Recently, researcher Liu Shengzhong from the National Institute of Clean Energy National Laboratory of the Chinese Academy of Sciences led a silicon-based solar cell research team in collaboration with Associate Professor Zhao Kui of Shaanxi Normal University to make new progress in the field of two-dimensional (2D) perovskite cells. Energy and Environmental Sciences.
Compared with 3D perovskite batteries, 2D organic-inorganic hybrid perovskite materials have two major advantages: adjustable photoelectric performance and excellent environmental stability. Due to the problems of low absorption coefficient, poor charge transport capacity, and large exciton binding energy of 2D perovskite, its photovoltaic performance is poor and the battery efficiency is low. Researchers doped the Cs element in the two-dimensional (BA) 2 (MA) 3Pb4I13 perovskite, which improved the battery efficiency by 13.7%, which is the highest efficiency among currently reported two-dimensional devices. The study found that the addition of Cs element is beneficial to control the crystal orientation, increase the grain size of the 2D plane, and enhance the carrier mobility and charge transport kinetics. At the same time, the stability of the 2D perovskite battery has been significantly improved. At 30% humidity, after 1400 hours, the device's efficiency remains 89%. This will help promote the commercial application of perovskite solar cells.