2015-09-28
Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120%
Publication
Publication
Nature Commun. , Volume 6 - Issue Article number: 8259 p. 1- 7
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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| NPG | |
| doi.org/10.1038/ncomms9259 | |
| Nature Commun. | |
| LMPV | |
| Organisation | Hybrid Solar Cells |
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Davis, N. J. L. K., Böhm, M., Tabachnyk, M., Wisnivesky, F., Jellicoe, T. C., Ducati, C., … Greenham, N. (2015). Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120%. Nature Commun., 6(Article number: 8259), 1–7. doi:10.1038/ncomms9259 |
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