| 1. |
- Adham, Kristi, et al.
(författare)
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Growth of branched nanowires via solution-based Au seed particle deposition
- 2023
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Ingår i: Materials Research Express. - 2053-1591. ; 10:8
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Tidskriftsartikel (refereegranskat)abstract
- Nanowires offer unprecedented flexibility as nanoscale building blocks for future optoelectronic devices, especially with respect to nanowire solar cells and light-emitting diodes. A relatively new concept is that of charge carrier diffusion-induced light-emitting diodes, for which nanowires offer an interesting architecture by use of particle-assisted core-branch growth. The branches should be homogenously distributed along the cores. However, most deposition techniques, such as aerosol particle deposition, mainly yield particles at the nanowire tips for dense nanowire arrays. In this study, we demonstrate a liquid-based approach for homogeneously distributed formation of catalytic Au particles on the core nanowire sidewalls which is cost and time-efficient. Subsequently, we demonstrate the synthesis of dispersed nanowire branches. We show that by changing the deposition parameters, we can tune the number of branches, their dimensions, and their growth direction.
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| 2. |
- Barrigon, Enrique, et al.
(författare)
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Nanoprobe-Enabled Electron Beam Induced Current Measurements on III-V Nanowire-Based Solar Cells
- 2019
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Ingår i: 2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019. - 0160-8371. - 9781728104942 ; , s. 2730-2733
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Konferensbidrag (refereegranskat)abstract
- Electron beam induced current (EBIC) is a well-established tool to, among others, locate and analyze p-n junctions, Schottky contacts or heterostructures in planar devices and is now becoming essential to study and optimize devices at the nanoscale, like III-V nanowire (NW) based solar cells. Here, we report on EBIC measurements on III-V single NW solar cells as well as on fully processed NW devices. This paper also highlights the importance of EBIC to optimize short circuit current density values of fully processed nanowire solar cells of 1 mm2.
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| 3. |
- Espinet-Gonzalez, Pilar, et al.
(författare)
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Nanowire Solar Cells : A New Radiation Hard PV Technology for Space Applications
- 2020
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Ingår i: IEEE Journal of Photovoltaics. - 2156-3381. ; 10:2, s. 502-507
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Tidskriftsartikel (refereegranskat)abstract
- Radiation hard thin-film solar cell technologies are necessary in order to achieve a step forward in the specific power of solar arrays for space applications. In this article, we analyze the degradation of nanowire (NW) solar cells under high energy particles. GaAs NW solar cells have been irradiated with protons of 100 and 350 keV at different fluences. The radiation hardness of the NW solar cells in all the cases is remarkable in comparison with GaAs planar solar cells and prior literature. Design guidelines to optimize the specific power of NW solar cells for space applications by jointly increasing their efficiency and radiation hardness are presented.
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| 4. |
- Winge, David O., et al.
(författare)
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Optoelectronic III-V nanowire implementation of a neural network in a shared waveguide
- 2020
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Ingår i: 2020 International Conference on Numerical Simulation of Optoelectronic Devices, NUSOD 2020. - 2158-3234. - 9781728160863 ; 2020-September, s. 99-100
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Konferensbidrag (refereegranskat)abstract
- Neural node components consisting of III-V nanowire devices are introduced. This allows for the construction of a small footprint specialized neural network. A broadcasting strategy is developed which removes the need for inter-node wiring. As a model system, an insect brain navigational circuit is chosen and successfully emulated using the introduced nodes and network architecture. The results are based on electronic transport simulations in each device as well as finite-difference time-domain simulations for the broadcasting of optical signals.
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| 5. |
- Zehender, Marius H., et al.
(författare)
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Design study of a nanowire three-terminal heterojunction bipolar transistor solar cell
- 2021
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Ingår i: 48th IEEE Photovoltaic Specialists Conference, PVSC 2021. - 0160-8371. - 9781665419222 ; , s. 1254-1257
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Konferensbidrag (refereegranskat)abstract
- We present an optical design study on a nanowire heterojunction bipolar transistor solar cell. The simple structure of this novel architecture of double-junction solar cell, allows for independent power extraction from the two junctions and makes the nanowire growth easier than in current-matched double-junction solar cells as there is no need for tunnel junctions and only three main semiconductor regions must be grown. We show that the nanowire heterojunction bipolar transistor solar cell design results in an optical performance similar to comparable planar devices, with the nanowires only covering 1/3 of the substrate area. Furthermore, it allows for the growth of lattice-mismatched semiconductor combinations, which increases the detailed balance efficiency limit.
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| 6. |
- Zhang, Yuwei, et al.
(författare)
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UV exposure : A novel processing method to fabricate nanowire solar cells
- 2019
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Ingår i: 2019 IEEE 46th Photovoltaic Specialists Conference, PVSC 2019. - 0160-8371. - 9781728104942 ; , s. 2646-2648
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Konferensbidrag (refereegranskat)abstract
- We demonstrate a novel and rapid method for nanowire (NW) solar cell processing. NW arrays were embedded in photoresist. The strong absorption of light in the NWs leads to self-limited exposure of the resist, which enables selective removal of the exposed part of the resist, opening up for the tips of the NWs and further processing. The UV-exposure technology allows a fast and low-cost process compared to the conventional reactive ion etching method.
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