High-performance Fullerene-free Polymer Solar Cells with Solution-processed Conjugated Polymers as Anode Interfacial Layer

A series of conjugated polymers based on PFS derivatives with n-conjugated 5-（9H-fluoren-2-yl）-2,2＇-bithiophene （fluorene-alt-bithiophene） backbones, namely PFS-3C, PFS-4C and PFS-6C, were synthesized for their use as the anode interfacial layers （AILs） in the efficient fullerene-free polymer solar...

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Bibliographic Details
Published in:Chinese journal of polymer science 2017-02, Vol.35 (2), p.219-229
Main Authors: Zhang, Kai, Liu, Xiao-yu, Xu, Bo-wei, Cui, Yong, Sun, Ming-liang, Hou, Jian-hui
Format: Article
Language:English
Subjects:
Absorption spectra
Chains (polymeric)
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Energy conversion efficiency
Energy levels
Fullerenes
Industrial Chemistry/Chemical Engineering
Optoelectronic devices
Photovoltaic cells
Polymer Sciences
Polymers
Solar cells
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Summary:A series of conjugated polymers based on PFS derivatives with n-conjugated 5-（9H-fluoren-2-yl）-2,2＇-bithiophene （fluorene-alt-bithiophene） backbones, namely PFS-3C, PFS-4C and PFS-6C, were synthesized for their use as the anode interfacial layers （AILs） in the efficient fullerene-free polymer solar ceils （PSCs）. Alkyl sulfonate pendants with different lengths of alkyl side chains were introduced in the three polymers in order to investigate the effect of the alkyl chain length on the anode modification. The obtained three polymers exhibited similar absorption bands and energy levels, indicating that changing the length of the alkyl side chains did not affect the optoelectronic properties of the conjugated polymers. Based on the PBDB-T：ITIC active layer, we fabricated the fullerene-free PSCs using the three polymers as the AILs. The superior performance of the fullerene-free PSC device was achieved when PFS-4C was used as the AIL, showing a power conversion efficiency （PCE） of 10.54%. The high performance of the PFS-4C-modified device could be ascribed to the high transmittance, suitable work-function （WF） and smooth surface of PFS-4C. To the best of our knowledge, the PCE obtained in the PFS-4C-modified device is among the highest PCE values in the fullerene-free PSCs at present. These results demonstrate that the PFS derivatives are promising candidates in serving as the AIL materials for high-performance fullerene-free PSCs.
ISSN:0256-7679
1439-6203
DOI:10.1007/s10118-017-1888-7