Abstract
Here, we report on an integrated sensor system based on InGaN heterostructures for (bio)chemical sensing. The system is compact in size and fits into a relatively small volume, which makes it versatile for many applications including liquid biomolecule and gas sensing in hospitals or doctors’ offices. A GaN-based heterostructure with an InGaN quantum well close to its surface excited by a 405 nm diode laser reacts to molecules adsorbing on the surface (quantum-confined Stark effect, QCSE) by shifting its photoluminescence (PL) emission wavelength, thus acting as a chemical sensor. The PL signal is guided to a linear wavelength selecting filter and then detected by a split Si photodiode. This simplification yields reduction in size and cost; possible limitations and challenges are discussed. Simulation calculations about the split diode detector responsiveness indicate that best results can be obtained when fitting the diode spectral resolution to the width of the PL signal of the InGaN sensor and the expected PL shift. The system's utility is applied to different analytes, such as isopropanol, ferritin and apoferritin. For ferritin, a wavelength shift sensitivity of 9.6nmmg/ml was found.
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