Using charge collection narrowing to tune from broadband to narrowband all-polymer photodetectors

Xiao Wang, Yuan Fang, Hui Jin, Wei Jiang, Mile Gao, Paul L. Burn, Paul E. Shaw

Research output: Contribution to journalArticlepeer-review


We report an all-polymer photodiode comprising a new electron-transporting polymer, PNNTH, that contains naphthalene diimide and thiazole moieties. PNNTH has strong absorption at around 670 nm and an electron mobility of ≈10−4 cm2 V−1 s−1. Bulk heterojunction films composed of PNNTH blended with the donor polymer, PBDTT-FTTE, in a weight ratio of 1:2 were found to have electron and hole mobilities of ≈10−5 cm2 V−1 s−1 and ≈10−4 cm2 V−1 s−1, respectively. The photoresponse of conventional and inverted organic photodiodes containing the blend could be tuned from broadband (400–800 nm) to narrowband (50 nm full-width-at-half-maximum) simply by changing the thickness of the all-polymer blend. The narrowband response was achieved using the charge collection narrowing mechanism, which was enhanced by the unbalanced charge mobility. Transfer matrix-based optical modelling confirmed the wavelength dependence of the photoresponse. For both the broadband and narrowband photodiodes, the specific detectivity was greater than 1011 Jones.
Original languageEnglish (US)
Pages (from-to)115817
JournalPhysica Scripta
Issue number11
StatePublished - Oct 25 2022
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-10-31
Acknowledgements: The work was carried at the Centre for Organic Photonics & Electronics at The University of Queensland. WJ acknowledges an Australian Centre for Advanced Photovoltaics Fellowship. This program has been supported by the Australian Government through the Australian Renewable Energy Agency (ARENA). The Australian Government, through ARENA, is supporting Australian research and development in solar photovoltaic and solar thermal technologies to help solar power become cost competitive with other energy sources. The views expressed herein are not necessarily the views of the Australian Government, and the Australian Government does not accept responsibility for any information or advice contained herein. PLB was an Australian Research Council Laureate Fellow (FL160100067). This work was performed in part at the Queensland node of the Australian National Fabrication Facility (ANFF-Q): a company established under the National Collaborative Research Infrastructure Strategy to provide nano and micro fabrication facilities for Australia's researchers. We acknowledge Qasim Saleem, Federico Cruciani and Pierre Beaujuge from King Abdullah University of Science and Technology (KAUST) for the high temperature GPC measurement. The authors thank Dr Dani Stoltzfus and the CSIRO (Australia) for the photoelectron spectroscopy in air measurements.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics


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