Mesoporous NiO nanosheet network as efficient hole transporting layer for stable inverted perovskite solar cells

摘要

Hole transporting layer (HTL) plays an important role in device stability and charge transport for inverted perovskite solar cells (PSCs). Here, a novel HTL consisted of mesoporous NiO nanosheet (NS) was fabricated via simple hydrothermal method. The contract region of HTL/perovskite was increased by using the mesoporous NiO NS network structure, resulting in the good interface contract and rapid charge transfer. Therefore, the corresponding devices exhibit an optimal power conversion efficiency of 12%, with hysteresis-less. Besides, the developed PSCs still maintain 75% efficiency after 500 h, implying its good stability. In a word, this mesoporous NiO NS structure can be a promising candidate for HTL of inverted PSCs. (C) 2018 Elsevier B.V. All rights reserved.