Experimental study demonstrates high-efficiency broadband photodetection in an organic-inorganic heterojunction, indicating strong potential for optoelectronics.
This article reports an organic/inorganic hybrid wideband photodetector (PD) made of a topological insulator (TI), Bi2Se3, and a donor-acceptor covalent polymeric framework (CPF) material (PDI-Tz) on a p-type Si substrate. Due to the formation of a strong type-II heterojunction between the CPF and TI, remarkably low dark current levels are expected. The fabricated PD exhibited a broadband photodetection capability ranging between 400 and 1100 nm with a peak responsivity and detectivity of 11.91 A/W and2.51× 10^15Jones at 400 nm. In addition, the PD offered an ultrahigh external quantum efficiency (EQE) of 3457% at 400 nm. Furthermore, stable time-dependent photoresponse characteristics with millisecond-order transient metrics indicate the efficacy of the fabricated PD.
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Yuvaraj et al. (2024) studied this question.
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