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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Color Quantification for Process Monitoring and Appearance Control of Thin Film PV
摘要： Product color and appearance uniformity are a critical manufacturing consideration in any industry, including solar module manufacturing. These considerations become even more important as modules are increasingly installed in locations where aesthetics is a prime consideration, such as BIPV, automotive, and consumer products. Additionally, the interaction of PV materials with visible light enables objective color characterization to be a useful tool for control of film deposition processes. In this paper we describe our efforts, learning and results controlling product color and using color as a process monitoring and control tool.
关键词： optical reflection,color,photovoltaic cells,thin film devices,process control
更新于2025-09-19 17:13:59
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Optical Fiber-Tip Monolithic Silicon Pressure Sensors
摘要： Fiber-tip interferometric pressure sensors offer high resolution over broad frequency and dynamic ranges with minimal device footprint. We fabricate a 100 μm wide monolithic silicon pressure-sensing diaphragm and reference cavity as a unit on the wafer-scale, simplifying the packaging. The 1.0 μm thick diaphragm and 1 μm thick cavity form a pressure-sensitive optical resonator which we interrogate over an optical fiber with a polished turning mirror. Our sensors function at pressures up to 3.5 atm, and have tunable dynamic ranges and sensitivities through choice of operational wavelength. We demonstrate 0.002 atm resolution over a 0.9 atm dynamic range using 1544 nm light for atmospheric pressure testing. We introduce an optical model for fiber-tip Fabry-P′erot sensors with diffraction-loss and show good agreement with experimental results. We test the devices in a wind-tunnel environment and demonstrate broadbandwidth operation and resolution competitive with standard micro-electromechanical sensors.
关键词： interferometry,Fabry-P′erot,optical fiber,microcavities,optical reflection,Pressure sensor
更新于2025-09-16 10:30:52
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Coordinated Optical Matching of a Texture Interface Made from Demixing Blended Polymers for High Performance Inverted Perovskite Solar Cells
摘要： The continuing increase of the efficiency of perovskite solar cells has pushed the internal quantum efficiency approaching 100%, which means the light-to-carrier and then the following carrier transportation and extraction are no longer limiting factors in photoelectric conversion efficiency of perovskite solar cells. However, the optimal efficiency is still far lower than the Shockley–Queisser efficiency limit, especially for those inverted perovskite solar cells, indicating significant fraction of light do not transmit into the active perovskite layer to be absorbed there. Here a planar inverted perovskite solar cell (ITO/PTAA/perovskite/PC61BM/bathocuproine (BCP)/Ag) is chosen as an example and we show that the external quantum efficiency (EQE) of it can be significantly improved by simply texturing the Poly [bis (4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) layer. By washing the film prepared from mixed polymer solution of PTAA and Polystyrene (PS), a textured PTAA/perovskite interface is introduced on the light-input side of perovskite to inhibit internal optical reflection. The reduction of optical loss by this simple texture method increases the EQE and then the photocurrent of ITO/PTAA/perovskite/PC61BM/BCP/Ag device with the magnitude about 10%. At the same time, this textured PTAA benefits the band edge absorption in this planar solar cell. The large increase of the short-circuit current together with the increase of fill factor pushes the efficiency of this inverted perovskite solar cell from 18.3% up to an efficiency over 20.8%. By using anti-reflection coating on glass to let more light into the device, the efficiency is further improved to 21.6%, further demonstrating the importance of light management in perovskite solar cells.
关键词： perovskite solar cell,interface texture,PTAA,internal optical reflection,optical matching
更新于2025-09-11 14:15:04
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Silicide phase formation by Mg deposition on amorphous Si. Ab initio calculations, growth process and thermal stability
摘要： Formation of magnesium silicides on amorphous silicon by deposition of Mg at room temperature is studied by electron energy loss spectroscopy, differential reflectance spectroscopy and high resolution transmission electron microscopy. Optimal crystal structures of Mg silicides under high pressure are found by ab initio DFT calculations. These structures are related to the particular minima of enthalpy. Dielectric functions are calculated for these structures. The transitions from the cubic phase c-Mg2Si to orthorhombic o-Mg2Si at 5.6 GPa and then from o-Mg2Si to hexagonal h-Mg2Si at 22.3 GPa are predicted using the USPEX code. The experimental spectra and the data obtained from the calculated dielectric functions are mutually consistent. Optical reflectance is suitable for monitoring the growth and transformations of the phases during experiments. During Mg deposition onto amorphous Si, the o-Mg2Si phase forms first, then the c-Mg2Si phase grows upon it. The observed sequence of phase formation is related with the compression stress arising in the depth of the Mg-Si mixture.
关键词： optical reflection spectroscopy,electron energy loss spectroscopy,solid state reactions,thin films,high resolution transmission electron spectroscopy,ab initio calculations
更新于2025-09-09 09:28:46