Pyramid‐Textured Antireflective Silicon Surface In Graphene Oxide/Single‐Wall Carbon Nanotube–Silicon Heterojunction Solar Cells

Yu, LePing; Batmunkh, Munkhbayar; Dadkhah, Mahnaz; Shearer, Cameron J.; Shapter, Joseph G.

doi:10.1002/eem2.12020

Cited by 14 publications

(12 citation statements)

References 62 publications

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“…This is comparable to previous literature devices with V oc of <600 mV. [ 9,10,22,45,46 ] Additional performance data for 60 front and 70 back‐junction devices can be found in Figure S7 (Supporting Information), where a high level of reproducibility for the proposed system can be seen. Devices consisting of Nafion alone can be found in Figure S8 (Supporting Information).…”

Section: Resultssupporting

confidence: 88%

“…This surpasses all previous work reporting an EQE value of <70% at 1000 nm. [ 10,45,47 ] The high QE is a result of complete coverage of the textured Si wafer with CNTs and the excellent antireflection properties of Nafion. Using EQE and 1− R data, IQE was calculated and it can be seen that EQE and IQE for the front junction are slightly separated.…”

Section: Resultsmentioning

confidence: 99%

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Front and Back‐Junction Carbon Nanotube‐Silicon Solar Cells with an Industrial Architecture

Chen

Tune

et al. 2020

Adv Funct Materials

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In the past, the application of carbon nanotube-silicon solar cell technology to industry has been limited by the use of a metallic frame to define an active area in the middle of a silicon wafer. Here, industry standard device geometries are fabricated with a front and back-junction design which allow for the entire wafer to be used as the active area. These are enabled by the use of an intermixed Nafion layer which simultaneously acts as a passivation, antireflective, and physical blocking layer as well as a nanotube dopant. This leads to the formation of a hybrid nanotube/Nafion passivated charge selective contact, and solar cells with active areas of 1-16 cm 2 are fabricated. Record maximum power conversion efficiencies of 15.2% and 18.9% are reported for front and back-junction devices for 1 and 3 cm 2 active areas, respectively. By placing the nanotube film on the rear of the device in a back-junction architecture, many of the design-related challenges for carbon nanotube silicon solar cells are addressed and their future applications to industrialized processes are discussed.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Front and Back‐Junction Carbon Nanotube‐Silicon Solar Cells with an Industrial Architecture

Chen

Tune

et al. 2020

Adv Funct Materials

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“…[ 135 ] In hindsight this has developed CNT films to become closer to ITO in its function as a transparent conductive layer than as a hole selective contact. In fact, researchers have been so concerned with the figure of merit that few groups even considered interface passivation, [ 136 ] antireflective coatings [ 137 ] or light management, [ 138 ] device geometry or the use of a back surface in their devices. This is a peculiar observation, especially in light of their well‐established importance in the broader field of silicon photovoltaics.…”

