High Efficiency Graphene Solar Cells by Chemical Doping

Miao, Xiaochang; Tongay, Sefaattin; Petterson, M.; Berke, Kara; Rinzler, Andrew G.; Appleton, B. R.; Hebard, A. F.

doi:10.1021/nl204414u

Cited by 897 publications

(685 citation statements)

References 24 publications

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“…Moreover, graphene‐based solar cells are also the subjects of photovoltaic studies 188. To improve the efficiency of DSSCs, a wide‐bandgap semiconductor is needed that would be able to adsorb active dyes and transport the injected electrons into an electrical circuit.…”

Section: Foreseen Applicationsmentioning

confidence: 99%

“…It is because of the broad range of possibility of tuning graphene work function, its superior electrical and optical properties, and, last but not the least, the cost factor. It has been reported that chemical doping of graphene with bis(triofluoromethanesulfpnyl) amide increased the performance of undoped device over four times 188. An increase in the efficiency was linked to the shift in the graphene chemical potentials and to an increase in the carrier density.…”

Section: Foreseen Applicationsmentioning

confidence: 99%

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Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Bandosz

Ania

2018

Advanced Science

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Even though, owing to the complexity of nanoporous carbons' structure and chemistry, the origin of their photoactivity is not yet fully understood, the recent works addressed here clearly show the ability of these materials to absorb light and convert the photogenerated charge carriers into chemical reactions. In many aspects, nanoporous carbons are similar to graphene; their pores are built of distorted graphene layers and defects that arise from their amorphicity and reactivity. As in graphene, the photoactivity of nanoporous carbons is linked to their semiconducting, optical, and electronic properties, defined by the composition and structural defects in the distorted graphene layers that facilitate the exciton splitting and charge separation, minimizing surface recombination. The tight confinement in the nanopores is critical to avoid surface charge recombination and to obtain high photochemical quantum yields. The results obtained so far, although the field is still in its infancy, leave no doubts on the possibilities of applying photochemistry in the confined space of carbon pores in various strategic disciplines such as degradation of pollutants, solar water splitting, or CO2 mitigation. Perhaps the future of photovoltaics and smart‐self‐cleaning or photocorrosion coatings is in exploring the use of nanoporous carbons.

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Section: Foreseen Applicationsmentioning

confidence: 99%

Section: Foreseen Applicationsmentioning

confidence: 99%

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Bandosz

Ania

2018

Advanced Science

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“…Modification of the bandgap and fabrication of large-scale defect-free films are important to achieve TMDC-based solar cell devices with decent efficiency. Recently reported heterojunction solar cells based on TMDC/graphene [163], TMDC/Si [164,165], TMDC/InP [166,167], graphene/Si [168,169] have shown excellent photovoltaic effect and power conversion efficiencies in the visible to infrared region. Solid-phase CVD is commonly used in the fabrication of these 2D semiconductor solar cells.…”

Section: Solar Cellmentioning

confidence: 99%

Progress on Crystal Growth of Two-Dimensional Semiconductors for Optoelectronic Applications

Sun¹,

Xu²,

Zhang³

et al. 2018

Crystals

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Two-dimensional (2D) semiconductors are thought to belong to the most promising candidates for future nanoelectronic applications, due to their unique advantages and capability in continuing the downscaling of complementary metal-oxide-semiconductor (CMOS) devices while retaining decent mobility. Recently, optoelectronic devices based on novel synthetic 2D semiconductors have been reported, exhibiting comparable performance to the traditional solid-state devices. This review briefly describes the development of the growth of 2D crystals for applications in optoelectronics, including photodetectors, light-emitting diodes (LEDs), and solar cells. Such atomically thin materials with promising optoelectronic properties are very attractive for future advanced transparent optoelectronics as well as flexible and wearable/portable electronic devices.

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“…Also, doping the graphene layer has shown to enhance the performance of graphene−silicon solar cells. 11 We can also expect that further increasing V G will increase the barrier height and further enhance the performance of the cell.…”

mentioning

confidence: 98%

Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell Using the Electric Field-Effect

Vazquez‐Mena

Bosco²,

Ergen

et al. 2014

Nano Lett.

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ABSTRACT:The optical transparency and high electron mobility of graphene make it an attractive material for photovoltaics. We present a field-effect solar cell using graphene to form a tunable junction barrier with an Earth-abundant and low cost zinc phosphide (Zn 3 P 2 ) thin-film light absorber. Adding a semitransparent top electrostatic gate allows for tuning of the graphene Fermi level and hence the energy barrier at the graphene-Zn 3 P 2 junction, going from an ohmic contact at negative gate voltages to a rectifying barrier at positive gate voltages. We perform current and capacitance measurements at different gate voltages in order to demonstrate the control of the energy barrier and depletion width in the zinc phosphide. Our photovoltaic measurements show that the efficiency conversion is increased 2-fold when we increase the gate voltage and the junction barrier to maximize the photovoltaic response. At an optimal gate voltage of +2 V, we obtain an open-circuit voltage of V oc = 0.53 V and an efficiency of 1.9% under AM 1.5 1-sun solar illumination. This work demonstrates that the field effect can be used to modulate and optimize the response of photovoltaic devices incorporating graphene. KEYWORDS: Graphene, zinc phosphide, field effect solar cell, Schottky barrier, earth-abundant materials, photovoltaics T he extraordinary properties of graphene, such as its high carrier mobility, Fermi-level tuning and its high optical transparency, make it an attractive candidate to improve the performance of optoelectronic and photovoltaic devices. 1−3 These properties can be exploited for tackling some of the major challenges in solar energy. One challenge is to exploit Earth-abundant and low-cost synthesis materials with band gaps suitable for solar energy conversion. Besides common PV absorbers like Si, CdTe, and CIGS, there are other materials that have the potential for large scale solar implementation at lower costs, such as zinc phosphide (Zn 3 P 2 ), copper zinc tin sulfide (CZTS), cuprous oxide (Cu 2 O), and iron sulfide (FeS 2 ). 4 However, the lack of doping processes necessary to form homojuntions and the absence of complementary emitter materials to form high quality p−n heterojunction have limited the conversion efficiency of devices incorporating these materials. These limitations can be addressed using graphene, which has previously been used to form graphene−semiconductor junctions 5 and solar cells with CdS and CdSe 6,7 semiconductors as well as with Si,5,[8][9][10][11] demonstrating Schottky barrier behavior. 5 Further advances on graphene−semiconductor junctions were demonstrated by building gate-controlled devices in order to modify the Schottky barrier height and the electrical transport across the junction. This design has been used to build a graphene−Si transistor (barristor) 12 and a graphene−organic thin film junction transistors. 9,13 Herein, we study the barrier tuning of a graphene−Zn 3 P 2 field-effect solar cell with a semitransparent top-gate electrode and demonstrate that this tunin...

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High Efficiency Graphene Solar Cells by Chemical Doping

Cited by 897 publications

References 24 publications

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Progress on Crystal Growth of Two-Dimensional Semiconductors for Optoelectronic Applications

Performance Enhancement of a Graphene-Zinc Phosphide Solar Cell Using the Electric Field-Effect

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