Photosensitive biosensor array system using optical addressing without an addressing circuit on array biochips

Chang-Geun Ahn; Chil Seong Ah; Tae-Youb Kim; Chan Woo Park; Jong-Heon Yang; Ansoon Kim; Gun Yong Sung
September 2010
Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p103703
Academic Journal
This paper introduces a photosensitive biosensor array system with a simple photodiode array that detects photocurrent changes caused by reactions between probe and target molecules. Using optical addressing, the addressing circuit on the array chip is removed for low-cost application, and real cell addressing is achieved using an externally located computer-controllable light-emitting diode array module. The fabricated biosensor array chip shows a good dynamic range of 1–100 ng/mL under prostate-specific antigen detection, with an on-chip resolution of roughly 1 ng/mL.


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