Innovative and efficient photodetectors (PDs) using carbon dots (CDs) have drawn tremendous interest from electrochemical analyses in recent years. This study develops a chips Ahoy cookies-like architecture comprising CDs-decorated SnSe 2 (CSS) through a simple hydrothermal method. The CSS-based PDs demonstrate excellent photo-responsive behaviors with optimal photocurrent density ( P ph , 60.13 μA cm −2 ), photoresponsivity ( R ph , 56.03 μA W −1 ), and detectivity (2.84 × 10 10 Jones). The benefits of CDs for the enhanced photodetection of CSS were ascribed to the synergy between CDs and SnSe 2 providing an engineered interface and abundant active surface sites. It was also found that the unique morphology of CSS was compatible with the performance enhancement of CDs under optimal conditions. In this way, the CSS-based flexible PDs can enrich the fundamental study of CDs and pave the way for the exploration of diselenide-based composites for electrochemical photodetection.
Wei Wang,Yujun Deng,Shuai Sun,Massimiliano Galluzzi,Yang Jiao,Paul K. Chu,Zeren Li,Jia Li,Jianquan Yao
Visible-blind ultraviolet (VBUV) photodetectors are designed for UV detection without responding to visible light, thus having many applications in communications, flame detection, environment monitoring, and astronomy. Herein, an organic device concept based on the bulk heterojunction (BHJ) photodiode is presented for high-performance VBUV photodetection and imaging. The BHJ, comprised of an organic electron donor, 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene (C8-BTBT), and an electron acceptor, indene-C 60 bisadduct (ICBA), shows efficient generation and transport of free charges upon UV irradiation. The organic photodiode (OPD) delivers exceptional VBUV photodetection performance. At a low voltage of −0.5 V, the device exhibits a wide linear dynamic range of 98.15 dB. Furthermore, the OPD can detect ultra-low light intensities down to 0.58 µW cm −2 with a high photoresponsivity of 0.12 A W −1 and specific detectivity of 2.75 × 10 12 Jones. More importantly, by integrating the OPD with a readout integrated circuit, the pixel-array organic VBUV imager is demonstrated to have high-quality imaging capability. The results reveal a novel strategy to design VBUV photodetectors and imagers with balanced performance, cost, area, flexibility, and power consumption.
危险品化学品经营许可证（带存储）