Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells

The dissociation of polaron pairs into free charge carriers in organic bulk heterojunction solar cells is a fundamental step in generating photocurrent and is still in debate. In this study, we propose two simple criteria that can be used to test the validity of any polaron pair dissociation model f...

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Main Author:	Inche Ibrahim, Mohd Lukman
Format:	Article
Language:	English English English
Published:	American Institute of Physics Inc. 2016
Subjects:	QC Physics TK2896 Production of electricity by direct energy conversion TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices
Online Access:	http://irep.iium.edu.my/53677/ http://irep.iium.edu.my/53677/ http://irep.iium.edu.my/53677/ http://irep.iium.edu.my/53677/1/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells.pdf http://irep.iium.edu.my/53677/2/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells_Scopus.pdf http://irep.iium.edu.my/53677/3/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells_WOS.pdf

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spelling	iium-536772017-10-20T22:36:37Z http://irep.iium.edu.my/53677/ Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells Inche Ibrahim, Mohd Lukman QC Physics TK2896 Production of electricity by direct energy conversion TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices The dissociation of polaron pairs into free charge carriers in organic bulk heterojunction solar cells is a fundamental step in generating photocurrent and is still in debate. In this study, we propose two simple criteria that can be used to test the validity of any polaron pair dissociation model for polymer-fullerene bulk heterojunction solar cells. The first criterion states that the ratio of the bimolecular recombination current density to the maximum photocurrent density should increase as a function of applied voltage. The second criterion states that the ratio of the bimolecular recombination current density to the maximum photocurrent density at short circuit should not be larger than 1. We apply these criteria to test the validity of the widely used Onsager-Braun model by using the experimental current-voltage data of poly[2-methoxy-5-(30-70-dimethyloctyloxy)-p-phenylene vinylene] (OC1C10-PPV) and [6,6]-phenyl C61-butyric acid methylester (PCBM) based solar cells. We find that our numerical analysis is not suitable to employ these criteria. Our analytical analysis, on the other hand, clearly demonstrates that the Onsager-Braun model simply cannot fulfill the first criteria. The reason is because the polaron pair dissociation given by the Onsager-Braun model is too strongly influenced by the electric field (i.e., decreases too rapidly as the electric field decreases). The analysis provides a further evidence against the widely used Onsager- Braun model. The proposed criteria can help us to determine the correct model for polaron pair dissociation by serving as a guideline on how strongly the electric field is allowed to influence the polaron pair dissociation. American Institute of Physics Inc. 2016-04-19 Article PeerReviewed application/pdf en http://irep.iium.edu.my/53677/1/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells.pdf application/pdf en http://irep.iium.edu.my/53677/2/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells_Scopus.pdf application/pdf en http://irep.iium.edu.my/53677/3/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells_WOS.pdf Inche Ibrahim, Mohd Lukman (2016) Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells. Journal of Applied Physics, 19 (15). pp. 1-8. ISSN 0021-8979 E-ISSN 1089-7550 http://aip.scitation.org/doi/abs/10.1063/1.4946038?journalCode=jap 10.1063/1.4946038
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English English English
topic	QC Physics TK2896 Production of electricity by direct energy conversion TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices
spellingShingle	QC Physics TK2896 Production of electricity by direct energy conversion TK7800 Electronics. Computer engineering. Computer hardware. Photoelectronic devices Inche Ibrahim, Mohd Lukman Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
description	The dissociation of polaron pairs into free charge carriers in organic bulk heterojunction solar cells is a fundamental step in generating photocurrent and is still in debate. In this study, we propose two simple criteria that can be used to test the validity of any polaron pair dissociation model for polymer-fullerene bulk heterojunction solar cells. The first criterion states that the ratio of the bimolecular recombination current density to the maximum photocurrent density should increase as a function of applied voltage. The second criterion states that the ratio of the bimolecular recombination current density to the maximum photocurrent density at short circuit should not be larger than 1. We apply these criteria to test the validity of the widely used Onsager-Braun model by using the experimental current-voltage data of poly[2-methoxy-5-(30-70-dimethyloctyloxy)-p-phenylene vinylene] (OC1C10-PPV) and [6,6]-phenyl C61-butyric acid methylester (PCBM) based solar cells. We find that our numerical analysis is not suitable to employ these criteria. Our analytical analysis, on the other hand, clearly demonstrates that the Onsager-Braun model simply cannot fulfill the first criteria. The reason is because the polaron pair dissociation given by the Onsager-Braun model is too strongly influenced by the electric field (i.e., decreases too rapidly as the electric field decreases). The analysis provides a further evidence against the widely used Onsager- Braun model. The proposed criteria can help us to determine the correct model for polaron pair dissociation by serving as a guideline on how strongly the electric field is allowed to influence the polaron pair dissociation.
format	Article
author	Inche Ibrahim, Mohd Lukman
author_facet	Inche Ibrahim, Mohd Lukman
author_sort	Inche Ibrahim, Mohd Lukman
title	Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
title_short	Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
title_full	Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
title_fullStr	Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
title_full_unstemmed	Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
title_sort	criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells
publisher	American Institute of Physics Inc.
publishDate	2016
url	http://irep.iium.edu.my/53677/ http://irep.iium.edu.my/53677/ http://irep.iium.edu.my/53677/ http://irep.iium.edu.my/53677/1/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells.pdf http://irep.iium.edu.my/53677/2/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells_Scopus.pdf http://irep.iium.edu.my/53677/3/53677_Criteria%20for%20validating%20polaron%20pair%20dissociation%20in%20polymer-fullerene%20bulk%20heterojunction%20solar%20cells_WOS.pdf
first_indexed	2023-09-18T21:15:55Z
last_indexed	2023-09-18T21:15:55Z
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Criteria for validating polaron pair dissociation in polymer-fullerene bulk heterojunction solar cells

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