Properties of Silver Nanostructures Incorporated Perovskite Based Thin Films for Solar Cell Applications

Silver nanostructures (Ag nanoparticles, Ag@SiO2 core-shell nanoparticles & Ag nanowires) were firstly added into aluminum oxide isopropanol solution to form cellular Al2O3 mesoporous layers for perovskite solar cell applications, respectively. Then CH3NH3PbI3 organic-inorganic hybrid perovskites were fabricated and attached to this matrix. Absorption spectra of Al2O3/CH3NH3PbI3 composite and CH3NH3PbI3 were found to be basically the same in the visible region, indicating that Al2O3 had less impact on the absorption performance of CH3NH3PbI3. However, the incorporation of silver nanostructures could significantly improve the absorption properties of the perovskites, and the best performance could be achieved with the concentration ratios of Ag nanoparticles, Ag@SiO2 core-shell nanoparticles and Ag nanowires of 0.15, 0.3 and 0.15, respectively. Further increasing the concentration of silver incorporation 第 9期 檀满林, 等: 银纳米相吸收增强型钙钛矿太阳电池薄膜的制备及性能研究 909 would probably cause halogenation and reduce the absorption properties of CH3NH3PbI3. In addition, the efficiency of perovskite solar cell could be improved from original 6.28% to 7.09% after addition of Ag@SiO2 core-shell nanoparticles. In contrast, the incorporation of Ag nanoparticles & nanowires tended to reduce the short circuit current density and conversion efficiency of the fabricated solar cells, because they could prolong the internal carrier transport path and hence increase the recombination probability of the electron-hole pairs.