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Octupole moment driven free charge generation in partially chlorinated subphthalocyanine for planar heterojunction organic photodetectors

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Title: Octupole moment driven free charge generation in partially chlorinated subphthalocyanine for planar heterojunction organic photodetectors
Authors: Rana, A
Park, SY
Labanti, C
Fang, F
Yun, S
Dong, Y
Yang, EJ
Nodari, D
Gasparini, N
Park, J-I
Shin, J
Minami, D
Park, K-B
Kim, JS
Durrant, JR
Item Type: Journal Article
Abstract: In this study, high-performance organic photodetectors are presented which utilize a pristine chlorinated subphthalocyanine photoactive layer. Optical and optoelectronic analyses indicate that the device photocurrent is primarily generated through direct charge generation within the chlorinated subphthalocyanine layer, rather than exciton separation at layer interfaces. Molecular modelling suggests that this direct charge generation is facilitated by chlorinated subphthalocyanine high octupole moment (−80 DÅ2), which generates a 200 meV shift in molecular energetics. Increasing the thickness of chlorinated subphthalocyanine leads to faster response time, correlated with a decrease in trap density. Notably, photodetectors with a 50 nm thick chlorinated subphthalocyanine photoactive layer exhibit detectivities approaching 1013 Jones, with a dark current below 10−7 A cm−2 up to −5 V. Based on these findings, we conclude that high octupole moment molecular semiconductors are promising materials for high-performance organic photodetectors employing single-component photoactive layer.
Issue Date: 13-Jun-2024
Date of Acceptance: 27-May-2024
URI: http://hdl.handle.net/10044/1/112445
DOI: 10.1038/s41467-024-49169-1
ISSN: 2041-1723
Publisher: Nature Portfolio
Journal / Book Title: Nature Communications
Volume: 15
Copyright Statement: © The Author(s) 2024. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/ licenses/by/4.0/.
Publication Status: Published
Article Number: 5058
Online Publication Date: 2024-06-13
Appears in Collections:Physics
Chemistry
Experimental Solid State
Faculty of Natural Sciences



This item is licensed under a Creative Commons License Creative Commons