Optimization schemes for efficient multiple exciton generation and extraction in colloidal quantum dots

Fikeraddis A. Damtie; Khadga J. Karki; Tõnu Pullerits; Andreas Wacker

doi:10.1063/1.4960507

Optimization schemes for efficient multiple exciton generation and extraction in colloidal quantum dots

Fikeraddis A. Damtie, Khadga J. Karki, Tõnu Pullerits, Andreas Wacker

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Multiple exciton generation (MEG) is a process in which more than one electron hole pair is generated per absorbed photon. It allows us to increase the efficiency of solar energy harvesting. Experimental studies have shown the multiple exciton generation yield of 1.2 in isolated colloidal quantum dots. However real photoelectric devices require the extraction of electron hole pairs to electric contacts. We provide a systematic study of the corresponding quantum coherent processes including extraction and injection and show that a proper design of extraction and injection rates enhances the yield significantly up to values around 1.6.

Original language	English
Article number	064703
Journal	Journal of Chemical Physics
Volume	145
Issue number	6
DOIs	https://doi.org/10.1063/1.4960507
State	Published - 14 Aug 2016
Externally published	Yes

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abstract = "Multiple exciton generation (MEG) is a process in which more than one electron hole pair is generated per absorbed photon. It allows us to increase the efficiency of solar energy harvesting. Experimental studies have shown the multiple exciton generation yield of 1.2 in isolated colloidal quantum dots. However real photoelectric devices require the extraction of electron hole pairs to electric contacts. We provide a systematic study of the corresponding quantum coherent processes including extraction and injection and show that a proper design of extraction and injection rates enhances the yield significantly up to values around 1.6.",

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AB - Multiple exciton generation (MEG) is a process in which more than one electron hole pair is generated per absorbed photon. It allows us to increase the efficiency of solar energy harvesting. Experimental studies have shown the multiple exciton generation yield of 1.2 in isolated colloidal quantum dots. However real photoelectric devices require the extraction of electron hole pairs to electric contacts. We provide a systematic study of the corresponding quantum coherent processes including extraction and injection and show that a proper design of extraction and injection rates enhances the yield significantly up to values around 1.6.

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Optimization schemes for efficient multiple exciton generation and extraction in colloidal quantum dots

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