4.8 Article

Self-Powered Red/UV Narrowband Photodetector by Unbalanced Charge Carrier Transport Strategy

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 7, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202007016

Keywords

narrowband photodetection; p‐ MAPbI(2)Br; Red; UV recognition; self‐ powering; unbalanced electron; hole transport

Funding

  1. AFOSR Biophysics program [FA9550-20-1-0157]
  2. IEE Stewardship Seed Grant Program
  3. NIFA [2019-67021-28991]
  4. National Science Foundation [1936432]
  5. Air Force Office of Scientific Research [FA9550-17-1-0341]
  6. Office of Naval Research [N000141912461]
  7. U.S. Department of Defense (DOD) [N000141912461] Funding Source: U.S. Department of Defense (DOD)
  8. Direct For Mathematical & Physical Scien
  9. Division Of Materials Research [1936432] Funding Source: National Science Foundation

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A new type of self-doped perovskite material with unique charge transport characteristics for intrinsic narrowband detection in photodetectors has been reported in this study, demonstrating a new strategy of manipulating internal charge transport for power-free and filter-free intrinsic narrowband photodetectors.
Narrowband photodetector (NB-PD) with selective light detection is critical for artificial vision and imaging. Intrinsic (optical-filter-free) NB-PDs using conjugated organics or halide perovskite materials have been developed for eliminating the current complex filtering systems in NB-PDs. However, the poor performance and external driving circuit of organic NB-PDs as well as complex doping and uncontrollable recombination reactions in typical perovskite NB-PDs have limited their applicational diversification. A p-type self-doped perovskite for intrinsic NB detection is reported which exhibits unique unbalanced electron-hole transfer kinetics. In conjunction with the optical field distribution, an unbalanced charge transport within the self-doped perovskite triggers a wavelength-dependent photo-carrier collection, resulting in a novel spontaneous internal quantum efficiency narrowing mechanism. As a result, by reverting the device architectural polarity, an NB detection at a monochromic light of either red or UV is observed. Using such a revertible asymmetric device design, self-powered NB-PDs are successfully achieved. Briefly, the corresponding NB-PDs exhibit excellent narrow response with a response window of approximate to 100 nm, high detectivity approximate to 10(11) Jones, and fast response speed (f(-3dB) approximate to 60 kHz) at zero bias. These results demonstrate a new strategy of manipulating internal charge transport to realize power-free and filter-free intrinsic NB-PDs.

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