Systematic Optical Design of Constituting Layers to Realize High-Performance Red-Selective Thin-Film Organic Photodiodes

Seongwon Yoon, Chang Woo Koh, Han Young Woo, Dae Sung Chung

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


A high-performance red-selective thin-film organic photodiode (OPD) is designed. Dual-band absorbing poly[(2,5-bis(2-hexyldecyloxy)phenylene)-alt-(5,6-difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]-thiadiazole)] (PPDT2FBT) is introduced as the photoactive donor layer of a planar heterojunction OPD in conjunction with a sol–gel synthesized ZnO acceptor layer. The active layer thickness is systematically controlled to suppress band II absorption (λmax = 420 nm) of PPDT2FBT without sacrificing band I absorption (λmax = 650 nm). The optimal PPDT2FBT thickness is 320 nm to realize red-selective absorption while maintaining the low dark current density of the OPD (predicted by optical simulation conducted using the transfer matrix method). In addition, the introduction of ZnO (with a strategically determined thickness) as an acceptor layer in front of PPDT2FBT in an illumination pathway enables further suppression of band II absorption because of the blue color filter effect. Consequently, the resulting OPD with a device architecture of indium tin oxide/ZnO/PPDT2FBT/MoO3/Ag shows an outstanding red-selective photodiode performance with peak detectivity up to 3.04 × 1012 Jones and a high linear dynamic range of 116 dB.

Original languageEnglish
Article number1701085
JournalAdvanced Optical Materials
Issue number4
Publication statusPublished - 2018 Feb 19

Bibliographical note

Funding Information:
S.Y. and C.W.K. contributed equally to this work. This research was supported by Space Core Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2014M1A3A3A02034707). This work was also supported by the National Research Foundation (NRF) of Korea (2016M1A2A2940911).

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim


  • color selectivities
  • high detectivities
  • optical manipulations
  • optical simulations
  • organic photodiodes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics


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