Author(s): Ji, DY (Ji, Deyang); Jiang, T (Jiang, Ting); Zheng, YS (Zheng, Yingshuang); Sun, YJ (Sun, Yajing); Wei, ZM (Wei, Zhongming); Li, LQ (Li, Liqiang); Hu, WP (Hu, Wenping)

Source: ADVANCED OPTICAL MATERIALS Article Number: 2102484 DOI: 10.1002/adom.202102484 Early Access Date: FEB 2022

Abstract: Organic phototransistors (OPTs) are playing an indispensable role in organic optoelectronics, which greatly show their promising application in optical communication, video imaging, missile guidance, and night vision. However, because the thermally activated mode dominated for thin-film devices leads to a sharp drop in mobility at low temperatures, until now, most of the studies about OPTs are performed at room temperature, severely hindering their further potential optoelectronic application over a broad range of temperatures, especially at low temperature environment. In this work, the optoelectronic properties of a small molecule (2,6-diphenylanthracene, DPA) based OPTs with band-like transport are studied at low temperatures. The devices exhibit outstanding optoelectronic properties in terms of mobility (2.6 cm(2) V-1 s(-1)), on/off ratio (approximate to 10(4)), detectivity (10(13) Jones), and external quantum efficiency (2500%) even at 150 K, which is superior to the performance of devices with thermally activated mode. In addition, the organic photodetector at low temperatures is also fabricated. Our results demonstrate that organic pi-conjugated DPA small-molecule has great potential in low-temperature application.

Accession Number: WOS:000758565900001

ISSN: 2195-1071

Full Text: https://onlinelibrary.wiley.com/doi/10.1002/adom.202102484