Nanowire CdS-CdTe Solar Cells with Molybdenum Oxide as Contact

Dang, Hongmei; Singh, Vijay Pratap

doi:10.1038/srep14859

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…This material system, particularly in the form of thin and ultra-thin films, finds applications in a variety of technologically relevant fields, including catalysis, 1 gas sensors, 2,3 optically switchable coatings, 4,5 high-energy density solid-state microbatteries, 6,7 smart windows technology, 8,9 flexible supercapacitors, 10 thin film transistors (TFTs) 11 and organic electronics. [12][13][14][15][16][17][18][19][20][21][22] Owing to its high work function -up to 6.9 eV [12] and to the layered structure of α-MoO 3 , MoO x is also employed as a 2D material beyond graphene and as efficient hole contact on 2D transition metal dichalcogenides for p-type field effect transistors (p-FETs). [23][24][25] In view of a reliable device performance, the control over the chemical and physical properties of the MoO x system is mandatory.…”

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confidence: 99%

Processing and charge state engineering of MoOx

et al. 2017

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The effects of wet chemical processing employed in device fabrication standards are studied on molybdenum oxide (MoOx) ultra-thin films. We have combined x-ray photoelectron spectroscopy (XPS), angle resolved XPS and x-ray reflectivity to gain insight into the changes in composition, structure and electronic states upon treatment of films with different initial stoichiometry prepared by reactive sputtering. Our results show significant reduction effects associated with the development of gap states in MoOx, as well as changes in the composition and structure of the films, systematically correlated with the initial oxidation state of Mo.

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confidence: 99%

Processing and charge state engineering of MoOx

et al. 2017

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“…This value was exceeded in coaxial InP NWs with the help of self-aligned nanoparticles which helped in improved absorption, with a reported a PCE value of 17.8% [251]. Similar high performance solar cells have also been reported for CdS [303][304][305], ZnO [306,307], Cu 2 O [306] and more recently, for perovskite nanowires [271]. Research has also begun into tapered NW structures like nanocones [308] and dual-diameter tandem NW solar cells [309].…”

Section: Device Measurementsmentioning

confidence: 76%

Nanostructured photovoltaics

2019

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In this review, we begin by discussing the need for harnessing renewable energy resources in the context of global energy demands. A summary of firstand second-generation solar cells, their efficiency and grid parity is provided, followed by the need to reduce material and installation costs, and achieve higher efficiencies beyond the Shockley-Queisser limit imposed on single junction cells. We also discuss the specific advantages offered by nanomaterials in enhanced energy harvesting, what design platforms comprise nanostructured photovoltaics, and list the prominent categories of nanomaterials used in the design of third generation solar cells. We review the significant nanostructured photovoltaic platforms that have encouraging power conversion efficiencies, have the potential for long term stability (both structural and functional) and have received attention in the field. In addition to their operational principle, we highlight both their advantages and shortcomings, along with insights into possible improvements. We include alternate routes to improving power conversion efficiency, not by tuning material properties to match the solar spectrum but using additives and/or structural modifications to allow more efficient harvesting of sunlight, either by reducing losses or by altering the spectral properties. The properties of nanomaterials that make them well-suited as active materials in photovoltaic devices (broadband absorption, high quantum yield, etc.) also make them ideal candidates for luminescent solar concentrators (LSCs). These devices also harvest solar energy, but instead of directly allowing charge generation, they act as downconverters for other photovoltaic cells. We review dye, thin film, and quantum dot based LSCs that have garnered a lot of attention in recent years as these devices face a resurgence given the advances in materials science and engineering which have led to novel quantum dots and hybrid semiconductors. The review ends with where the future of nanostructured photovoltaics is headed, what device designs and materials development are needed to achieve efficiencies beyond the Shockley-Queisser limits and fulfil the goal of the 3rd and 4th generation photovoltaics.

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“…Nowadays, several methods are being used to get the maximum energy from the solar cells 3 . Dang et al 4 increased the efficiency of the nanowire CdS/CdTe solar cell from 9 to 11% by using a 10 nm thick molybdenum oxide as a transparent layer. On the other hand, single axis and dual axis solar trackers are also used to enhance the solar insolation collection capability by orienting the solar 5 .…”

Section: Introductionmentioning

confidence: 99%

Temperature based maximum power point tracking for photovoltaic modules

Ramos-Hernanz

Uriarte

López-Guede

et al. 2020

Sci Rep

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In this article authors propose a temperature based Maximum Power Point Tracking algorithm (MPPT). Authors show that there is an optimal current vs maximum power curve that depends on photovoltaic (PV) module temperature. Therefore, the maximum power point (MPP) can be achieved in very few commutation steps if the control forces the PV module to work in temperature dependent optimal curve. Authors shows how this PV module temperature based MPPT is stable and converges to MPP for each temperature. In order to proof its stability, authors propose a Lyapunov energy function. This Lyapunov energy function has positive values for all values except into MPP given the PV module temperature. This Lyapunov energy function has negative increment along each time step. Hence, the stability of temperature based MPPT can be demonstrated. The proposed MPPT algorithm proposes a current set point. This current set point is obtained with instantaneous PV module power and temperature dependent maximum power vs optimal current curve. Stability is analysed for different temperature levels. Optimal current vs maximum power curve has been modelled by a line. The lines’ coefficients depend on PV module temperature. Proposed Lyapunov energy function is not symmetric about equilibrium or MPP because MPPT algorithm and PV module dynamic have no symmetric behaviour about this equilibrium point.

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Nanowire CdS-CdTe Solar Cells with Molybdenum Oxide as Contact

Cited by 23 publications

References 21 publications

Processing and charge state engineering of MoOx

Processing and charge state engineering of MoOx

Nanostructured photovoltaics

Temperature based maximum power point tracking for photovoltaic modules

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