2D materials for conducting holes from grain boundaries in perovskite solar cells

Peng You, Guanqi Tang, Jiupeng Cao, Dong Shen, Tsz Wai Ng, Zafer Hawash, Naixiang Wang, Chun Ki Liu, Wei Lu, Qidong Tai, Yabing Qi, Chun Sing Lee, Feng Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

56 Citations (Scopus)


Grain boundaries in organic–inorganic halide perovskite solar cells (PSCs) have been found to be detrimental to the photovoltaic performance of devices. Here, we develop a unique approach to overcome this problem by modifying the edges of perovskite grain boundaries with flakes of high-mobility two-dimensional (2D) materials via a convenient solution process. A synergistic effect between the 2D flakes and perovskite grain boundaries is observed for the first time, which can significantly enhance the performance of PSCs. We find that the 2D flakes can conduct holes from the grain boundaries to the hole transport layers in PSCs, thereby making hole channels in the grain boundaries of the devices. Hence, 2D flakes with high carrier mobilities and short distances to grain boundaries can induce a more pronounced performance enhancement of the devices. This work presents a cost-effective strategy for improving the performance of PSCs by using high-mobility 2D materials.

Original languageEnglish
Article number68
JournalLight: Science and Applications
Issue number1
Publication statusPublished - 31 Mar 2021

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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