Research Information System
7th International Conference on Optics, Photonics and Lasers (OPAL' 2024), Balears, Spain, 15 - 17 May 2024, pp.11-13
This study reports the development of a novel metal-semiconductor-metal (MSM) photodetector utilizing a self-assembled DNA-functionalized nanoparticle network as the light-sensitive element. The approach involves the conjugation of silver nanowires (Ag NWs) and CdSe/ZnS quantum dots (QDs) with single-stranded DNAs that are complementary to each other. Upon hybridization, the QDs serve as connectors between the Ag NWs, forming a network. This network is subsequently deposited between two metal electrodes to establish the MSM architecture. The presence of Ag NWs allows for the network between the electrodes to possess a finite conductivity. Upon exposure to irradiation, the NWs and QDs absorb light and undergo local heating. Consequently, the hydrogen bonds connecting the QDs and NWs weaken, hindering charge carrier transport and resulting in negative photoconductivity. Our proof-of-concept device demonstrates a negative responsivity of 437 A/W with seconds-long response time under a bias of 1 V.