Abstract
InN is a remarkable material for solar cell application in the last few years because the energy band gap of InN is about 0.7 V. Recently, the large intrinsic surface charge accumulation near InN surface is discovered and this phenomenon results in the positively charged surface states. From the chemical of view, such surface states act as the acidic ligands which can adsorb basic ligands. Based on this property, this thesis investigated the sensing property of InN based anion sensor for the acid, salt and base solutions for the first time. The results show that there is negative surface potential induced in InN when InN based anion sensor dipping in these solutions. In fact, the sensing responses only depend on the Coulomb interaction on the InN/liquid interface and consist with the charge and potential consist model obviously. Moreover, the charge and discharge behaviors of InN based anion sensor are the same with the capacitor. In addition, the native oxide on the InN surface affects the sensitivity and stability due to the weaker electric attraction. The most important of all, InN has the excellent potential for the anion sensor applications for three reasons. First, InN based anion sensor has high repeatability. Second, the selectivity depends on the Coulomb interaction on the surface, not the lipophilicity. Third, the response is faster.