Tunable perovskite-based photodetectors in optical sensing

SENSORS AND ACTUATORS B-CHEMICAL

卷:321

Article

Wolanyk, Joshua^1,2,3  Xiao, Xun⁴  Fralaide, Michael^1,5  Lauersdorf, Nicholas J.⁴  Kaudal, Rajiv^1,2  Dykstra, Erik^1,2  Huang, Jinsong⁴  Shinar, Joseph^1,2  Shinar, Ruth^3,5 

[1] Iowa State Univ, Ames Lab, US DOE, Ames, IA 50011 USA

[2] Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA

[3] Iowa State Univ, Microelect Res Ctr, Ames, IA 50011 USA

[4] Univ N Carolina, Dept Appl Phys Sci, Chapel Hill, NC 27599 USA

[5] Iowa State Univ, Dept Elect & Comp Engn, Ames, IA 50011 USA

关键词: Perovskite photodetectors;    Organic photodetectors;    Optical sensors;    Photoluminescence decay time;    Oxygen monitoring;    Glucose monitoring;   

DOI  :  10.1016/j.snb.2020.128462

来源: Elsevier

【 摘 要 】

Broad- and narrow-band, tunable perovskite photodetectors (PPDs) with size-dependent fast response times are demonstrated for the first time in optical sensing of analytes, including gas-phase and dissolved oxygen (DO), as well as glucose. The sensors included a LED excitation source and a polystyrene film with embedded oxygen sensitive dyes, PtOEP or PdOEP. The analyte's dose-dependent photoluminescence (PL) intensity I and decay time tau were measured. Using the PPDs enabled monitoring gas-phase O-2 at levels of 0 %-100 % with a sensitivity comparable to that of a Si photodiode. A broad dynamic range was similarly observed for DO monitoring and the limit of detection for glucose monitoring was -0.02 mM at an initial level of -0.26 mM DO. Importantly, the size-dependent fast response time of the PPDs enabled analyte monitoring via the preferred measurement of tau, rather than I, over a broad dynamic range, which was unattainable with organic photodetectors. The use of the narrow-band PPDs eliminated the need for optical filters, which leads to more compact device designs.

【 授权许可】

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