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Title: Coupling of Infrared Active Colloidal Quantum Dots and Amorphous Selenium for Fast and Sensitive Photodetection

Journal Article · · Advanced Functional Materials
 [1];  [2];  [1];  [2];  [1];  [1];  [3];  [2];  [4]; ORCiD logo [1]
  1. New York Univ. (NYU), NY (United States)
  2. Stony Brook Univ., NY (United States)
  3. Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  4. Stony Brook Univ., NY (United States); Cornell Univ., Ithaca, NY (United States)

Colloidal quantum dot (CQD) based infrared (IR) photodetectors offer facile wavelength tunability in the IR and low-cost fabrication. However, owing to their large surface areas, CQDs intrinsically have significant surface traps critically affecting the speed of CQD photodetectors, typically mediated through tedious surface passivation efforts. In this report, an alternative strategy involving coupling of near-IR photoactive lead sulfide CQDs with a thermally evaporated amorphous selenium (a-Se) hole transport layer is proposed. By separating the detector into a photon absorbing CQD region and a charge transport a-Se region, the study takes advantage of the extremely low noise, predominantly hole-only transport process in a-Se. Here, a high 3 dB bandwidth of 2.5 MHz and a competitive specific detectivity of 2.5 × 1011 Jones at room temperature are demonstrated at 980 nm. This report serves as a first demonstration of strong coupling between an IR active CQD absorber and a-Se, which paves the path to obtain fast and highly photoresponsive IR photodetection in the future.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); Defense Advanced Research Projects Agency (DARPA)
Grant/Contract Number:
SC0012704
OSTI ID:
2352188
Report Number(s):
BNL--225615-2024-JAAM
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 32 Vol. 34; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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