Citation:
	            
		            LÜ Qian-Rui,  LI Jing,  LIAN Zhi-Peng,  ZHAO Hao-Yan,  DONG Gui-Fang,  LI Qiang,  WANG Li-Duo,  YAN Qing-Feng. CH3NH3PbI3 Single Crystal-Based Ambipolar Field-Effect Transistor with Ta2O5 as the Top Gate Dielectric[J]. Acta Physico-Chimica Sinica,
							;2017, 33(1): 249-254.
						
							doi:
								10.3866/PKU.WHXB201610142
						
					
				
					
				
	        
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	                	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.
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								Keywords:
								
 - Perovskite,
 - Tantalum pentoxide,
 - Field-effect,
 - Mobility,
 - Light illumination
 
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