Acta Phys. -Chim. Sin. ›› 2017, Vol. 33 ›› Issue (1): 249-254.doi: 10.3866/PKU.WHXB201610142

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CH3NH3PbI3 Single Crystal-Based Ambipolar Field-Effect Transistor with Ta2O5 as the Top Gate Dielectric

Qian-Rui LÜ,Jing LI,Zhi-Peng LIAN,Hao-Yan ZHAO,Gui-Fang DONG*(),Qiang LI,Li-Duo WANG,Qing-Feng YAN*()   

  • Received:2016-08-22 Published:2016-12-29
  • Contact: Gui-Fang DONG,Qing-Feng YAN;
  • Supported by:
    National Natural Science Foundation of China(51173097);National Natural Science Foundation of China(91333109);National Key Basic Research Program of China(2013CB632900);Tsinghua University Initiative Scientific Research Program, China(20131089202);Tsinghua University Initiative Scientific Research Program, China(20161080165);Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics, China(KF201516)


Organic-inorganic hybrid perovskite methylammonium lead iodide (CH3NH3PbI3) generally tends to show n-type semiconductor properties. In this work, a field-effect transistor (FET) device based on a CH3NH3PbI3 single crystal with tantalum pentoxide (Ta2O5) as the top gate dielectric was fabricated. The p-type field-effect transport properties of the device were observed in the dark. The hole mobility of the device extracted from transfer characteristics in the dark was 8.7×10-5 cm2·V-1·s-1, which is one order of magnitude higher than that of polycrystalline FETs with SiO2 as the bottom gate dielectric. In addition, the effect of light illumination on the CH3NH3PbI3 single-crystal FET was studied. Light illumination strongly influenced the field effect of the device because of the intense photoelectric response of the CH3NH3PbI3 single crystal. Different from a CH3NH3PbI3 polycrystalline FET with a bottom gate dielectric, even with the top gate dielectric shielding, light illumination of 5.00 mW·cm-2 caused the hole current to increase by one order of magnitude compared with that in the dark (VGS (gate-source voltage)=VDS (drain-source voltage)=20 V) and the photoresponsivity reached 2.5 A·W-1. The introduction of Ta2O5 as the top gate dielectric selectively enhanced hole transport in the single-crystal FET, indicating that in the absence of external factors, by appropriate device design, CH3NH3PbI3 also has potential for use in ambipolar transistors.

Key words: Perovskite, Tantalum pentoxide, Field-effect, Mobility, Light illumination