| 초록 |
Ionic defects (e.g., Lewis base and acid defects) along the grain boundaries (GBs) and on the surface of organometal halide perovskite (OHP) materials can lead to a degradation in the device performance of OHP-based optoelectronic devices by increasing non-radiative recombination and other loss processes. Therefore, the passivation of defects is important for improving the performance of OHP-based optoelectronic devices. In this work, we successfully passivated the ionic defects inside OHP materials by introducing ionic organic materials. As a result, these materials effectively passivate both cation and anion defects in the OHP films, enlarging the size of grain and lengthening the charge-carrier lifetime (τ＞1us). The performance of OHP photovoltaic cells fabricated with this additive process was improved. Furthermore, we demonstrate OHP-based photocathode cells for hydrogen production. These photocathodes exhibit a remarkable average photocurrent density and the highest stability. |
