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Determining the optimum morphology in high-performance polymer-fullerene organic photovoltaic cells.


ABSTRACT: The morphology of bulk heterojunction organic photovoltaic cells controls many of the performance characteristics of devices. However, measuring this morphology is challenging because of the small length-scales and low contrast between organic materials. Here we use nanoscale photocurrent mapping, ultrafast fluorescence and exciton diffusion to observe the detailed morphology of a high-performance blend of PTB7:PC71BM. We show that optimized blends consist of elongated fullerene-rich and polymer-rich fibre-like domains, which are 10-50 nm wide and 200-400 nm long. These elongated domains provide a concentration gradient for directional charge diffusion that helps in the extraction of charge pairs with 80% efficiency. In contrast, blends with agglomerated fullerene domains show a much lower efficiency of charge extraction of ~45%, which is attributed to poor electron and hole transport. Our results show that the formation of narrow and elongated domains is desirable for efficient bulk heterojunction solar cells.

SUBMITTER: Hedley GJ 

PROVIDER: S-EPMC3905772 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature

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Determining the optimum morphology in high-performance polymer-fullerene organic photovoltaic cells.

Hedley Gordon J GJ   Ward Alexander J AJ   Alekseev Alexander A   Howells Calvyn T CT   Martins Emiliano R ER   Serrano Luis A LA   Cooke Graeme G   Ruseckas Arvydas A   Samuel Ifor D W ID  

Nature communications 20130101


The morphology of bulk heterojunction organic photovoltaic cells controls many of the performance characteristics of devices. However, measuring this morphology is challenging because of the small length-scales and low contrast between organic materials. Here we use nanoscale photocurrent mapping, ultrafast fluorescence and exciton diffusion to observe the detailed morphology of a high-performance blend of PTB7:PC71BM. We show that optimized blends consist of elongated fullerene-rich and polymer  ...[more]

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