Graphene films as transparent electrodes for photovoltaic devices based on cadmium sulfide thin films

Gautam, Madhav; Shi, Zhengqi; Jayatissa, Ahalapitiya H.

doi:10.1016/j.solmat.2017.01.002

Cited by 44 publications

(22 citation statements)

References 56 publications

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“…CVD is a favorable approach to realize high‐quality, large‐scale, and continuous graphene films by growing graphene on various substrates (Ni, Cu, Pt, Ru, or Ir) . The sheet resistance of CVD grown graphene is a few hundred Ohms per square, and its light absorption loss is almost as low as the ideal value (2.3% per layer).…”

Section: Graphenementioning

confidence: 99%

Graphene‐Based Transparent Conductive Films: Material Systems, Preparation and Applications

2018

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The rising demands of optoelectronic devices, such as flexibility, stretchability, and energy efficiency, urgently require alternative transparent conductive films (TCFs) for indium tin oxide. Among all the candidates such as carbon nanomaterials, metal nanomaterials, conductive polymers, and other nanocomposites, graphene is highly promising because of its distinct properties, such as outstanding conductivity, impressive optical transparency, remarkable mechanical flexibility, and chemical/thermal stability. However, the practical application of graphene‐based TCFs (G‐TCFs) is still challenging due to the difficulty for preparing large‐area crystalline graphene with few defects for TCFs. Many efforts have been made to solve these problems, and several kinds of optoelectronic devices have been successfully fabricated with G‐TCFs. This review presents the recent development in this area made by the authors and others, including the material systems and synthetic strategies of G‐TCFs, as well as their applications as transparent electrodes in optoelectronic devices such as field effect transistors, organic light‐emitting diodes, organic solar cells, and other devices. The current major challenges in this area and the potential practical solutions are identified.

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Section: Graphenementioning

confidence: 99%

Graphene‐Based Transparent Conductive Films: Material Systems, Preparation and Applications

2018

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“…This fact was also supported by the emergence of the 2D peak at ~2700 cm −1 , whose intensity and shape were not only correlated with the number of defects but also with the number of layers of the graphene-based structure [26]. In this case, the intensity and the full width at half maximum of the 2D band relative to the G band indicated that the LrGO obtained was comparable to the few-layered graphene obtained by chemical vapor deposition (CVD) [27].…”

Section: Resultsmentioning

confidence: 99%

Inexpensive Graphene Oxide Heaters Lithographed by Laser

et al. 2019

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In this paper, we present a simple and inexpensive method for the fabrication of high-performance graphene-based heaters on different large-scale substrates through the laser photothermal reduction of graphene oxide (laser-reduced graphene-oxide, LrGO). This method allows an efficient and localized high level of reduction and therefore a good electrical conductivity of the treated films. The performance of the heaters is studied in terms of steady-state temperature, power consumption, and time response for different substrates and sizes. The results show that the LrGO heaters can achieve stable steady-state temperatures higher than 200 °C when a voltage of 15 V is applied, featuring a time constant of around 4 s and a heat transfer coefficient of ~200 °C cm2/W. These characteristics are compared with other technologies in this field, demonstrating that the fabrication approach described in this work is competitive and promising to fabricate large-scale flexible heaters with a very fast response and high steady-state temperatures in a cost-effective way. This technology can be easily combined with other fabrication methods, such as screen printing or spray-deposition, for the manufacturing of complete sensing systems where the temperature control is required to adjust functionalities or to tune sensitivity or selectivity.

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“…However due to its high-temperature processing, brittle nature, increasing cost due to the scarcity of indium and disadvantages in the terms of production [12,13], a continuous effort is being done in order to find suitable indium-free alternatives to ITO. Metallic nanowire networks, carbon nanotubes, conductive polymers, graphene, and ultra-thin metallic films [14][15][16][17][18] are some of the alternatives to potentially reduce the production cost in the photovoltaic (PV) industry. Recently, dielectric-metal-dielectric (DMD) structures have emerged as valid candidates to substitute the ITO electrode in silicon solar cells.…”

Section: Introductionmentioning

confidence: 99%

Influence of Co-Sputtered Ag:Al Ultra-Thin Layers in Transparent V2O5/Ag:Al/AZO Hole-Selective Electrodes for Silicon Solar Cells

et al. 2020

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As optoelectronic devices continue to improve, control over film thickness has become crucial, especially in applications that require ultra-thin films. A variety of undesired effects may arise depending on the specific growth mechanism of each material, for instance a percolation threshold thickness is present in Volmer-Webber growth of materials such as silver. In this paper, we explore the introduction of aluminum in silver films as a mechanism to grow ultrathin metallic films of high transparency and low sheet resistance, suitable for many optoelectronic applications. Furthermore, we implemented such ultra-thin metallic films in Dielectric/Metal/Dielectric (DMD) structures based on Aluminum-doped Zinc Oxide (AZO) as the dielectric with an ultra-thin silver aluminum (Ag:Al) metallic interlayer. The multilayer structures were deposited by magnetron sputtering, which offers an industrial advantage and superior reliability over thermally evaporated DMDs. Finally, we tested the optimized DMD structures as a front contact for n-type silicon solar cells by introducing a hole-selective vanadium pentoxide (V2O5) dielectric layer.

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Graphene films as transparent electrodes for photovoltaic devices based on cadmium sulfide thin films

Cited by 44 publications

References 56 publications

Graphene‐Based Transparent Conductive Films: Material Systems, Preparation and Applications

Graphene‐Based Transparent Conductive Films: Material Systems, Preparation and Applications

Inexpensive Graphene Oxide Heaters Lithographed by Laser

Influence of Co-Sputtered Ag:Al Ultra-Thin Layers in Transparent V2O5/Ag:Al/AZO Hole-Selective Electrodes for Silicon Solar Cells

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