Abstract
Harvesting energy from humidity is an environmentally friendly technology. In arid regions, instead of negative impact of humidity, it is also feasible to capture water from the air, making our device suitable without the need for any external power supply. Self-powered photodetectors are in high demand due to their low power consumption and suitability for wearable electronics. Herein, we have incorporated Bi2Te3 nanosheets with MoS2 on a flexible and biodegradable cellulose paper substrate to create the device. According to XPS analysis, Bi 4F7/2 and Bi 4F5/2 levels were identified at binding energies of 157.62 eV and 162.90 eV, respectively indicating double splitting of the Bi atoms. In such a novel Bi2Te3/MoS2 nanohybrid photodetector, rapid electron transfer at Bi2Te3 and MoS2 interface occurs due to humidity, significantly enhancing performance of the photodetectors in the UV spectral range. This performance is better as compared to conventional MoS2-based photodetector, exploiting the unique properties of topological insulator Bi2Te3. The device demonstrated the highest responsivity of 19.1 A/W and detectivity of 7.81×1011 Jones, exhibiting significant responsivity of 3.74 mA/W and detectivity of 9.59×109 Jones even at 0 V with minimum optical signal of 68.9 μW/cm2. It also offers the highest external quantum efficiency of 6471.29%.
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