Ternary organic photodetectors based on pseudo-binaries nonfullerene-based acceptors

Tianyi Zhang, Maximilian Moser, Alberto D. Scaccabarozzi, Helen Bristow, Polina Jacoutot, Andrew Wadsworth, Thomas D. Anthopoulos, Iain McCulloch, Nicola Gasparini

Research output: Contribution to journalArticlepeer-review

Abstract

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 1012 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 OPD with improved R values in the NIR. Moreover, morphology analyses reveal that ternary OPD devices showed improved microstructure ordering and consequentially higher charge carrier mobilities compared to the reference devices.
Original languageEnglish (US)
JournalJournal of Physics: Materials
DOIs
StatePublished - Jun 16 2021

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