Abstract
Conjugated polymers of diketopyrrolopyrrole (DPP) and thiophene, especially 2,5-di-2-thienyl-thieno[3,2-b]thiophene, were characterized based on their molecular packing orientation, and they showed a π–π stacking distance of 3.6 Å and a high field-effect hole mobility on the order of 10−2 cm2/Vs. Perovskite solar cells fabricated with the genuine or both oxidant- and salt dopant-free polymer as the hole-transporting layer displayed high photoconversion efficiencies of 16.3% as well as high durability.
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Acknowledgements
This work was partially supported by “Research and Development of Innovative Nano Structure Solar Cells” from NEDO, Japan. HM and KS acknowledge the Leading Graduate Program in Science and Engineering, Waseda University from MEXT, Japan.
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Maruo, H., Sasaki, Y., Harada, K. et al. Hole-transporting diketopyrrolopyrrole-thiophene polymers and their additive-free application for a perovskite-type solar cell with an efficiency of 16.3%. Polym J 51, 91–96 (2019). https://doi.org/10.1038/s41428-018-0116-9
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DOI: https://doi.org/10.1038/s41428-018-0116-9
