| abstract |
The invention discloses a light-absorbing layer material of a solar cell, which is a perovskite material with a surplus of 1% to 3% mol of methylammonium iodide, and the molecular formula is (FA 0.8 MA 0.2 ) 0.95 Cs 0.05 (I 0.6 Br 0.4 ) 3 . The invention also discloses a wide band gap perovskite solar cell, including the above light absorption layer material. The invention also discloses the preparation method of the above-mentioned perovskite solar cell with a band gap. The light-absorbing layer is prepared by adding an excessive amount of methyl ammonium iodide solid to the perovskite precursor solution, and then heating and crystallizing by anti-solvent method . The invention suppresses the phase separation degree of the perovskite light-absorbing layer, reduces the defect density of the perovskite film at the same time, increases the crystallinity and stability of the perovskite crystal, and can improve the open circuit voltage and fill factor of the device, thereby improving the solar cell photoelectric conversion efficiency and stability. The solar cell prepared by the invention has the feature of low-temperature processing, which is beneficial to the large-area preparation of the cell. |