Charge Generation Dynamics in Efficient All-Polymer Solar Cells: Influence of Polymer Packing and Morphology

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All-polymer solar cells exhibit rapid progress in power conversion efficiency (PCE) from 2 to 7.7% over the past few years. While this improvement is primarily attributed to efficient charge transport and balanced mobility between the carriers, not much is known about the charge generation dynamics in these systems. Here we measured exciton relaxation and charge separation dynamics using ultrafast spectroscopy in polymer/polymer blends with different molecular packing and morphology. These measurements indicate that preferential face-on configuration with intermixed nanomotphology increases the charge generation efficiency. In fact, there is a direct quantitative correlation between the free charge population in the ultrafast time scales and the external quantum efficiency, suggesting not only the transport but also charge generation is key for the design of high performance all polymer solar cells.
Publisher
AMER CHEMICAL SOC
Issue Date
2015-12
Language
English
Article Type
Article
Citation

ACS APPLIED MATERIALS & INTERFACES, v.7, no.50, pp.27586 - 27591

ISSN
1944-8244
DOI
10.1021/acsami.5b08531
URI
http://hdl.handle.net/10203/207822
Appears in Collection
CBE-Journal Papers(저널논문)
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