Semiconductor-based photodetectors (PDs) convert light signals into electrical signals via a photon–matter interaction process, which involves surface/interface carrier generation, separation, and transportation of the photo-induced charge media in the active media, as well as the extraction of these charge carriers to external circuits of the constructed nanostructured photodetector devices. Because of the specific electronic and optoelectronic properties in the low-dimensional devices built with nanomaterial, surface/interface engineering is broadly studied with widespread research on constructing advanced devices with excellent performance. However, there still exist some challenges for the researchers to explore corresponding mechanisms in depth, and the detection sensitivity, response speed, spectral selectivity, signal-to-noise ratio, and stability are much more important factors to judge the performance of PDs. Hence, researchers have proposed several strategies, including modification of light absorption, design of novel PD heterostructures, construction of specific geometries, and adoption of specific electrode configurations to modulate the charge-carrier behaviors and improve the photoelectric performance of related PDs. Here, in this brief review, we would like to introduce and summarize the latest research on enhancing the photoelectric performance of PDs based on the designed structures by considering their surface/interface engineering and how to obtain advanced nanostructured photo-detectors with improved performance, which could be applied to design and fabricate novel low-dimensional PDs with ideal properties in the near future.
Constructing highly efficient heterojunction photocatalyst is vital but difficult for solving the environmental crises. The CuBi 2 O 4 /Ag 3 PO 4 photocatalyst has been synthesized by hydrothermal and solution precipitating method. The fabricated CuBi 2 O 4 /Ag 3 PO 4 composite exhibits improved property for the degradation of tetracycline (TC) and nearly 80 % of TC (50 mg/ L) is degraded within 30 min, especially its rate constant (k = 0.04366 min À 1 ) is about 13.48 and 1.63 times higher than those of pure CuBi 2 O 4 (0.003240 min À 1 ) and Ag 3 PO 4 (0.02676 min À 1 ). The excellent photocatalytic performance was attributed to the heterojunction interfaces and the effective separation of the photo-generated carriers driven by the reasonable energy band alignment in the heterostructure. The CuBi 2 O 4 / Ag 3 PO 4 composite displays good stability, and the present of different inorganic ions has rather small effect on the degradation of TC. A possible photocatalytic mechanism of CuBi 2 O 4 /Ag 3 PO 4 composite is proposed based on the active species trapping experiment. It proves that the CuBi 2 O 4 / Ag 3 PO 4 composite has potential application in environmental remediation.
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