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    Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells

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    Type
    Article
    Authors
    Dimitrov, Stoichko D. cc
    Schroeder, Bob C. cc
    Nielsen, Christian
    Bronstein, Hugo cc
    Fei, Zhuping
    McCulloch, Iain cc
    Heeney, Martin
    Durrant, James R. cc
    KAUST Department
    Chemical Science Program
    KAUST Solar Center (KSC)
    Physical Science and Engineering (PSE) Division
    Date
    2016-01-13
    Permanent link to this record
    http://hdl.handle.net/10754/596174
    
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    Abstract
    The lifetime of singlet excitons in conjugated polymer films is a key factor taken into account during organic solar cell device optimization. It determines the singlet exciton diffusion lengths in polymer films and has a direct impact on the photocurrent generation by organic solar cell devices. However, very little is known about the material properties controlling the lifetimes of singlet excitons, with most of our knowledge originating from studies of small organic molecules. Herein, we provide a brief summary of the nature of the excited states in conjugated polymer films and then present an analysis of the singlet exciton lifetimes of 16 semiconducting polymers. The exciton lifetimes of seven of the studied polymers were measured using ultrafast transient absorption spectroscopy and compared to the lifetimes of seven of the most common photoactive polymers found in the literature. A plot of the logarithm of the rate of exciton decay vs. the polymer optical bandgap reveals a medium correlation between lifetime and bandgap, thus suggesting that the Energy Gap Law may be valid for these systems. This therefore suggests that small bandgap polymers can suffer from short exciton lifetimes, which may limit their performance in organic solar cell devices. In addition, the impact of film crystallinity on the exciton lifetime was assessed for a small bandgap diketopyrrolopyrrole co-polymer. It is observed that the increase of polymer film crystallinity leads to reduction in exciton lifetime and optical bandgap again in agreement with the Energy Gap Law.
    Citation
    Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells 2016, 8 (1):14 Polymers
    Publisher
    MDPI AG
    Journal
    Polymers
    DOI
    10.3390/polym8010014
    Additional Links
    http://www.mdpi.com/2073-4360/8/1/14
    ae974a485f413a2113503eed53cd6c53
    10.3390/polym8010014
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Solar Center (KSC)

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