“…It has been found that metal oxides (ZnO, Al 2 O 3 , and MgO), metal sulfides (Cu 3 S 3 , CdS, and ZnS), and transition metal nitrides (GaN, AlN, and InN), together with their cluster-assembled nanomaterials, are of very high interest and have been widely investigated [1][2][3][4][5][7][8][9][10][11][12][13][14][15][16][17][19][20][21], and the possible geometries and energy gaps of inner hollow semiconductor (GaN) 2n nanocages have been confirmed [21]. It has been found that the stable GaN and InN nanocages are good semiconductor materials with stronger electron mobility, which is consistent with experimental values [9,11,13,14]. Moreover, the relative stabilities of nano-size (InN) 2n and (CdS) 2n (n = 5-27) clusters have been studied, and the photon-to-current conversion efficiency related to the energy conversion of inner hollowed nano-size Cd 2n S 2n (n = 5-27) clusters has been discussed [7,9].…”