| 초록 |
The newly synthesized tris(4-(1-phenyl-1H-benzo[d]imidazole)phenyl)phosphine oxide (TIPO) small molecule is used as an n-type interlayer in perovskite photovoltaic for enhancing electron transport with restricted traps. This small molecule material contains phenyl benzimidazole functional groups combined with the phosphine oxide core, contributing to effective charge extraction and improved stability. TIPO improves charge transport because phosphine oxide and benzimidazole have high polarity and π- electrons, and suppresses the resistance of the device by passivating it based on a smooth surface morphology. Also, the TIPO interlayer improves the stability of the device by capturing I-ions to form a perovskite layer. The electron extraction and electrical resistance were proved by space charge limiting current and impedance, the surface shape was analyzed by atomic force microscopy, and the stability improvement principle was verified by X-ray photoelectron spectroscopy. |
