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An oligothiophene derivative named DR3TBDTT with high hydrophobicity was synthesized and functioned as the hole transporting material without an ion additive. 8.8% of power conversion efficiency was obtained for CH3NH3PbI3−xClx based planar solar cells with improved stability, compared to devices using Li-TFSI doped spiro-MeOTAD.

Graphical abstract: A hydrophobic hole transporting oligothiophene for planar perovskite solar cells with improved stability

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