Cu2O has the advantages of low price, stable chemical properties, and high visible light absorption rate. It is a very promising hole transport material material in solar cells. However, the pure phase Cu2O has a low hole transport rate, which can be improved it by means of doping or something else. In this paper, based on the first-principles, the performance of different amounts of S, Se, and Te doped Cu2O are calculated, it is found that the Te-doped Cu2O performance is pronounced, with the energy gap reduction (1.871eV), there appear free electron generating, the Highest Occupied Molecular Orbital energy level is matched (-5.463eV), and the absorption coefficient in the ultraviolet and visible range improved, nearly 103.07% at 3.26 eV, the reflectance increased to, for the point 11.7 eV, 76%, and the loss function value is very small in the visible light region (less than 0.1).

The feasibility of CuI and C60 as hole transport layer and electron transport layer in the perovskite solar cell is tested by using the software Solar Cell Capacitance Simulator (SCAPS). It is found that the thicknesses of the absorption layer, electron transport layer and hole transport layer, and the Interface Density of Defect State of their interface have a key influence on the efficiency of the perovskite solar cells. After optimization, the efficiency was as twice as that before, 22.70% to 11.62%, and the fill factor can still be at a high value, 76%.

The optical and electrical properties of Se/Te-doped Cu2O were analyzed by first-principles and experimental characterization, and its simulation as a PSC was completed.

Natural stones undergo wet weathering, bowing and dissolution and suffer irrevocable degradation. Self-cleaning is an effective approach to stone protecting. Herein, nanomaterial enhanced protectants for Marble, Qingshi and Hedishi was developed. Inherent microscale cracks and holes exist on the polished natural stone surfaces. When modified by commercial protectant, 101S, the surfaces showed hydrophobic but not superhydrophobic. Superhydrophobicity was achieved through modification by 101S emulsions containing Al 2 O 3 and SiO 2 nano-powder. Meanwhile, the cracks and holes were reserved. The principle of the protectants prepared in this work is permeation and consolidation on the stone surfaces as well as the inner surfaces of the cracks and holes. The reservation of the micro cracks and holes on the stone surfaces is important since the breathability of the stones is remained. The superhydrophobic surfaces showed good thermal stability below 250 ºC.