| 초록 |
Herein, we report the synthesis, characterization, and optoelectronic applications (i.e., organic field-effect transistors (OFETs) and organic phototransistors (OPTs)) of a novel class of ultralow-bandgap copolymers (PDAP-Fu, PDAP-Th, and PDAP-Se) on the basis of the unique, interesting, yet rarely researched bicyclic 2,5-diazapentalene (DAP) strong acceptor in conjugation with chalcogenophene donors. Regarding the OFET studies, PDAP-Se exhibits the highest hole mobility of 4.76 × 10−1 cm2 V−1 s−1. Besides, investigations of the OPTs indicate that a high photoresponse is achieved for all the copolymers at a wavelength of 1060 nm in the NIR spectral region combined with an excellent external quantum efficiency (EQE) and photodetectivity (D*). This is particularly true for PDAP-Se (EQE = 6.56 × 104% and D* = 1.80 × 1012 Jones). Thus, such ultralow-bandgap copolymers are promising candidates for use in integrated circuits and optoelectronic devices. |
