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

Abstract

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
Volume97
Issue number11
DOIs
StatePublished - Oct 25 2022
Externally publishedYes

ASJC Scopus subject areas

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

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