Boron-Stabilized Planar Neutral π‑Radicals with Well-Balanced Ambipolar Charge-Transport Properties

Organic neutral π-monoradicals
are promising semiconductors
with balanced ambipolar carrier-transport abilities, which arise from
virtually identical spatial distribution of their singly occupied
and unoccupied molecular orbitals, SOMO­(α) and SOMO­(β),
respectively. Herein, we disclose a boron-stabilized triphenylmethyl
radical that shows outstanding thermal stability and resistance toward
atmospheric conditions due to the substantial spin delocalization.
The radical is used to fabricate organic Mott-insulator transistors
that operate at room temperature, wherein the radical exhibits well-balanced
ambipolar carrier transport properties.

有机中性π单自由基（π-monoradicals）是一类极具应用潜力的半导体材料，其具备平衡的双极性载流子传输性能，该性能源自其单电子占据分子轨道（SOMO(α)）与未占据分子轨道（SOMO(β)）几乎完全一致的空间分布。在此，我们报道了一种硼稳定化三苯甲基自由基，得益于显著的自旋离域效应，该自由基展现出优异的热稳定性与耐大气环境性能。该自由基被用于制备可在室温下工作的有机莫特绝缘体（Mott-insulator）晶体管，且该自由基在此器件中展现出平衡的双极性载流子传输特性。