In situ impedance measurements, Raman measurements and theoretical calculations were performed to investigate the electrical transport and vibrational properties of polycrystalline phenanthrene. Two phase transitions were observed in the Raman spectra at 2.3 and 5.9 GPa, while phenanthrene transformed into an amorphous phase above 12.1 GPa. Three discontinuous changes in bulk and grain boundary resistance and relaxation frequency with pressure were attributed to the structural phase transitions. Grain boundaries were found to play a dominant role in the carrier transport process of phenanthrene. The dielectric performance of phenanthrene was effectively improved by pressure. A significant mismatch between Z″ and M″ peaks was observed, which was attributed to the localized electronic conduction in phenanthrene. Theoretical calculations showed that the intramolecular interactions were enhanced under compression. This study offers new insight into the electrical properties as well as grain boundary effect in organic semiconductors at high pressure.

就地进行阻抗测量、拉曼测量和理论计算以研究多晶菲的电传输和振动特性。在 2.3 和 5.9 GPa 的拉曼光谱中观察到两个相变，而菲在 12.1 GPa 以上转变为非晶相。体积和晶界电阻以及松弛频率随压力的三个不连续变化归因于结构相变。发现晶界在菲的载流子传输过程中起主导作用。压力有效地提高了菲的介电性能。之间的严重不匹配Z“ 和 米” 峰被观察到，这归因于菲中的局部电子传导。理论计算表明，分子内相互作用在压缩下增强。这项研究为有机半导体在高压下的电学特性和晶界效应提供了新的见解。