Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions

The dissociation of charge-transfer (CT) states into free charge carriers at donor–acceptor (DA) interfaces is an important step in the operation of organic solar cells and related devices. In this paper, we show that the effect of DA morphology and architecture means that the directions of CT state...

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Main Author:	Inche Ibrahim, Mohd Lukman
Format:	Article
Language:	English English
Published:	Institute of Physics 2017
Subjects:	QC Physics TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices
Online Access:	http://irep.iium.edu.my/56144/ http://irep.iium.edu.my/56144/ http://irep.iium.edu.my/56144/ http://irep.iium.edu.my/56144/1/J%20Phys%20D%20Appl%20Phys%2050%20065103%20%282017%29.pdf http://irep.iium.edu.my/56144/7/56144-Dissociation%20of%20charge-transfer%20states%20at%20donor-acceptor%20interfaces%20of%20organic%20heterojunctions_SCOPUS.pdf

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spelling	iium-561442018-10-30T01:25:21Z http://irep.iium.edu.my/56144/ Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions Inche Ibrahim, Mohd Lukman QC Physics TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices The dissociation of charge-transfer (CT) states into free charge carriers at donor–acceptor (DA) interfaces is an important step in the operation of organic solar cells and related devices. In this paper, we show that the effect of DA morphology and architecture means that the directions of CT states (where a CT state’s direction is defined as the direction from the electron to the hole of the CT state) may deviate from the direction of the applied electric field. The deviation means that the electric field is not fully utilized to assist, and could even hinder the dissociation process. Furthermore, we show that the correct charge carrier mobilities that should be used to describe CT state dissociation are the actual mobilities at DA interfaces. The actual mobilities are defined in this paper, and in general are not the same as the mobilities that are used to calculate electric currents which are the mobilities along the direction of the electric field. Then, to correctly describe CT state dissociation, we modify the widely used Onsager–Braun (OB) model by including the effect of DA morphology and architecture, and by employing the correct mobilities. We verify that when the modified OB model is used to describe CT state dissociation, the fundamental issues that concern the original OB model are resolved. This study demonstrates that DA morphology and architecture play an important role by strongly influencing the CT state dissociation as well as the mobilities along the direction of the electric field. Institute of Physics 2017-02-15 Article PeerReviewed application/pdf en http://irep.iium.edu.my/56144/1/J%20Phys%20D%20Appl%20Phys%2050%20065103%20%282017%29.pdf application/pdf en http://irep.iium.edu.my/56144/7/56144-Dissociation%20of%20charge-transfer%20states%20at%20donor-acceptor%20interfaces%20of%20organic%20heterojunctions_SCOPUS.pdf Inche Ibrahim, Mohd Lukman (2017) Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions. Journal of Physics D: Applied Physics, 50 (6). pp. 1-9. ISSN 0022-3727 E-ISSN 1361-6463 http://iopscience.iop.org/article/10.1088/1361-6463/50/6/065103/pdf 10.1088/1361-6463/50/6/065103
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English
topic	QC Physics TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices
spellingShingle	QC Physics TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices Inche Ibrahim, Mohd Lukman Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
description	The dissociation of charge-transfer (CT) states into free charge carriers at donor–acceptor (DA) interfaces is an important step in the operation of organic solar cells and related devices. In this paper, we show that the effect of DA morphology and architecture means that the directions of CT states (where a CT state’s direction is defined as the direction from the electron to the hole of the CT state) may deviate from the direction of the applied electric field. The deviation means that the electric field is not fully utilized to assist, and could even hinder the dissociation process. Furthermore, we show that the correct charge carrier mobilities that should be used to describe CT state dissociation are the actual mobilities at DA interfaces. The actual mobilities are defined in this paper, and in general are not the same as the mobilities that are used to calculate electric currents which are the mobilities along the direction of the electric field. Then, to correctly describe CT state dissociation, we modify the widely used Onsager–Braun (OB) model by including the effect of DA morphology and architecture, and by employing the correct mobilities. We verify that when the modified OB model is used to describe CT state dissociation, the fundamental issues that concern the original OB model are resolved. This study demonstrates that DA morphology and architecture play an important role by strongly influencing the CT state dissociation as well as the mobilities along the direction of the electric field.
format	Article
author	Inche Ibrahim, Mohd Lukman
author_facet	Inche Ibrahim, Mohd Lukman
author_sort	Inche Ibrahim, Mohd Lukman
title	Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
title_short	Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
title_full	Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
title_fullStr	Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
title_full_unstemmed	Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
title_sort	dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions
publisher	Institute of Physics
publishDate	2017
url	http://irep.iium.edu.my/56144/ http://irep.iium.edu.my/56144/ http://irep.iium.edu.my/56144/ http://irep.iium.edu.my/56144/1/J%20Phys%20D%20Appl%20Phys%2050%20065103%20%282017%29.pdf http://irep.iium.edu.my/56144/7/56144-Dissociation%20of%20charge-transfer%20states%20at%20donor-acceptor%20interfaces%20of%20organic%20heterojunctions_SCOPUS.pdf
first_indexed	2023-09-18T21:19:13Z
last_indexed	2023-09-18T21:19:13Z
_version_	1777411768950194176

Dissociation of charge-transfer states at donor–acceptor interfaces of organic heterojunctions

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