Morphological Contributions to Interfacial Charge Trapping and Nongeminate Recombination in Polymer Solar Cells Revealed by UV Light Soaking

ACS Applied Materials & Interfaces
Griffin CanningJohn K Grey

Abstract

Nongeminate charge recombination occurs over a broad range of time scales in polymer solar cells and represents a serious loss channel for the performance and lifetime of devices. Multiple factors influence this process, including changes in morphology and formation of permanent defects, but individual contributions are often difficult to resolve from conventional experiments. We use intensity modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) to investigate nongeminate charge recombination in blends of poly[2,6-(4,4-bis-(2-ethylhexyl)-4 H-cyclopenta [2,1- b;3,4- b']dithiophene)- alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) solar cells. PCPDTBT/PCBM devices are exposed to varying doses of UV light resonant with PCBM to induce small perturbations in the thin film morphology, namely local heating. IMPS/IMVS sweeps display signatures unique to degradation, that is, photocurrent and photovoltage leading the excitation light modulation appearing as positive phase shifts or 1st quadrant features in Bode and Nyquist representations, respectively. We assign this component to interface charging at purified PCPDTBT/PCBM phase boundaries that trap mobile charges and facilitate ...Continue Reading

References

Jan 4, 2012·Advanced Materials·Mikkel JørgensenFrederik C Krebs
Jan 17, 2012·Physical Review Letters·M KuikP W M Blom
Mar 1, 2012·Physical Chemistry Chemical Physics : PCCP·Daniele FazziGuglielmo Lanzani
May 23, 2012·Journal of the American Chemical Society·Fabian EtzoldFrédéric Laquai
Dec 12, 2012·Nature Materials·G GranciniG Lanzani
Feb 14, 2015·Chemistry of Materials : a Publication of the American Chemical Society·Jian GaoJohn K Grey
Jan 3, 2013·The Journal of Physical Chemistry Letters·Artem A BakulinRichard H Friend
Dec 24, 2015·ACS Applied Materials & Interfaces·Yongqian GaoJohn K Grey

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Citations

Jan 23, 2021·ACS Applied Materials & Interfaces·Pranab DebJohn K Grey
Dec 20, 2019·ACS Applied Materials & Interfaces·Panagiotis E KeivanidisIain McCulloch

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