摘要
Aiming to reduce the defects of perovskite film and improve carrier transport,an organic small molecule,benzo[d]isothiazol-3(2H)-one 1,1-dioxide(OBS),is introduced as an additive in the solution-processing of perovskite and prepare uniform perovskite films with a continuous distribution of OBS at grain boundaries.Fourier trans-form infrared spectroscopy and X-ray photoelectron spectroscopy are conducted to reveal the interactions of hydrogen bonding and coordina tion bonding between OBS and perovskite.Various characterizations(including X-ray diffraction,UV-vis spectroscopy,electrochemical impedance spectroscopy,etc.)are conducted to uncover the effect of OBS on device performance.Consequently,high efficiency of 23.26%is obtained for the OBS-treated device,while the control device shows only a companion efficiency of 21.60%.
