目前在整合微機電技術與生物醫學領域的[Lab-on-a-chip]的概念的研究上，通常需要一個工具可以在前端選擇樣品，或是移動樣品，因此相當多的研究開始往控制微小物體的研究上前進，在此方面，以介電泳力最為熱門，目前利用介電泳力來移動微小物體中，最廣為使用的是光誘發介電泳(Optically-induced dielectricphoresis) 以及旅波式介電泳(Traveling-wave dielectrophoresis twDEP)。
　　目前旅波式介電泳無法做多點操控的移動，而光誘發介電泳力需要上下兩平行版，但是整合到微流體等生醫方面，單一下會更有有優勢。因此目前我們提出運用光二極體誘發介電泳移動聚苯乙烯球的概念，希望能達到只用單一下平板就能進行多點操控的功能，概念可以看成P-oxide-N 放在本質矽基板的結構，並外加逆偏電壓，無照光時壓降都在絕緣層中並在空間上方形成電場，但是當有光照在元件上方時，由於光電流通過元件內電阻，把絕緣層上的壓降轉到電阻上，導致空間中電場減弱，使得受激發出正介電泳力的粒子，會往強電場的方向去。
　　但我們元件的內電阻不夠，必須外加電阻來完成我們的目標，所以結尾方面，我們也提出新的設計使內電阻增加。

　Biological lab on chip usually requires a tool to move biological samples on an integrated device. Therefore, there is lots of research works focused on manipulating minute objects in a microfluidic chip. Two types of mechanisms are widely applied; one is optically-induced dielectricphoresis (ODEP) and the other is traveling-wave dielectrophoresis (twDEP). TwDEP cannot do multi-object control, and ODEP usually requires two parallel plates. A single control plate has advantage in integration with a micro-fluidic platform. In this research work, we present a photodiode-induced dielectrophoretic force to control Polystyrene spheres in liquid.
The device is made of interdigitated lateral P-N junctions on an intrinsic silicon substrate. When the device operates in reverse bias without illumination, the voltage drop across the insulation layer exhibits a strong electric field in the space. On the other hand, when the device operates in reverse bias under illumination, the voltage drop reduces because photocurrent would pass through a resistor, which makes the electric field become weak. And the difference of induced positive DEP can make the particles toward a stronger electric field.
While the internal resistance of our device is not sufficient, we need to add an external resistor to achieve our goal. At the end, we propose a new design of device to increase the internal resistance.

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