Consequently, it is hard for designers to predict and clarify the tunneling current of SETs (MTs), making the realization of nano-device circuit extremely difficult.

• 因此對一個元件設計者而言非常不容易預測及釐清單電子電晶體及分子電晶體的穿隧電流，從而使得奈米元件電路難以成真。