Increasing Efficiency with Multiple Exciton Generation

McElroy, N.; Çadırcı, Musa; Al-Otaify, Ali; Page, Robert; Binks, David J.

doi:10.1007/978-1-4614-8148-5_9

Cited by 3 publications

(3 citation statements)

References 56 publications

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“…, Δ xx < 0, reduces hv th by Δ xx [ 25 ]. The Detailed Balance model has been used to calculate the potential to solar cell efficiency of this reduction in hv th ; for Δ xx = −0.1 eV, the maximum photovoltaic efficiency increases to as much as 50% [ 82 ]. However, current experimental investigations have so far found Δ xx to be repulsive in Type II QDs [ 83 ], i.e.…”

Section: Future Directionsmentioning

confidence: 99%

Multiple Exciton Generation in Colloidal Nanocrystals

Smith

Binks

2013

Nanomaterials

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In a conventional solar cell, the energy of an absorbed photon in excess of the band gap is rapidly lost as heat, and this is one of the main reasons that the theoretical efficiency is limited to ~33%. However, an alternative process, multiple exciton generation (MEG), can occur in colloidal quantum dots. Here, some or all of the excess energy is instead used to promote one or more additional electrons to the conduction band, potentially increasing the photocurrent of a solar cell and thereby its output efficiency. This review will describe the development of this field over the decade since the first experimental demonstration of multiple exciton generation, including the controversies over experimental artefacts, comparison with similar effects in bulk materials, and the underlying mechanisms. We will also describe the current state-of-the-art and outline promising directions for further development.

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Section: Future Directionsmentioning

confidence: 99%

Multiple Exciton Generation in Colloidal Nanocrystals

Smith

Binks

2013

Nanomaterials

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“…However, the authors also recognized that biexciton binding in type-I colloidal QDs was too weak, at B XX ∼ −10 meV, to have a significant effect. The potential enhancement to solar cell output produced by the combination of efficient MEG and strong biexciton binding was analyzed by McElroy et al [32]. This study was based on the detailed balance model and included the effect of MEG by the stepwise increase in QY used previously.…”

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confidence: 99%

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

Tomić

Miloszewski

Tyrrell

et al. 2016

IEEE J. Photovoltaics

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Semiconductor quantum dots (QDs) are the subject of intensive research worldwide due to a number of novel properties, which make them of interest for both fundamental science and technological applications. QDs are of particular interest for solar cell applications due to their ability to increase efficiency via the generation of multiexcitons from a single photon. The efficiency of multiexciton generation (MEG) in colloidal QDs is determined by the competition between MEG and other hot electron-cooling processes. Core/shell QDs with type-II band alignment offers extra degrees of freedom in mediating both the optical dipoles and the Coulomb interaction between charges in such structures for the benefit of elevated MEG efficiency.

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“…Furthermore, an optimal combination of bulk carrier concentration, diffusion length scales and the presence of different transport mechanisms prevalent in such structures could allow them to be used as single-pixel color sensing elements [ 14 , 17 ]. Organic photovoltaics [ 16 , 73 ] have a high biocompatibility potential, but light-current conversion is still low and 47% of energy turns into heat [ 76 ]. At a high density of pixels, it can lead to the destruction of organic tissue and becomes inoperable.…”

Section: Discussionmentioning

confidence: 99%

Human Eye Optics within a Non-Euclidian Geometrical Approach and Some Implications in Vision Prosthetics Design

et al. 2021

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An analogy with our previously published theory on the ionospheric auroral gyroscope provides a new perspective in human eye optics. Based on cone cells’ real distribution, we model the human eye macula as a pseudospherical surface. This allows the rigorous description of the photoreceptor cell densities in the parafoveal zones modeled further by an optimized paving method. The hexagonal photoreceptors’ distribution has been optimally projected on the elliptical pseudosphere, thus designing a prosthetic array counting almost 7000 pixel points. Thanks to the high morphological similarities to a normal human retina, the visual prosthesis performance in camera-free systems might be significantly improved.

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Increasing Efficiency with Multiple Exciton Generation

Cited by 3 publications

References 56 publications

Multiple Exciton Generation in Colloidal Nanocrystals

Multiple Exciton Generation in Colloidal Nanocrystals

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

Human Eye Optics within a Non-Euclidian Geometrical Approach and Some Implications in Vision Prosthetics Design

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