Ferrocene derivatives enable ultrasensitive perovskite photodetectors with enhanced reverse bias stability
Author(s)
Type
Journal Article
Abstract
Despite the great potential of lead-halide perovskite photodetectors for broadband photodetection, ion migration in perovskites and parasitic charge injection from adjacent layers remain major challenges, ultimately leading to device failure. Here, the novel use of an ultra-thin layer of ferrocenyl-bis-phenyl-2-carboxylate (FcPhc2) is demonstrated as a hole-blocking layer. It is shown that FcPhc2 creates an energetic barrier between the perovskite and the electron transport layer, significantly reducing hole injection from the Ag contact. This improvement results in an ultralow noise spectral density of 1.2 × 10−14 A Hz−1/2, and a high specific detectivity of 8.1 × 1012 Jones at −0.5 V and 740 nm. In addition, FcPhc2 effectively inhibits I− oxidation induced by injected holes and reduces formed I2 on the perovskite surface, enhancing reverse bias stability. The increase in detectivity and stability does not compromise the high response speed of FcPhc2-based devices that operate on the scale of 150 ns and 1.3 MHz at −0.5 V in photo- and electrical-responses.
Date Issued
2026-03-12
Date Acceptance
2025-02-28
Citation
Advanced Functional Materials, 2026, 36 (21)
ISSN
1616-301X
Publisher
Wiley
Journal / Book Title
Advanced Functional Materials
Volume
36
Issue
21
Copyright Statement
© 2025 The Author(s). Advanced Functional Materials published by Wiley-VCH GmbH This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
License URL
Subjects
Chemistry
Chemistry, Multidisciplinary
Chemistry, Physical
ferrocene
interlayer
Materials Science
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
noise current
PERFORMANCE
perovskite photodetectors
Physical Sciences
Physics
Physics, Applied
Physics, Condensed Matter
reverse bias stability
Science & Technology
Science & Technology - Other Topics
Technology
Publication Status
Published
Article Number
2424556
Date Publish Online
2025-03-20