Performance Optimization Of Photovoltaic Nanogenerators For Field Exploration

Petroleum is black gold,the blood of modern industry,and it is closely related to our lives.In recent years,with the development of China's economy,it is more and more dependence on petroleum energy.However,a large part of the oil consumed in China is imported from abroad.In order to reduce the import dependence of resources,we need to explore new petroleum fields to solve the problem.In the petroleum exploration process,researchers need to carry heavy exploration equipment to the desert to find petroleum.If the exploration equipment is powered off,the petroleum exploration work will be suspended.The use of solar energy in the petroleum exploration process can effectively compensate for the shortage of power for the exploration equipment.Based on the reference of piezoelectric nanogenerators,we propose to use photovoltaic nanogenerators to solve the power supply problem in the field of petroleum exploration.In order to improve the performance of photovoltaic nanogenerators,the physical properties of the nanowires are first optimized.In this paper,bismuth nitrate and ferric chloride are used as raw materials.Mainly research factors are solvent type,precipitant type,mineralizer concentration,reaction temperature,holding time and so on.Most of the products are pure bismuth ferrite,ethylene glycol methyl ether is a suitable solvent.Nanowires growth with the increases of mineralizer concentration and reaction time.At 200°C,54 h,the sample has more nanowires and more uniform morphology.The optical band gap of the nanowires is closely related to particle size.Decreasing the nanowires particle size can reduce the optical band gap.The band gap of the bismuth ferrite sample is about 1.6~2.2 eV.The macroscopic performance of nanowires is an external manifestation of microdomain performance,so it is important to determine the microdomain properties of nanowires and their influencing factors to optimize their macroscopic properties.The morphology and related properties of nanowires were investigated by transmission electron microscopy and scanning probe microscopy.The results show that the bismuth ferrite nanowire prepared in this paper is a multi-domain structure of single crystal,When the 85 V and 42 V are applied to nanowires of different lengths,the angle of the domain deflection is approximately 180°,means that longer nanowires require higher voltages to deflect the domains.The piezoelectric coefficient is 22.21pm/V.The apex of the nanowires has the highest current and a low center current.There is a significant lag in the I-V curve.Optimizing the device structure is also an important measure to improve the performance.In this paper,considering the circuit structure and other factors,five kinds of electrode structures are designed and fabricated on the silicon substrate.Different electrode structures can be used to regulate the output power of the nanogenerator.With the increase of annealing temperature,the photo-generated voltage and photo-generated current first increase and then decrease.At 500°C,the short-circuit current and open-circuit voltage are the largest,which are37.57 mA and 508.22 mV,respectively.With the increase of holding time,the photoelectric conversion efficiency first increases and then decreases,and the maximum holding time is 6 h,the photoelectric conversion efficiency is 0.683%.As the light intensity increases,the open circuit voltage and short-circuit current of the photovoltaic nanogenerator first increase and then decrease;when the light intensity is 30 W/cm~2,it reaches the maximum.