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Ultra-narrowband NIR Photomultiplication Organic Photodetectors based on Charge Injection Narrowing

Abstract : Ultra-narrowband NIR photomultiplication organic photodetectors (PM-OPDs) were realized in ITO/PEDOT:PSS/active layers/Al based on the interfacial-traps induced charge injection narrowing (CIN) concept. The rather less Bod Ethex-Hex (BEH) is imbedded in polymer donor matrix to form some isolated electron traps. The trapped electrons in BEH closing Al electrode will force interfacial band-bending for hole-tunneling-injection, resulting in the photomultiplication. The PM-OPDs with P3HT:BEH as active layers exhibit narrow response peak at 850 nm with full width at half-maximum (FWHM) of 27 nm, as well as a rather weak response from 650 m to 800 nm. The rejection ratios (RRs) are 11 at EQE 855 nm /EQE 700 nm and 10 at EQE 855 nm /EQE 750 nm , respectively. The EQE of 29,700% at 850 nm was achieved in the PM-OPDs by incorporating 0.02 wt% F 6 TCNNQ under-13 V bias. An EQE of 15,300% at 850 nm was achieved in the ternary PM-OPDs at-13 V bias, with the markedly enhanced RRs of 44 at EQE 855 nm /EQE 700 nm and 30 at EQE 855 nm /EQE 750 nm. This work provides a smart strategy to achieve highly efficient ultra-narrowband NIR PM-OPDs by adjusting trapped-electron-distribution near hole injection electrode and molecular arrangement for enhancing hole mobility in active layers.
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https://hal-cnrs.archives-ouvertes.fr/hal-03405470
Contributor : Nicolas Leclerc Connect in order to contact the contributor
Submitted on : Wednesday, October 27, 2021 - 11:50:55 AM
Last modification on : Wednesday, December 1, 2021 - 3:32:13 PM

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Ming Liu, Jian Wang, Zijin Zhao, Kaixuan Yang, Pablo Durand, et al.. Ultra-narrowband NIR Photomultiplication Organic Photodetectors based on Charge Injection Narrowing. Journal of Physical Chemistry Letters, American Chemical Society, 2021, ⟨10.1021/acs.jpclett.1c00330⟩. ⟨hal-03405470⟩

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