Long-Term Stable, Self-Powered and Highly Sensitive Photodetectors Based on the ZnO:ZrO2 Composite Fibers (Fs)/N-Si Heterojunction

Zinc oxide/zirconia (ZnO:ZrO2) composite fibers (Fs) with different molar ratios, prepared by using the electrospinning technique, were deposited onto the n-Si as ZnO:ZrO2 composite Fs/n-Si hybrid heterostructures. According to the molar ratios of ZnO:ZrO2 (3:1), (1:1), and (1:3), the ZnO:ZrO2 composite Fs/n-Si devices were labeled D5, D6, and D7, respectively. In the dark, all three devices exhibited very good rectification, such that the rectification ratios were calculated as 4.76 x 10(4), 4.62 x 10(4), and 8.08 x 10(5), for the D5, D6, and D7 devices, respectively. Since it has both a higher rectification ratio and a self-powered mode, the electrical and optical properties of the D7 device were studied in detail. From the time-dependent I-V measurements, it was observed that the instrument remained stable after 30 days. It was seen that the device has remarkable photosensitivity for visible light, such that the ON/OFF ratio, responsivity, and specific detectivity were calculated to be 1.14 x 10(,)(4) 1.59 mA/W, and 3.50 x 10(11) Jones, under the illumination of 150 mW/cm(2), (at-0.1 V). Furthermore, capacitance, conductance, and impedance measurements have been performed. In summary, the proposed ZnO:ZrO2 composite Fs/n-Si device is believed to provide new insights into developing low-cost, efficient, and self-powered photodetectors for high-performance optoelectronic applications in the future.