Ag-Doped Halide Perovskite Nanocrystals for Tunable Band Structure and Efficient Charge Transport

Shu Zhou, Yaping Ma, Guodong Zhou, Xin Xu, Minchao Qin, Yuhao Li, Yao Jane Hsu, Hanlin Hu, Gang Li, Ni Zhao, Jianbin Xu, Xinhui Lu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

40 Citations (Scopus)

Abstract

Heterovalent doping of halide perovskite nanocrystals (NCs), offering potential tunability in optical and electrical properties, remains a grand challenge. Here, we report for the first time a controlled doping of monovalent Ag + into CsPbBr 3 NCs via a facile room-temperature synthesis method. Our results suggest that Ag + ions act as substitutional dopants to replace Pb 2+ ions in the perovskite NCs, shifting the Fermi level down toward the valence band and in turn inducing a heavy p-type character. Field effect transistors fabricated with Ag + -doped CsPbBr 3 NCs exhibit 3 orders of magnitude enhancement in hole mobility at room temperature, compared with undoped CsPbBr 3 NCs. Low-temperature electrical studies further confirm the influence of Ag + doping on the charge-carrier transport. This work demonstrates the tunability of heterovalent doping on the electrical properties of halide perovskite NCs, shedding light on their future applications in versatile optoelectronic devices.

Original languageEnglish
Pages (from-to)534-541
Number of pages8
JournalACS Energy Letters
Volume4
Issue number2
DOIs
Publication statusPublished - 8 Feb 2019

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry

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