Stability of biofunctionalized GaAs surface

Ximing Ding; Jan J. Dubowski

doi:10.1117/12.717119

13 March 2007 Stability of biofunctionalized GaAs surface

Ximing Ding, Jan J. Dubowski

Proceedings Volume 6458, Photon Processing in Microelectronics and Photonics VI; 64581C (2007) https://doi.org/10.1117/12.717119
Event: Lasers and Applications in Science and Engineering, 2007, San Jose, California, United States

Abstract

For a semiconductor based biosensor, functionalization of the surface and the stability of the semiconductor-biomolecule interface are the primary issues to be addressed by researchers. We have investigated a variety of strategies to passivate (001) GaAs surface with a long chain hexadecanethiol (C₁₆H₃₃SH: T16). GaAs substrates were cleaned and etched either with ArF excimer laser irradiation in an atmospheric environment or with conventional wet etchants. The effect of surface passivation and stability of the interface were evaluated using photoluminescence (PL) measurements. Significant cleaning of the (001) GaAs surface has been achieved with an ArF laser, as evidenced by the up to 4-fold increase of the PL signal. This compares to the 12-fold enhancement of the PL signal from samples that were alternately etched in solutions of NH₃/H₂O and HCl/ethanol. A combination of a diluted base and an acid possibly provides the cleanest surface and therefore the highest surface functionalization efficacy and long term stability upon thiolation.

Citation Download Citation

Ximing Ding and Jan J. Dubowski "Stability of biofunctionalized GaAs surface", Proc. SPIE 6458, Photon Processing in Microelectronics and Photonics VI, 64581C (13 March 2007); https://doi.org/10.1117/12.717119

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