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Due to the lack of the urban household registration or property owner, many residents of urban residential areas in China have been in the state of lack of rights. The policy of "Equal rights for home tenants and owners" cannot play a practical role due to the lack of legal norms. "Home ownership" and "Right of residents" contain different contents. That is, "equal access to basic public services and social welfare of the place of residence, as well as the right to participate in decision-making, management and supervision of public affairs in residential communities and residential areas due to the fact of stable residence." The rights of the occupants is different from housing right and habitation right. The right of the occupants has not only legal basis, but also practical basis.

The perovskite (CH3NH3PbI3) films on the planar hetero-junction perovskite solar cells (PHJ-PSCs) are fabricated by "two-steps" process with the wet spin-coating method. The precursor (PbI2) solu- tions are compounded with 4 types of solvents: N-Methyl Pyrrolidone (NMP), γ-butyrolactone (GBL), Dimethyl Sulfoxide (DMSO) and N, N-dimethylformamide (DMF). All the solutions have the same concentration. The influences of different precursor solvents to the micro-structures of CH3NH3PbI3 films and device performance are studied. Atomic force microscopy (AFM) and scanning electron microscope (SEM) are used to characterize the CH3NH3PbI3 films. The results indicate that the CH3NH3PbI3 film using DMF solvent possesses more rough morphology and thickest thickness. The monolithic PHJ-PSCs devices based on DMF solvent are tested under a standard one sun of simulated solar irradiation (AM1.5). The results show that the open-circuit voltage (Voc) reaches 872mV, the short-circuit current (Jsc) reaches 9.35mA/cm2, the filling factor(FF) is 0.62 and the photo- current conversion efficiency (PCE) is 5.05%. DMF is the best one among these 4 types of solvents for PHJ-PSCs.