- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Effects of carbon nanotube thermal conductivity on optoacoustic transducer performance
摘要： CNT-PDMS composite is regarded as a promising candidate for optoacoustic transducer application. However, the relationship between the CNT thermal conductivity and optoacoustic transducer performance is still unde?ned. To explore this relationship, four types of CNTs with different diameters and lengths were employed to successfully fabricate four types of optoacoustic transducers. The thermal properties of CNTs were analyzed and discussed in this paper; the laser-generated ultrasound and optoacoustic conversion ef?ciency of the transducers were experimentally and theoretically investigated. Results of comparison revealed the CNT with a diameter and length of 8 nm and 10e30 mm, respectively, to have the highest thermal conductivity. With this type of CNT/PDMS composite, the optoacoustic conversion ef?ciency reached as high as 9.59 (cid:1) 10-3. Overall, the results demonstrate that higher CNT thermal conductivity corresponds to better optoacoustic transducer performance.
关键词： Laser-generated ultrasound,Thermal conductivity,Optoacoustic transducer,Optoacoustic conversion ef?ciency,CNT
更新于2025-09-23 15:23:52
-
[IEEE 2019 IEEE 13th International Conference on ASIC (ASICON) - Chongqing, China (2019.10.29-2019.11.1)] 2019 IEEE 13th International Conference on ASIC (ASICON) - Design of the admittance detecting circuit for silicon waveguides using the capacitor-integration method
摘要： The in?uences of the intermediate band (IB) ?lling, the absorption coef?cient constants, and the IB position on the ef?ciency of a quantum dot intermediate band solar cell (QD-IBSC) are investigated considering the spatial variation of subbandgap generation rates. A new de?nition of optimal intermediate band ?lling is proposed. A mathematical model is developed to optimize the intermediate band solar cell (IBSC) structure under idealized conditions, which calculates the optimal ratio of the subbandgap absorption coef?cient constants and the optimal position of IB.
关键词： optimal ?lling,Intermediate band solar cell (IBSC),absorption coef?cients,IB position,conversion ef?ciency
更新于2025-09-23 15:21:01
-
Oxidation: A dominant source for reduced efficiency of silicon solar photovoltaic modules
摘要： The quality of materials plays a decisive role on the life, performance and the return on investment (ROI) of engineering systems. The photovoltaic systems on-site suffer from climate conditions such as higher temperature, snow fall, humidity, rain, thunder storm, ultraviolet radiations and other environmental gasses and exhibit characteristic degradation. In this paper, we study the effects of oxidation on the degradation of the underlying semiconductor circuitry of the solar panels and the effect of aging on the life of the solar photovoltaic systems. Our research methodology is based on monitoring, testing and evaluating the real time power and ef?ciency using image analysis.
关键词： Power degradation,Maximum output power,SPV modules,Conversion ef?ciency,Oxide defects
更新于2025-09-19 17:13:59
-
[IEEE 2019 IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT) - Coimbatore, India (2019.2.20-2019.2.22)] 2019 IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT) - Characterisation and performance evaluation of amorphous silicon nitride as passivation layer in thin film aSi:H solar cells
摘要： The fabrication and characterisation of amorphous silicon nitride layer is presented in this paper. The suitability of using it in photovoltaic application has been investigated. It is observed that the band gap of the nitride layers increases with increase in nitrogen content. The experimental results shows that amorphous silicon nitride alloy can be used as passivation layer in devices due to its high optical band gap. On the basis of experimental results, a thin ?lm aSi:H single junction solar cell having aSiNx as passivation layer has been proposed. Further, the behaviour of the proposed structure has been evaluated through simulation using SCAPS1D solar simulator. It is found out that the involvment of amorphous silicon nitride as passivation layer on the top part of the solar cell results in a conversion ef?ciency of 12.9 % and short circuit current density (Jsc) of 15.18 mA/cm2 which are signi?cant values as far as a single junction amorphous silicon thin ?lm solar cell has been considered. Furthermore, a comparison study on solar cell performance parameters of aSi:H solar cell with and without aSiNx passivation layer has been done.
关键词： composition pro?le,optical band gap,FTIR spectrum,passivation layer,PECVD,conversion ef?ciency
更新于2025-09-16 10:30:52
-
Enhanced light harvest in dye-sensitized solar cells by nanocrystals-on-microcrystals TiO <sub/>2</sub> photoanode
摘要： In this paper, we discuss the new design of a DSSC using a photoanode by inserting TiO2 particles in size of sub-micron into the photoanode with small nanoparticles. The experimental results point out that the uniform mixing of TiO2 nanoparticles can increase the photocurrent density, and then obviously improve the ef?ciency of DSSC. The best performance was achieved when the mass ratio of sub-micron particles was 5%, and the power conversion ef?ciency was 5.58%, which is 20% higher than pure TiO2 nanoparticles. This nanocrystals-on-microcrystals TiO2 photoanode can be used in DSSC with high yield for large-scale production.
关键词： photoanode,photoelectric conversion ef?ciency,dye-sensitized solar cell
更新于2025-09-12 10:27:22
-
Binary ionic liquid electrolytes for copper indium sulfide quantum dot sensitized-TiO2 solar cell to achieve long-term durability
摘要： This work demonstrates a straightforward strategy to develop the copper-indium-sul?de (CIS) quantum dot-sensitized solar cells (QDSSCs) consisting of ionic liquids (ILs) as electrolyte instead of any volatile solvent. The power conversion ef?ciency (PCE) of the solar cell yielded with 0.36% in the presence of 1-butyl-3-methylimidazolium sul?de ([BMIm][S2?/Sn2?]) and 1-butyl-3-methylimidazolium thiocyanate ([BMIm][SCN]) exhibited an improvement of JSC and FF yielding with 0.75% (JSC: 8.69 mA cm?2, VOC: 0.32 V, FF 26.8%). It exhibited long-term stability within 20% drops after 72 h-continuous photo-irradiation and subsequent storage for more than 1300 h in dark. It is due to suppression of the volatilization of solvent and decomposition of sul?de/polysul?de (S2?/Sn2?) anions. The solar cell performances were found to promote as an increase of interfacial charge transfer ef?ciency between electrolyte and electrodes by means of electrochemical impedance spectroscopy.
关键词： Electrochemical impedance spectroscopy (EIS),Power-conversion ef?ciency (PCE),Ionic liquid electrolyte,Quantum dot-sensitized solar cell,Copper indium-sul?de (CIS) colloids
更新于2025-09-12 10:27:22