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DOI: 10.1002/adma. 201402415 to 7.2% for solid-state dye-sensitized solar cells (ssDSCs)[7] and 15.4% for perovskite solar cells (PSCs);[8] both champion results have been achieved using Spiro-OMeTAD as the HTM. However, previous studies have demonstrated that the onerous synthesis [9] and low charge-carrier mobility [10] of Spiro-OMeTAD significantly limit its potential of up-scaling for applications of ssDSCs and PSCs.[11, 12] Therefore, the development of a new generation of HTMs [13] with low cost, facile synthesis and high charge-carrier mobility is of high priority.[6, 14] Carbazole-based derivatives have attracted much attention because of their interesting photochemical properties.[15] Recent interest in the carbazole derivatives has been caused by its good charge-transport function, which can be exploited in the molecular design of new types of HTMs in organic light-emitting diodes (OLED)[16] and …