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New heterocyclic quinoid‐based hole transporting materials (HTMs) with a rigid quinoid core [3,6‐di(2 H ‐imidazol‐2‐ylidene)cyclohexa‐1,4‐diene] have been synthesized. The new HTMs have good hole mobility (>10 −4 cm 2 V −1 s −1 ) and very intense absorption in the near‐infrared region extending to >800 nm. High performance perovskite solar cells can be fabricated using these HTMs without dopant. The best cell efficiency under simulated AM 1.5 G illumination reaches 12.22 %, which is comparable with that (12.58 %) using doped 2,2′,7,7′‐tetrakis‐( N , N ‐di‐4‐methoxyphenylamino)‐9,9′‐spirobifluorene (spiro‐OMeTAD) as the HTM.
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Ni et al. (2016) studied this question.
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