Quantum engineering of InAs/GaAs quantum dot based intermediate band solar cells

Neil Scott Beattie, Patrick See, Guillaume Zoppi, Palat Ushasree, Martial Duchamp, Ian Farrer, David A. Ritchie, Stanko Tomic

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)
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Abstract

The efficiency of a solar cell can be substantially increased by opening new energy gaps within the semiconductor band gap. This creates additional optical absorption pathways which can be fully exploited under concentrated sunlight. Here we report a new approach to opening a sizeable energy gap in a single junction GaAs solar cell using an array of InAs quantum dots that leads directly to high device open circuit voltage. High resolution imaging of individual quantum dots provides experimentally obtained dimensions to a quantum mechanical model which can be used to design an optimised quantum dot array. This is then implemented by precisely engineering the shape and size of the quantum dots resulting in a total area (active area) efficiency of 18.3% (19.7%) at 5 suns concentration. The work demonstrates that only the inclusion of an appropriately designed quantum dot array in a solar cell has the potential to result in ultra-high efficiency under concentration.
Original languageEnglish
Pages (from-to)2745-2750
JournalACS Photonics
Volume4
Issue number11
Early online date13 Oct 2017
DOIs
Publication statusE-pub ahead of print - 13 Oct 2017

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