CaP3: A New Two-Dimensional Functional Material with Desirable Band Gap and Ultrahigh Carrier Mobility

Ning Lu, Zhiwen Zhuo, Hongyan Guo, Ping Wu, Wei Fa, Xiaojun Wu, Xiao Cheng Zeng

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


Two-dimensional (2D) semiconductors with direct and modest band gap and ultrahigh carrier mobility are highly desired functional materials for nanoelectronic applications. Herein, we predict that monolayer CaP3 is a new 2D functional material that possesses not only a direct band gap of 1.15 eV (based on HSE06 computation) but also a very high electron mobility up to 19930 cm2 V-1 s-1, comparable to that of monolayer phosphorene. More remarkably, contrary to bilayer phosphorene which possesses dramatically reduced carrier mobility compared to its monolayer counterpart, CaP3 bilayer possesses even higher electron mobility (22380 cm2 V-1 s-1) than its monolayer counterpart. The band gap of 2D CaP3 can be tuned over a wide range from 1.15 to 0.37 eV (HSE06 values) through controlling the number of stacked CaP3 layers. Besides novel electronic properties, 2D CaP3 also exhibits optical absorption over the entire visible-light range. The combined novel electronic, charge mobility, and optical properties render 2D CaP3 an exciting functional material for future nanoelectronic and optoelectronic applications.

Original languageEnglish (US)
Pages (from-to)1728-1733
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number7
StatePublished - Apr 5 2018

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry


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