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P-doped organic semiconductor: Potential replacement for PEDOT:PSS in organic photodetectors

Author(s): Herrbach, J; Revaux, A; Vuillaume, D; Kahn, Antoine

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Abstract: In this work, we present an alternative to the use of PEDOT:PSS as hole transport and electron blocking layers in organic photodetectors processed by solution. As Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is known to be sensitive to humidity, oxygen, and UV, removing this layer is essential for lifetime improvements. As a first step to achieving this goal, we need to find an alternative layer that fulfills the same role in order to obtain a working diode with similar or better performance. As a replacement, a layer of poly[(4,8-bis-(2-ethylhexyloxy)-benzo(1,2-b:4,5-b′)dithiophene)-2,6-diyl-alt-(4-(2-ethylhexanoyl)-thieno[3,4-b]thiophene-)-2-6-diyl)] (PBDTTT-c) p-doped with the dopant tris-[1-(trifluoroethanoyl)-2-(trifluoromethyl)ethane-1,2-dithiolene] (Mo(tfd-COCF3)3) is used. This p-doped layer effectively lowers the hole injection barrier, and the low electron affinity of the polymer prevents the injection of electrons into the active layer. We show similar device performance under light and the improvements of detection performance with the doped layer in comparison with PEDOT:PSS, leading to a detectivity of 1.9 � 1013 cm (Hz)1/2 (W)-1, competitive with silicon diodes used in imaging applications. Moreover, contrary to PEDOT:PSS, no localization of the p-doped layer is needed, leading to a diode active area defined by the patterned electrodes.
Publication Date: 19-Aug-2016
Electronic Publication Date: 19-Aug-2016
Citation: Herrbach, J, Revaux, A, Vuillaume, D, Kahn, A. (2016). P-doped organic semiconductor: Potential replacement for PEDOT:PSS in organic photodetectors. Applied Physics Letters, 109 (10.1063/1.4961444
DOI: doi:10.1063/1.4961444
Type of Material: Journal Article
Journal/Proceeding Title: Applied Physics Letters
Version: Author's manuscript

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