Purpose-The purpose of this paper is to present a selective wet-etching method of boron doped low-pressure chemical vapour deposition (LPCVD) polysilicon film for the realization of piezoresistors over the bulk micromachined diaphragm of (100) silicon with improved yield and uniformity. Design/methodology/approach-The method introduces discretization of the LPCVD polysilicon film using prior etching for the grid thus dividing each chip on the entire wafer. The selective etching of polysilicon for realizing of piezoresistors is limited to each chip area with individual boundaries. Findings-The method provides a uniform etching on the entire silicon wafer irrespective of its size and leads to economize the fabrication process in a batch production environment with improved yield. Research limitations/implications-The method introduces one extra process step of photolithography and subsequent etching for discretizing the polysilicon film. Practical implications-The method is useful to enhance yield while defining metal lines for contact purposes on fabricated electronic structures using microelectronics. Stress developed in LPCVD polysilicon can be removed using proposed approach of discretization of polysilicon film. Originality/value-The work is an outcome of regular fabrication work using conventional approaches in an R&D environment. The proposed method replaces the costly reactive ion etching techniques with stable reproducibility and ease in its implementation.
This paper describes a fluorescence biosensor based on a microfluidic device where an organic LED is used as light emitting source. The device was able to detect fluorescence from a 0.012 µl volume chamber containing 3 ng of donkey anti-sheep IgG (Immunoglobulin G) conjugates tagged with Alexafluor 488 fluorophores. The minimum detectable concentration of the antibody was identified at an enzyme concentration of 200 µg/mL. This result shows that organic LED sources can be used as emitter/photodetector pairs to test biological samples. Based on our results, a multipurpose, integrated biological sensor that can identify and measure the concentration of fluorophore substances is dicussed..
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