Biomimetic light-harvesting funnels for re-directioning of diffuse light

Pieper, Alexander; Hohgardt, Manuel; Willich, Maximilian; Gacek, Daniel A.; Hafi, Nour; Pfennig, Dominik; Albrecht, Andreas; Walla, Peter Jomo

doi:10.1038/s41467-018-03103-4

Cited by 35 publications

(60 citation statements)

References 62 publications

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“…Powering these sensors and other electronic devices in remote and inaccessible places is still an engineering challenge. One attractive proposed solution is energy harvesting devices which could generate electrical power from different sources such as vibration [1][2][3] , wind 4,5 , sound 6,7 , ambient light 8,9 , temperature gradient 10,11 and waves 12,13 . Energy harvesting from the ambient vibration in different environments is an active line of research.…”

Section: Results Of This Study Can Open a New Path To Application Of mentioning

confidence: 99%

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Eghbali

Younesian

Moayedizadeh

et al. 2020

Sci Rep

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Piezoelectric (PZT) components are one of the most popular elements in vibration sensing and also energy harvesting. They are very well established, cost effective and available in different geometries however there are still several challenges in their application particularly in vibration energy harvesting. They are normally narrow-band elements and work in high-frequency range. Their efficiency and power extraction density are also generally low compared with different electromagnetic techniques. Auxetic structures are proposed here to enhance efficiency of the piezoelectric circular patches in vibration energy harvesting. These kinds of patches namely PZT buzzers are inexpensive (less than 10 USD) elements and easily available. Two novel circular auxetic substrates are proposed to improve power extraction capacity of the conventional piezoelectric buzzers. Negative Poison’s ratio of the proposed meta-structure helps in efficiency enhancement. The concept is introduced, analyzed and verified through the finite element modeling and experimental testing. The idea is proved to work by comparing the harvested electrical power in the auxetic design against the conventional plain system. A parametric study is then carried out and effects of important electrical and geometrical parameters as well as the material property on the power extraction efficiency are assessed to arrive at optimum parameters. It is shown that by employing the auxetic design, a remarkable improvement in the harvested power is achievable. It is shown that for the two proposed auxetic designs, at the resonance frequency, we could reach to 10.2 and 13.3 magnification factor with respect to the plain energy harvester. Another important feature is that the resonant frequency in these new designs is very much lower than the conventional resonators. Results of this study can open a new path to application of inexpensive PZT buzzers in large-scale vibration energy harvesting.

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Section: Results Of This Study Can Open a New Path To Application Of mentioning

confidence: 99%

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Eghbali

Younesian

Moayedizadeh

et al. 2020

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Escape cone losses below 10% can easily be achieved. [6][7][8][9][10][11] This funneling light re-direction approach is also much more affordable than the use of dichroic coatings [12] and greatly reduces the number of photons hitting the photoconversion device under unfavorable large angles that usually lead to low conversion efficiencies.…”

Section: F I G U R E 1 Schematic Depiction Of Lsc Concepts a Schemamentioning

confidence: 99%

“…In addition, reabsorption losses are greatly reduced because only small concentrations of the light-redirecting acceptors (red) are necessary. Since acceptors in energy transfer systems generally emit light at lower energies [7,13] its wavelength does not match the absorption spectrum of the higher concentrated donors (green). Even a very small energy (Stokes) shift of the low concentrated acceptors allows a significant reduction of re-absorption losses.…”

Section: F I G U R E 1 Schematic Depiction Of Lsc Concepts a Schemamentioning

confidence: 99%

On the efficiency limits of artificial and ultrafast light‐funnels

et al. 2020

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Many researchers are recently working on artificial light-harvesters that funnel energy onto high-performance photovoltaics. However, similar to the theoretical photovoltaic Shockley-Queisser limit, there are also physical limits in the maximum efficiency of funneling light energy. Unfortunately, they are very complex and depend on many opposing molecular as well as macroscopic structure factors. For example, higher pigment concentrations absorb more sunlight but lead also to higher, intrinsic reabsorption losses. Molecular orientations increasing incoming light absorption can also increase re-emission losses back into the same direction. Larger spectral absorption ranges collect more sunlight but simultaneously increase losses due to lower emission photon energies. Larger macroscopic areas of light-harvesting material decrease the need for expensive photovoltaic materials but also increase molecular re-absorption losses. Larger pools of energy funneling molecules increase light concentration but also increase energy transfer losses. For finding the optimal overall molecular and macroscopic structure these opposing effects need to be varied within physical feasible boundaries. Here, we present a theoretical assessment that include all necessary molecular and macroscopic parameters and that provided optimized light-harvesting structures representing a new efficiency bench mark. For highest efficiencies, our results indicate that combined organic molecule/quantum particle systems share many of the optimum spectroscopic characteristics.

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“…The authors speculated that the APC protein facilitates super ET from QDs to MoSe 2 via a funnel effect, similar to that previously seen in both artificial and man-made lightharvesting systems, and that this effect relates to the perfect alignment of the dipoles of the chromophores constituting the protein with the in-plane dipole of the 2D material. 98,99 Interfacial Charge Transfer in 2D-vDW Hybrids and Heterostructures. Atomically thin 2D-vDW materials can be combined with appropriately chosen semiconducting materials to obtain donor−acceptor hybrids with type I or type II heterojunctions ( Figure 5) where interfacial CT processes can be initiated.…”

Section: Energy Transfer In 2d-vdw Hybrids and Heterostructuresmentioning

confidence: 99%

Light-Induced Interfacial Phenomena in Atomically Thin 2D van der Waals Material Hybrids and Heterojunctions

Chen

Cotlet

2019

ACS Energy Lett.

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Atomically thin 2D van der Waals (2D-vDW) materials have attracted significant attention for optoelectronic applications in photodetectors, photovoltaics, and quantum information science. Their atomically thin thickness, however, renders them poor absorbers. Hybrid structures of 2D-vDW materials assembled with other semiconducting materials, such as quantum dots, nanowires, polymers, other 2D-vDW materials, or 3D bulk materials, have provided an elegant way to increase light harvesting and carrier generation via interfacial charge and energy transfer interactions.Here we present recent examples focused on the characterization of interfacial charge transfer and energy transfer in 2D-vDW hybrids and heterostructures and methods to modulate and control these processes through band gap engineering, morphology engineering, and external factors. Finally, we discuss potential future directions of research, including scalability from micron-sized flake-based devices to wafer size for commercial deployment, issues with long-term stability and performance, and the ability to extend the spectral range of these 2D hybrids.

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Biomimetic light-harvesting funnels for re-directioning of diffuse light

Cited by 35 publications

References 62 publications

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

Study in circular auxetic structures for efficiency enhancement in piezoelectric vibration energy harvesting

On the efficiency limits of artificial and ultrafast light‐funnels

Light-Induced Interfacial Phenomena in Atomically Thin 2D van der Waals Material Hybrids and Heterojunctions

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