Abstract
A Se nanorod film is successfully synthesized on a hydrothermally grown CdS layer through a facile vapor phase deposition process, forming a n-CdS/p-Se heterojunction. By virtue of the narrow direct bandgap and large absorption coefficient in UV-visible range of CdS and Se, the integrated CdS/Se photodetector exhibits excellent self-powered behavior in a wide spectral range. In particular, the heterojunction device shows a high photoresponse under weak light irradiation (500 nm, 1.08 μW/cm2) with a large on-off ratio (9 × 103), high responsivity (40 mA/W) and detectivity (1.3 × 1013 Jones), and fast response speed (rise time 2 μs and decay time 22 ms).
Highlights
The next-generation optoelectronic devices require low power consumption, miniature size, and reduced weight.[1,2,3] As a significant optoelectronic device, the photodetector with the ability to transform optical signal into electric signal, has wide applications in the fields of environmental monitoring, space exploration, flame detection, and light communication.[4,5,6] it is desirable to fabricate self-powered photodetectors that can operate without external sources so as to scale down the devices to smaller dimensions and broaden their applications
As a typical II-VI semiconductor, cadmium sulfide (CdS) with a narrow and direct bandgap of 2.4 eV has been considered as an ideal building block for constructing highly efficient electronic and optoelectronic devices.[13,14]
Yang et al demonstrated an integrated system of a self-powered CdS single nanowire photodetector powered by an efficient microscale microbial fuel cell (MFC), which was constructed on the base of a carbon fiber and ZnO nanowire hybrid structure.[17]
Summary
The next-generation optoelectronic devices require low power consumption, miniature size, and reduced weight.[1,2,3] As a significant optoelectronic device, the photodetector with the ability to transform optical signal into electric signal, has wide applications in the fields of environmental monitoring, space exploration, flame detection, and light communication.[4,5,6] it is desirable to fabricate self-powered photodetectors that can operate without external sources so as to scale down the devices to smaller dimensions and broaden their applications. Designing CdS/Se heterojunction as highperformance self-powered UV-visible broadband photodetector
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