Open AccessTernary organic photodetectors based on pseudo-binaries nonfullerene-based acceptors
Author(s) -
Tianyi Zhang,
Maximilian Moser,
Alberto D. Scaccabarozzi,
Helen Bristow,
Polina Jacoutot,
Andrew Wadsworth,
Thomas D. Anthopoulos,
Iain McCulloch,
Nicola Gasparini
Publication year - 2021
Publication title -
jphys materials
Language(s) - English
Resource type - Journals
ISSN - 2515-7639
DOI - 10.1088/2515-7639/ac0c0a
Subject(s) - ternary operation , photodetector , materials science , responsivity , acceptor , organic solar cell , optoelectronics , energy conversion efficiency , dark current , exciton , polymer , computer science , physics , composite material , programming language , condensed matter physics , quantum mechanics
The addition of a third component to a donor:acceptor blend is a powerful tool to enhance the power conversion efficiency of organic solar cells. Featuring a similar operating mechanism, organic photodetectors are also expected to benefit from this approach. Here, we fabricated ternary organic photodetectors, based on a polymer donor and two nonfullerene acceptors, resulting in a low dark current of 0.42 nA cm −2 at −2 V and a broadband specific detectivity of 10 12 Jones. We found that exciton recombination in the binary blend is reduced in ternary devices due to the formation of a pseudo-binary microstructure with mixed donor–acceptor phases. With this approach a wide range of intermediate open-circuit voltages is accessible, without sacrificing light-to-current conversion. This results in ternary organic photodetector (TOPD) with improved Responsivity values in the near-infrared. Moreover, morphology analyses reveal that TOPD devices showed improved microstructure ordering and consequentially higher charge carrier mobilities compared to the reference devices.