Design of Core/Shell Colloidal Quantum Dots for MEG Solar Cells

Tomić, Stanko; Miloszewski, Jacek M.; Tyrrell, Edward J.; Binks, David J.

doi:10.1109/jphotov.2015.2483368

Cited by 16 publications

(7 citation statements)

References 35 publications

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“…In nanomaterials, these relaxation pathways can differ dramatically from those in traditional bulk semiconductors. For example, substantial effort has focused on engineering multiple exciton generation pathways in quantum dots (QDs) to optimize the performance for photovoltaic cells. − Advances in QD device design have led to the experimental realization of an internal quantum efficiency greater than 100% when ℏω ≳ 3 E g , where E g is the band gap of the light-absorbing material. − …”

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confidence: 99%

Extremely Efficient Photocurrent Generation in Carbon Nanotube Photodiodes Enabled by a Strong Axial Electric Field

et al. 2019

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Carbon nanotube (CNT) photodiodes have the potential to convert light into electrical current with high efficiency. However, previous experiments have revealed the photocurrent quantum yield (PCQY) to be well below 100%. In this work, we show that the axial electric field increases the PCQY of CNT photodiodes. Under optimal conditions, our data suggest PCQY > 100%. We studied, both experimentally and theoretically, CNT photodiodes at room temperature using optical excitation corresponding to the S22, S33, and S44 exciton resonances. The axial electric field inside the pn junction was controlled using split gates that are capacitively coupled to the suspended CNT. Our results give new insight into the photocurrent generation pathways in CNTs and the field dependence and diameter dependence of PCQY.

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confidence: 99%

Extremely Efficient Photocurrent Generation in Carbon Nanotube Photodiodes Enabled by a Strong Axial Electric Field

et al. 2019

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“…This allows for greater utilization of highenergy photons and dramatically increases solar cell efficiency. The MEG process competes with other radiative and nonradiative recombination and relaxation processes, most of all with Auger cooling [130][131][132].…”

Section: Multi Exciton Generation Solar Cellsmentioning

confidence: 99%

Multiscale in modelling and validation for solar photovoltaics

et al. 2018

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Photovoltaics is amongst the most important technologies for renewable energy sources, and plays a key role in the development of a society with a smaller environmental footprint. Key parameters for solar cells are their energy conversion efficiency, their operating lifetime, and the cost of the energy obtained from a photovoltaic system compared to other sources. The optimization of these aspects involves the exploitation of new materials and development of novel solar cell concepts and designs. Both theoretical modeling and characterization of such devices require a comprehensive view including all scales from the atomic to the macroscopic and industrial scale. The different length scales of the electronic and optical degrees of freedoms specifically lead to an intrinsic need for multiscale simulation, which is accentuated in many advanced photovoltaics concepts including nanostructured regions. Therefore, multiscale modeling has found particular interest in the photovoltaics community, as a tool to advance the field beyond its current limits. In this article, we review the field of multiscale techniques applied to photovoltaics, and we discuss opportunities and remaining challenges.

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“…This limit has become a strong motivation for scientists working on the development of solar cells, and so this model is very important in the history of solar-based energy studies. Although the model was reported in 1961 by Shockley and Queisser [9] for single p-n junction solar cells, it is also used extensively to calculate the efficiency values of QDNC solar cells [11,12]. This model, fundamentally established depending on the band gap ( E g ) variation, has been modified [13] in a different manner to calculate the efficiency of new generation QDNC solar cells [14].…”

Section: Introductionmentioning

confidence: 99%

“…As is well known, the detailed balance model assumes that all photons coming from the sun with energies equal to or greater than E g are absorbed and form electron-hole pairs (excitons). In this idealized model, the sole loss mechanism is the radiative recombinations of the excitons [9,12]. Since the model is based on E g only, the efficiency of any photovoltaic device is equal to that of another one with the same E g .…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, according to the original detailed balance model, the efficiency of solar cells with type-I QDNC is identical to the efficiency of solar cells with type-II QDNC if their E g values are the same [16,17]. A number of theoretical studies have been reported in the literature related to the conversion efficiency of QDNC-based solar cells, and the calculations have been performed in the framework of the original detailed balance model in all these studies [11,12,[16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the shell material and confinement type on the conversion efficiency of core/shell quantum dot nanocrystal solar cells

Şahin

2018

J. Phys.: Condens. Matter

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In this study, the effects of the shell material and confinement type on the conversion efficiency of core/shell quantum dot nanocrystal (QDNC) solar cells have been investigated in detail. For this purpose, the conventional, i.e. original, detailed balance model, developed by Shockley and Queisser to calculate an upper limit for the conversion efficiency of silicon p-n junction solar cells, is modified in a simple and effective way to calculate the conversion efficiency of core/shell QDNC solar cells. Since the existing model relies on the gap energy ([Formula: see text]) of the solar cell, it does not make an estimation about the effect of QDNC materials on the efficiency of the solar cells, and gives the same efficiency values for several QDNC solar cells with the same [Formula: see text]. The proposed modification, however, estimates a conversion efficiency in relation to the material properties and also the confinement type of the QDNCs. The results of the modified model show that, in contrast to the original one, the conversion efficiencies of different QDNC solar cells, even if they have the same [Formula: see text], become different depending upon the confinement type and shell material of the core/shell QDNCs, and this is crucial in the design and fabrication of the new generation solar cells to predict the confinement type and also appropriate QDNC materials for better efficiency.

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Design of Core/Shell Colloidal Quantum Dots for MEG Solar Cells

Cited by 16 publications

References 35 publications

Extremely Efficient Photocurrent Generation in Carbon Nanotube Photodiodes Enabled by a Strong Axial Electric Field

Extremely Efficient Photocurrent Generation in Carbon Nanotube Photodiodes Enabled by a Strong Axial Electric Field

Multiscale in modelling and validation for solar photovoltaics

Effect of the shell material and confinement type on the conversion efficiency of core/shell quantum dot nanocrystal solar cells

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