Surface transfer doping induced effective modulation on ambipolar characteristics of few-layer black phosphorus

Nature Communications
Du XiangWei Chen

Abstract

Black phosphorus, a fast emerging two-dimensional material, has been configured as field effect transistors, showing a hole-transport-dominated ambipolar characteristic. Here we report an effective modulation on ambipolar characteristics of few-layer black phosphorus transistors through in situ surface functionalization with caesium carbonate (Cs2CO3) and molybdenum trioxide (MoO3), respectively. Cs2CO3 is found to strongly electron dope black phosphorus. The electron mobility of black phosphorus is significantly enhanced to ~27 cm(2) V(-1) s(-1) after 10 nm Cs2CO3 modification, indicating a greatly improved electron-transport behaviour. In contrast, MoO3 decoration demonstrates a giant hole-doping effect. In situ photoelectron spectroscopy characterization reveals significant surface charge transfer occurring at the dopants/black phosphorus interfaces. Moreover, the surface-doped black phosphorus devices exhibit a largely enhanced photodetection behaviour. Our findings coupled with the tunable nature of the surface transfer doping scheme ensure black phosphorus as a promising candidate for further complementary logic electronics.

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Citations

Nov 7, 2015·The Journal of Physical Chemistry Letters·Yuanyuan HeJiansheng Jie
Mar 5, 2016·Nano Letters·Steven P KoenigBarbaros Özyilmaz
Nov 26, 2015·The Journal of Physical Chemistry Letters·Andres Castellanos-Gomez
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Aug 19, 2015·ACS Nano·Jinshui MiaoChuan Wang
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Oct 27, 2015·ACS Applied Materials & Interfaces·Peng LiNailiang Yin
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Feb 10, 2017·ACS Applied Materials & Interfaces·Zhaoqiang ZhengGuowei Yang
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Nov 26, 2016·Advanced Materials·Yuda ZhaoYang Chai
Feb 6, 2017·PLoS Computational Biology·Berta VerdJohannes Jaeger
May 21, 2016·Physical Chemistry Chemical Physics : PCCP·Lixiu GuanJunguang Tao
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Jan 14, 2016·Nanoscale·Qi FengKaiyou Wang
Jan 16, 2020·Physical Chemistry Chemical Physics : PCCP·XiangDong YangHongYing Mao

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