High-Performance Flexible Ultraviolet (UV) Phototransistor Using Hybrid Channel of Vertical ZnO Nanorods and Graphene.
A flexible ultraviolet (UV) photodetector based on ZnO nanorods (NRs) as nanostructure sensing materials integrated into a graphene (Gr) field-effect transistor (FET) platform is investigated with high performance. Based on the negative shift of the Dirac point (VDirac) in the transfer characteristics of a phototransistor, high-photovoltage responsivity (RV) is calculated with a maximum value of 3 × 10(8) V W(-1). The peak response at a wavelength of ∼365 nm indicated excellent selectivity to UV light. The phototransistor also allowed investigation of the photocurrent responsivity (RI) and photoconductive gain (G) at various gate voltages, with maximum values of 2.5 × 10(6) A W(-1) and 8.3 × 10(6), respectively, at a gate bias of 5 V. The UV response under bending conditions was virtually unaffected and was unchanged after 10,000 bending cycles at a bending radius of 12 mm, subject to a strain of 0.5%. The attributes of high stability, selectivity, and sensitivity of this flexible UV photodetector based on a ZnO NRs/Gr hybrid FET indicate promising potential for future flexible optoelectronic devices.
Vinh Quang
VQ
Dang
Tran Quang
TQ
Trung
Le Thai
le T
Duy
‡SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Korea.
Bo-Yeong
BY
Kim
Saqib
S
Siddiqui
Wonil
W
Lee
‡SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon, Kyunggi-do 440-746, Korea.
Nae-Eung
NE
Lee
ZnO nanorods; field-effect transistor; flexible; graphene; ultraviolet photodetector