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. 2016 Jul 14;6:29437. doi: 10.1038/srep29437

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(a) Structure of PCDTBT (left) and PCBM (right). (b) Photocurrent excitation spectrum of the PCDTBT:PCBM solar cell under investigation. (c) Current-voltage response of same cell under AM1.5 G solar illumination (right-axis) and under ultrafast laser illumination (left-axis). The uncertainty in the photocurrent density measured by exciting with the femtosecond pulse train is less than 10%.