A high mobility air-stable n-type organic small molecule semiconductor with high UV-visible-to-NIR photoresponse

An organic semiconductor with high carrier mobility and efficient light absorption over a wide spectral range is crucial for broadband responsive organic photodetectors. This paper reports the fabrication of high-performance n-type semiconducting crystalline nanosheets and air-stable field-effect transistors and phototransistors with high broadband response. The n-type small molecule semiconductor, assembled into crystalline nanosheets using a solvent-phase interfacial self-assembly method, demonstrates high electron mobility and excellent air stability. The resulting phototransistors exhibit ultrahigh responsivity (9.2 × 10⁵ AW⁻¹) and specific detectivity (5.26 × 10¹³ Jones) from 365 to 940 nm, surpassing previously reported n-type organic small molecule-based phototransistors.

Ying-Shi Guan, Jing Qiao, Yingying Liang, Hari Krishna Bisoyi, Chao Wang, Wei Xu, Daoben Zhu, Quan Li