Ag-Doped Halide Perovskite Nanocrystals for Tunable Band Structure and Efficient Charge Transport
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AbstractHeterovalent 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 CsPbBr3 NCs via a facile room-temperature synthesis method. Our results suggest that Ag+ ions act as substitutional dopants to replace Pb2+ 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 CsPbBr3 NCs exhibit 3 orders of magnitude enhancement in hole mobility at room temperature, compared with undoped CsPbBr3 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.
All Author(s) ListZhou S, Ma YP, Zhou GD, Xu X, Qin MC, Li YH, Hsu YJ, Hu HL, Li G, Zhao N, Xu JB, Lu XH
Journal nameACS Energy Letters
Year2019
Month2
Volume Number4
Issue Number2
PublisherAmerican Chemical Society
Pages534 - 541
ISSN2380-8195
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesChemistry, Physical;Electrochemistry;Energy & Fuels;Nanoscience & Nanotechnology;Materials Science, Multidisciplinary;Chemistry;Electrochemistry;Energy & Fuels;Science & Technology - Other Topics;Materials Science

Last updated on 2020-05-04 at 01:57