Perovskite solar cell with improved performance passivated by all inorganic perovskite quantum dots

Improving the efficiency and stability of perovskite solar cells is the main direction of realizing their commercial application. Interface passivation is one of the most effective methods. Through interface passivation, on the one hand, the energy level of the device can be adjusted and the photoelectric conversion efficiency (PCE) of the device can be improved; on the other hand, materials that are not sensitive to the environment can be selected to improve the stability of the device. All inorganic perovskite quantum dots (QDs) have excellent environmental stability and are similar to the crystal structure of the absorbing layer of perovskite solar cells, so they have the potential for interface passivation. In this paper, two kinds of all inorganic perovskite QDs with different morphology, size and crystal structure were synthesized by hot injection method, which were used as the passivation layer of perovskite solar cells, and improved the device performance. The PCE of the device treated with CsPbBr₃ QDs can reach as high as 20.45%, and has excellent environmental stability.