ORCID Profile
0000-0002-0060-9495
Current Organisation
Imperial College London
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Publisher: IEEE
Date: 06-2014
Publisher: Wiley
Date: 24-03-2016
DOI: 10.1002/PIP.2769
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2016
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2014
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4822196
Publisher: AIP Publishing
Date: 25-08-2014
DOI: 10.1063/1.4894424
Abstract: Quantum wires (QWRs) form naturally when growing strain balanced InGaAs/GaAsP multi-quantum wells (MQW) on GaAs [100] 6° misoriented substrates under the usual growth conditions. The presence of wires instead of wells could have several unexpected consequences for the performance of the MQW solar cells, both positive and negative, that need to be assessed to achieve high conversion efficiencies. In this letter, we study QWR properties from the point of view of their performance as solar cells by means of transmission electron microscopy, time resolved photoluminescence and external quantum efficiency (EQE) using polarised light. We find that these QWRs have longer lifetimes than nominally identical QWs grown on exact [100] GaAs substrates, of up to 1 μs, at any level of illumination. We attribute this effect to an asymmetric carrier escape from the nanostructures leading to a strong 1D-photo-charging, keeping electrons confined along the wire and holes in the barriers. In principle, these extended lifetimes could be exploited to enhance carrier collection and reduce dark current losses. Light absorption by these QWRs is 1.6 times weaker than QWs, as revealed by EQE measurements, which emphasises the need for more layers of nanostructures or the use light trapping techniques. Contrary to what we expected, QWR show very low absorption anisotropy, only 3.5%, which was the main drawback a priori of this nanostructure. We attribute this to a reduced lateral confinement inside the wires. These results encourage further study and optimization of QWRs for high efficiency solar cells.
Publisher: Elsevier BV
Date: 09-2019
Publisher: Wiley
Date: 20-01-2015
DOI: 10.1002/PIP.2585
Publisher: River Publishers
Date: 2016
Publisher: Elsevier BV
Date: 03-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2014
Publisher: Wiley
Date: 25-01-2015
DOI: 10.1002/PIP.2462
Publisher: Elsevier BV
Date: 10-2019
Publisher: Springer Science and Business Media LLC
Date: 19-06-2017
DOI: 10.1557/ADV.2017.448
Publisher: IOP Publishing
Date: 22-06-2015
Publisher: Springer Science and Business Media LLC
Date: 12-04-2018
Publisher: SPIE
Date: 14-03-2016
DOI: 10.1117/12.2217590
Publisher: IOP Publishing
Date: 04-07-2017
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 10-2017
Publisher: IOP Publishing
Date: 2017
Publisher: IEEE
Date: 06-2016
Publisher: Elsevier BV
Date: 02-2018
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: No location found
No related grants have been discovered for Diego Alonso Álvarez.