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Title: Charge-carrier generation in organic solar cells using crystalline donor polymers.
Authors: Tamai, Yasunari  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-3074-0208 (unconfirmed)
Tsuda, Kazuki
Ohkita, Hideo  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0002-7403-3492 (unconfirmed)
Benten, Hiroaki
Ito, Shinzaburo  kyouindb  KAKEN_id
Author's alias: 大北, 英生
Issue Date: 19-Jun-2014
Publisher: Royal Society of Chemistry
Journal title: Physical chemistry chemical physics
Volume: 16
Issue: 38
Start page: 20338
End page: 20346
Abstract: Charge generation and recombination dynamics in a blend film of a crystalline low-bandgap polymer, poly[(4, 4-bis(2-ethylhexyl)dithieno[3, 2-b:2', 3'-d]silole)-2, 6-diyl-alt-(4, 7-bis(2-thienyl)-2, 1, 3-benzothiadiazole)-4, 7-diyl] (PSBTBT), and [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM) were studied by transient absorption spectroscopy. Upon photoexcitation of the PSBTBT absorption band at 800 nm, singlet excitons were promptly generated, and then rapidly converted into polarons in a few picoseconds. We found that there are two different polarons in PSBTBT: one is ascribed to polarons generated in the disorder phase and the other is ascribed to polarons in the crystalline phase. On a time scale of nanoseconds, ∼50% of polarons in the disorder phase recombined geminately to the ground state. On the other hand, such geminate recombination was negligible for polarons in the crystalline phase. As a result, the overall charge dissociation efficiency is as high as ∼75% for PSBTBT/PCBM blend films. On the basis of these analyses, we discuss the role of polymer crystallinity in the charge-carrier generation in organic solar cells.
Rights: This journal is © the Owner Societies 2014.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。This is not the published version. Please cite only the published version.
URI: http://hdl.handle.net/2433/200182
DOI(Published Version): 10.1039/c4cp01820f
PubMed ID: 24980903
Appears in Collections:Journal Articles

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