Replacement of Biphenyl by Bipyridine Enabling Powerful Hole Transport Materials for Efficient Perovskite Solar Cells

Here, 2,2′‐ and 3,3′‐bipyridine are introduced for the first time as the core structure to get two new hole transport materials (HTMs), namely F22 and F33. The electron‐withdrawing nature of bipyridine lowers the HOMO level of the new compounds and enhances the open‐circuit voltage of perovskite sol...

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