achieve the desired morphologies, and emphasizing the importance of surface manipulation. We highlight several studies that have fueled new directions for hybrid solar cell research, including approaches for maximizing efficiencies by controlling the morphologies of the inorganic component, and in situ molecular engineering via electrochemical polymerization of a polymer directly onto the inorganic nanowire surfaces. In the end, we provide some possible future directions for advancing the field, with a focus on flexible, lightweight, semitransparent, and low-cost photovoltaics.

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“…1 Many SAE-NW-based devices have recently been demonstrated including photonic crystal cavities, 2 Fabry-Perot resonators, 3 lasers, 4 photo-detectors, 5,6 and various solar cell designs. [7][8][9] In addition, research demonstrating the direct growth of compound semiconductor SAE-NWs on silicon has shown a pathway to direct integration of photonic devices onto CMOS chips, possibly providing a much sought after solution to a long standing technical challenge. 10,11 A major advantage of the SAE technique over other growth methods is the inherent lithographic control of the location and size of the wires; making it possible to design site-controlled, arraybased devices.…”

mentioning

confidence: 99%

Evolution of GaAs nanowire geometry in selective area epitaxy

Bassett

Mohseni

2015

Applied Physics Letters

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Nanowires (NWs) grown via selective area epitaxy (SAE) show great promise for applications in next generation electronic and photonic devices, yet the design of NW-based devices can be complicated due to the complex kinetics involved in the growth process. The presence of the patterned selective area mask, as well as the changing geometry of the NWs themselves during growth, leads to non-linear growth rates which can vary significantly based on location in the mask and the NW size. Here, we present a systematic study of the evolution of GaAs NW geometry during growth as a function of NW size and pitch. We highlight a breakdown of NW uniformity at extended growth times, which is accelerated for NW arrays with larger separations. This work is intended to outline potential fundamental growth challenges in achieving desired III–V NW array patterns and uniformity via SAE.

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Hybrid conjugated polymer solar cells using patterned GaAs nanopillars

Cited by 64 publications

References 15 publications

Orientation effect on GaAs/ultrathin polymer/PEDOT:PSS hybrid solar cell

Orientation effect on GaAs/ultrathin polymer/PEDOT:PSS hybrid solar cell

Hybrid Solar Cells: Materials, Interfaces, and Devices

Evolution of GaAs nanowire geometry in selective area epitaxy

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