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Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120.


ABSTRACT: 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.

SUBMITTER: Davis NJ 

PROVIDER: S-EPMC4667436 | biostudies-literature | 2015 Sep

REPOSITORIES: biostudies-literature

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Multiple-exciton generation in lead selenide nanorod solar cells with external quantum efficiencies exceeding 120.

Davis Nathaniel J L K NJ   Böhm Marcus L ML   Tabachnyk Maxim M   Tabachnyk Maxim M   Wisnivesky-Rocca-Rivarola Florencia F   Jellicoe Tom C TC   Ducati Caterina C   Ehrler Bruno B   Greenham Neil C NC  

Nature communications 20150928


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  ...[more]

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