Section: Carbon Nanotubes In Silicon Photovoltaicsmentioning

confidence: 99%

Carbon Nanotubes for Photovoltaics: From Lab to Industry

Wieland

Han

Rust

et al. 2020

Advanced Energy Materials

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All other nanotube conformations (0° < θ < 30°) are referred to as being chiral. In this 1D system, circumferential electron confinement results in SWCNTs that are either metallic (m) or semiconducting (s) and the innate ability of small changes in diameter to impart large changes in the spectral position (size) of absorption maxima (bandgap) of the SWCNTs. [1a,2] For each chiral species these maxima appear as sets of discrete excitonic transitions (S 11 , S 22 , S 33 …etc.) in the infrared, visible, and ultraviolet and the ability to tune them with structure has made SWCNTs one of the most intensively studied nanomaterials of the past two decades. [3] SWCNTs meet all of the requirements for next generation technology to become flexible and potentially made entirely from carbon to aid disposal at the end of the product life-cycle. Applications for SWCNTs can be found across all fields of science including photonics, [4] telecommunications, [5] batteries, [6] fuel cells, [7] high frequency transistors, [8] biosensors, [9] novel memory devices, [10] molecular contacts, [11] and cancer research. [12] In particular, their chirality dependent bandgap, chemical stability, conductivity, and hole selectivity have made them attractive for new generation solar cells and light sensitive elements. [13] For example, there are 200 species in the dia meter range of 0.6-2 nm, which have first (S 11) and second (S 22) optical transitions ranging from 2.57 eV (visible) to 0.5 eV (near-infrared) and these already cover a majority of the solar spectrum (400-2000 nm), Figure 1d. [14] Being solutionprocessable and fiber-shaped, CNTs can easily be integrated into different types of solar cells with distinct functions. For example, as a photoactive layer in organic solar cell, a transparent electrode in silicon and perovskite solar cells or as counter electrode in dye-sensitized solar cells. [15] However, despite their promise, the number of real-world applications for SWCNTs in the photovoltaics (PV) industry continue to remain limited. The reasons for this are manifold and include the comparatively lower power conversion efficiency (PCE) and device area of SWCNT-based technologies, which drive simple cost-benefit arguments to retool existing production lines, ongoing challenges to orientate and control the structure of CNT films in a scalable manner, spurious health concerns associated with the use of CNTs [16] and importantly, the fact that it is still not possible to selectively synthesize SWCNTs of arbitrarily defined chirality. Most synthesis methods produce a 2:1 mixture of many semiconducting and metallic chiral types and even the CoMoCAT synthesis process, [17] which is well known to be highly enriched in small diameter (6,5), still contains at least 15 other chiral species in low concentration. Research efforts to achieve chiral specific growth are ongoing The use of carbon nanotubes (CNTs) in photovoltaics could have significant ramifications on the commercial solar cell market. Three interrelated research directions within t...

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“…Front-side reflectance detracts significantly from the photocurrent production of photovoltaic devices. Random pyramids in the CNT/Si heterojunction design improve the efficiency [21][22][23], as observed in other photovoltaic devices [24], while the use of silicon nanowires has also been investigated by Petterson et al The nanowires dramatically lowered the surface reflectance leading to improved performance [25]. Another approach to reduce the silicon reflectance involved spin coating of a TiO 2 colloid giving a nanoparticulate layer of 50-80 nm in thickness on the surface [26].…”

Section: Introductionmentioning

confidence: 95%

Preparation of Hybrid Molybdenum Disulfide/Single Wall Carbon Nanotube–n-Type Silicon Solar Cells

Almalki

Grace

et al. 2019

Applied Sciences

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Carbon nanotube/silicon (CNT/Si) heterojunction solar cells represent one new architecture for photovoltaic devices. The addition of MoS2 to the devices is shown to increase the efficiency of the devices. Two structures are explored. In one case, the single wall carbon nanotubes (SWCNTs) and MoS2 flakes are mixed to make a hybrid, which is then used to make a film, while in the other case, a two layer system is used with the MoS2 deposited first followed by the SWCNTs. In all cases, the solar cell efficiency is improved largely due to significant increases in the fill factor. The rise in fill factor is due to the semiconducting nature of the MoS2, which helps with the separation of charge carriers.

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Pyramid‐Textured Antireflective Silicon Surface In Graphene Oxide/Single‐Wall Carbon Nanotube–Silicon Heterojunction Solar Cells

Cited by 14 publications

References 62 publications

Front and Back‐Junction Carbon Nanotube‐Silicon Solar Cells with an Industrial Architecture

Front and Back‐Junction Carbon Nanotube‐Silicon Solar Cells with an Industrial Architecture

Carbon Nanotubes for Photovoltaics: From Lab to Industry

Preparation of Hybrid Molybdenum Disulfide/Single Wall Carbon Nanotube–n-Type Silicon Solar Cells

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