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We have studied surface passivation layers for the application on n -type bifacial silicon solar cells. Thereby, we have examined their optimal composition and thickness with regards to passivation quality, optical properties, and especially the contact formation during a co-firing step. These parameters were addressed in separate investigations: 1) simulation of the optical properties...
The demand for high-density electronic applications is growing. This work develops a novel chip-on-flex (COF) package with sidewall-insulated Au-coated polyimide (PI) compliant-bumps. A double-layer anisotropic conductive adhesive (ACA) material that meets the assembly requirement is adopted for the ultra-fine pitch interconnects. A process for manufacturing 20- μm pitch compliant-bumps is proposed...
Microstructure and properties of the Al-7Si-0.5Mg-xLi (x=1, 2, 3) alloys were investigated. The microstructure was observed by optical microscopy, DSC was determined by a differential scanning calorimetry, and the hardness was determined by Vicker's tester. The results show that the primary Si phases are present in the alloys. The amount and size of primary Si phase increase with the increment of...
Qualitative and quantitative analysis of the composition in the paste of complex cements have been determined by means of X-ray diffraction (XRD),differential scanning calorimetry (DSC) and directly-heating method. Results show that the composition of hydration products in coal gangue-cement complex system is similar to that in pure cement system, but the content of hydration products for per unit...
This paper introduces a class of single crystal silicon micro-scale differential scanning calorimeters for rapid detection and thermal characterization of energetic materials. The suspended membrane micro hotplates have fast time response and high sensitivity, which enables thermal measurements of melting endotherms and deflagration exotherms in energetic materials such as RDX and TNT. The potential...
We present a novel room temperature bonding technique using reactive multilayer Ni/Al foils as local heat sources to heat intermediate adhesion layers and thus bond silicon wafers to form wafer level package. Exothermic reactions in Ni/Al multilayer foils were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). XRD measurements showed that the dominant product after...
In this paper, the effects of the degree of cure of an anisotropic conductive film (ACF) on the material properties and the contraction stress build-up of the ACF and ACF joints stability were investigated. The degrees of cure of the ACF as a function of bonding times were quantitatively obtained by a dynamic DSC study and an attenuated total reflectance/Fourier transform infrared (ATR/FT-IR) analysis...
This paper introduces an array of single crystal silicon micro hotplates for differential scanning calorimetry. Based on heat transfer analysis considering tradeoffs between response time, temperature uniformity, and measurement sensitivity, suspended membrane micro hotplates with full backside release were found to be optimal designs. Due to the requirements of routine sample loading, the size of...
A nonlinear optical (NLO) active alkoxysilane chromophore (SGDR1) was successfully synthesized. A fluorinated polyimide/SGDR1 composite was prepared to improve the poor temporal stability of nonlinearity at elevated temperature for the reported poled sol-gel film. The poled composite film was characterized by FTIR, DSC, TGA and UV-Vis. Results show that the composite displays good hydrophobic properties,...
A nanocalorimeter is presented consisting of a silicon chip with germanium thermistors. Thermistors patterned on a silicon nitride membrane provide highly sensitive thermal measurements. Differential measurements can be performed by comparison with thermistors patterned on the bulk- silicon. Temperature scanning measurements enable to determine the phase transition temperatures(Tm) of various phase-change...
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