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Nanomaterials 2014, 4(1), 19-45; doi:10.3390/nano4010019
Review

Multiple Exciton Generation in Colloidal Nanocrystals

 and *
Received: 20 November 2013; in revised form: 18 December 2013 / Accepted: 18 December 2013 / Published: 24 December 2013
(This article belongs to the Special Issue Nanomaterials in Energy Conversion and Storage)
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Abstract: In a conventional solar cell, the energy of an absorbed photon in excess of the band gap is rapidly lost as heat, and this is one of the main reasons that the theoretical efficiency is limited to ~33%. However, an alternative process, multiple exciton generation (MEG), can occur in colloidal quantum dots. Here, some or all of the excess energy is instead used to promote one or more additional electrons to the conduction band, potentially increasing the photocurrent of a solar cell and thereby its output efficiency. This review will describe the development of this field over the decade since the first experimental demonstration of multiple exciton generation, including the controversies over experimental artefacts, comparison with similar effects in bulk materials, and the underlying mechanisms. We will also describe the current state-of-the-art and outline promising directions for further development.
Keywords: multiple exciton generation; carrier multiplication; nanocrystals; quantum dots; nanoparticles; solar cells; photovoltaic multiple exciton generation; carrier multiplication; nanocrystals; quantum dots; nanoparticles; solar cells; photovoltaic
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Smith, C.; Binks, D. Multiple Exciton Generation in Colloidal Nanocrystals. Nanomaterials 2014, 4, 19-45.

AMA Style

Smith C, Binks D. Multiple Exciton Generation in Colloidal Nanocrystals. Nanomaterials. 2014; 4(1):19-45.

Chicago/Turabian Style

Smith, Charles; Binks, David. 2014. "Multiple Exciton Generation in Colloidal Nanocrystals." Nanomaterials 4, no. 1: 19-45.


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