Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms9259
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Funding
- Cambridge Commonwealth European and International Trust
- Cambridge Australian Scholarships
- German National Academic Foundation ('Studienstiftung')
- Gates Cambridge Trust
- EPSRC
- Winton Programme for the Physics of Sustainability
- CNPq [246050/2012-8]
- EU [312483 ESTEEM2]
- EPSRC [EP/M005143/1, EP/G060738/1, EP/G037221/1]
- ERC [259619 PHOTO-EM]
- EPSRC [EP/G060738/1, EP/M507301/1, EP/M005143/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M507301/1, 1362124, EP/G060738/1, EP/M005143/1] Funding Source: researchfish
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Multiple-exciton generation-a process in which multiple charge-carrier pairs are generated from a single optical excitation-is a promising way to improve the photocurrent in photovoltaic devices and offers the potential to break the Shockley-Queisser limit. One-dimensional nanostructures, for example nanorods, have been shown spectroscopically to display increased multiple exciton generation efficiencies compared with their zero-dimensional analogues. Here we present solar cells fabricated from PbSe nanorods of three different bandgaps. All three devices showed external quantum efficiencies exceeding 100% and we report a maximum external quantum efficiency of 122% for cells consisting of the smallest bandgap nanorods. We estimate internal quantum efficiencies to exceed 150% at relatively low energies compared with other multiple exciton generation systems, and this demonstrates the potential for substantial improvements in device performance due to multiple exciton generation.
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