Fast piezoresistive sensor and UV photodetector based on Mn-doped ZnO nanorods

作者：Chey Chan Oeurn^*; Liu Xianjie; Alnoor Hatim; Nur Omer; Willander Magnus

来源：Physica Status Solidi-Rapid Research Letters, 2015, 9(1): 87-91.

DOI：10.1002/pssr.201409453

• ZnO nanorods
• Mn doping
• hydrothermal method
• piezoresistive sensors
• ultraviolet photodetectors
• optical properties

A low cost hydrothermal synthesis method to synthesize Mn-doped ZnO nanorods (NRs) with controllable morphology and structure has been developed. Ammonia is used to tailor the ammonium hydroxide concentration, which provides a source of OH- for hydrolysis and precipitation during the growth instead of HMT. The morphological, chemical composition, structural, and electronic structure studies of the Mn-doped ZnO NRs show that the Mn-doped ZnO NRs have a hexagonal wurtzite ZnO structure along the c-axis and the Mn ions replace the Zn sites in the ZnO NRs matrix without any secondary phase of metallic manganese element and manganese oxides observed. The fabricated PEDOT:PSS/Zn0.85Mn0.15O Schottky diode based piezoresistive sensor and UV photodetector shows that the piezoresistive sensor has pressure sensitivity of 0.00617 kPa(-1) for the pressure range from 1 kPa to 20 kP and 0.000180 kPa(-1)for the pressure range from 20 kPa to 320 kPa with relatively fast response time of 0.03 s and the UV photodetector has both relatively high responsivity and fast response time of 0.065 A/W and 2.75 s, respectively. The fabricated Schottky diode can be utilized as a very useful human-friendly interactive electronic device for mass/force sensor or UV photodetector in everyday living life. This developed device is very promising for small-size, low-cost and easy-to-customize application-specific requirements.

• 出版日期2015-1