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Article: Charge dynamics in solar cells with a blend of π-conjugated polymer-fullerene studied by transient photo-generated voltage

TitleCharge dynamics in solar cells with a blend of π-conjugated polymer-fullerene studied by transient photo-generated voltage
Authors
Issue Date2012
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/pccp
Citation
Physical Chemistry Chemical Physics, 2012, v. 14 n. 23, p. 8397-8402 How to Cite?
AbstractThe biphasic feature of transient photo-generated voltage (TPV) is investigated in organic solar cells (OSCs) with a blend active layer of poly(3-hexylthiophene) (P3HT) and phenyl C61 butyric acid methyl ester (PCBM). The positive and negative components in biphasic TPV are explained through PCBM only and P3HT only devices. The negative and positive components are ascribed to the dipole formation at the buried interface of P3HT/indium tin oxide (ITO) and PCBM/ITO respectively. Based on these findings, two fundamental phenomena are revealed as follows: (1) interfacial modification on the buried interface inverts the negative component in biphasic TPV to a positive component, which prevents the leakage current channel in the conventional OSC structure; and (2) the solvent chosen transforms the positive component in biphasic TPV into a negative signal, which blocks the leakage current channel in the inverted OSC structure. Consequently, the study of TPV polarity provides the justification of the interaction at the buried interface. Besides, the decay of TPV is found to be bi-exponential, which can be used as a tool to estimate the degree of charge balance in OSCs. © 2012 the Owner Societies.
Persistent Identifierhttp://hdl.handle.net/10722/155769
ISSN
2015 Impact Factor: 4.449
2015 SCImago Journal Rankings: 1.836
ISI Accession Number ID
Funding AgencyGrant Number
UGC of the University of Hong Kong10401466
Research Grants Council of Hong Kong Special Administrative Region, ChinaHKU 712010
Jiawei SolarChina, Co. Ltd.
Funding Information:

This work is supported by the UGC grant (#10401466) of the University of Hong Kong and the General Research Fund (HKU#712010) from the Research Grants Council of Hong Kong Special Administrative Region, China as well as the financial support from Jiawei SolarChina, Co. Ltd. We would like to thank Xiaoyuan Hou and Chee-Leung Mak for their useful discussion and Yiping Sun for her assistance in proofreading the manuscript.

References

 

DC FieldValueLanguage
dc.contributor.authorDing, BFen_US
dc.contributor.authorChoy, WCHen_US
dc.contributor.authorKwok, WMen_US
dc.contributor.authorWang, CDen_US
dc.contributor.authorHo, KYFen_US
dc.contributor.authorFung, DDSen_US
dc.contributor.authorXie, FXen_US
dc.date.accessioned2012-08-08T08:35:15Z-
dc.date.available2012-08-08T08:35:15Z-
dc.date.issued2012en_US
dc.identifier.citationPhysical Chemistry Chemical Physics, 2012, v. 14 n. 23, p. 8397-8402en_US
dc.identifier.issn1463-9076en_US
dc.identifier.urihttp://hdl.handle.net/10722/155769-
dc.description.abstractThe biphasic feature of transient photo-generated voltage (TPV) is investigated in organic solar cells (OSCs) with a blend active layer of poly(3-hexylthiophene) (P3HT) and phenyl C61 butyric acid methyl ester (PCBM). The positive and negative components in biphasic TPV are explained through PCBM only and P3HT only devices. The negative and positive components are ascribed to the dipole formation at the buried interface of P3HT/indium tin oxide (ITO) and PCBM/ITO respectively. Based on these findings, two fundamental phenomena are revealed as follows: (1) interfacial modification on the buried interface inverts the negative component in biphasic TPV to a positive component, which prevents the leakage current channel in the conventional OSC structure; and (2) the solvent chosen transforms the positive component in biphasic TPV into a negative signal, which blocks the leakage current channel in the inverted OSC structure. Consequently, the study of TPV polarity provides the justification of the interaction at the buried interface. Besides, the decay of TPV is found to be bi-exponential, which can be used as a tool to estimate the degree of charge balance in OSCs. © 2012 the Owner Societies.en_US
dc.languageengen_US
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/pccpen_US
dc.relation.ispartofPhysical Chemistry Chemical Physicsen_US
dc.titleCharge dynamics in solar cells with a blend of π-conjugated polymer-fullerene studied by transient photo-generated voltageen_US
dc.typeArticleen_US
dc.identifier.emailChoy, WCH:chchoy@eee.hku.hken_US
dc.identifier.authorityChoy, WCH=rp00218en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1039/c2cp40911aen_US
dc.identifier.scopuseid_2-s2.0-84862161042en_US
dc.identifier.hkuros207976-
dc.identifier.hkuros207981-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84862161042&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume14en_US
dc.identifier.issue23en_US
dc.identifier.spage8397en_US
dc.identifier.epage8402en_US
dc.identifier.isiWOS:000304353600019-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridDing, BF=16309026400en_US
dc.identifier.scopusauthoridChoy, WCH=7006202371en_US
dc.identifier.scopusauthoridKwok, WM=7103129332en_US
dc.identifier.scopusauthoridWang, CD=37113178400en_US
dc.identifier.scopusauthoridHo, KYF=36673077900en_US
dc.identifier.scopusauthoridFung, DDS=53163392700en_US
dc.identifier.scopusauthoridXie, FX=45961747700en_US

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