摘要
Hole transporting layers (HTLs) have critical roles in the performance of perovskite solar cells. In this study, films of the vacuum-deposited small molecule of Tris[4-(5-phenylthiophene-2-yl)phenyl]amine (TPTPA) are demonstrated as efficient HTL materials for perovskite solar cells. The horizontal molecular stacking of the TPTPA neat film leads to the exceptionally high hole drift mobility of 7 × 10 −3 cm 2 V −1 s −1 , among the highest values observed in the organic molecular neat films. By doping with MoO 3 , a clear charge transfer state is formed and the hole mobility further increases to 3.6 × 10 −2 cm 2 V −1 s −1 . Both normal- and inverted-structured perovskite solar cells utilizing these HTLs are prepared and optimized; they show high power conversion efficiencies of 17–18%.