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Organic donor-sigma-acceptor molecules based on 1,2,4,5-tetrakis((E)-2-(5 '-hexyl-2,2 '-bithiophen-5-yl)vinyl)benzene and perylene diimide derivative and their application to photovoltaic devices

Authors
Kim, Myung HeeCho, Min JuKim, Kyung HwanHoang, Mai HaLee, Tae WanJin, Jung-IlKang, Nam SuYu, Jae-WoongChoi, Dong Hoon
Issue Date
Dec-2009
Publisher
ELSEVIER SCIENCE BV
Keywords
Donor; Acceptor; Crystallization; Semiconductor; Photovoltaic cell
Citation
ORGANIC ELECTRONICS, v.10, no.8, pp.1429 - 1441
Indexed
SCIE
SCOPUS
Journal Title
ORGANIC ELECTRONICS
Volume
10
Number
8
Start Page
1429
End Page
1441
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118796
DOI
10.1016/j.orgel.2009.08.004
ISSN
1566-1199
Abstract
Donor-sigma-acceptor molecules of HPBT-n(PDI) (n = 1, 2, and 4) containing perylene diimide (PDI) and pi-extended 1,2,4,5-tetrakis((E)-2-(5'-hexyl-2,2'-bithiophen-5-yl)vinyl)benzene (HPBT) have been successfully synthesized for studying the self-organization of each moiety and their applications in photovoltaic devices. Interesting features were found in these molecules: the aggregation-induced crystallization in the HPBT moieties enhanced the power conversion efficiency (PCE) in the photovoltaic cell. By incorporating HPBT as the donor and PDI as the acceptor moiety, we anticipated that their high degree of independent aggregation-induced crystallization would yield electron/hole transport channels and high mobility in the desired direction of charge transport. In a photovoltaic device, HPBT-1(PDI) gave a PCE of 0.22% with an open circuit voltage ranging from 0.62 to 0.63 V. When the HPBT moiety was more hindered by the PDI moiety, less PCE was observed in HPBT-2(PDI). Addition of methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) resulted in enhancement of the PCE due to enhanced visible absorption. The device bearing HPBT-1(PDI) and PCBM (1:4 mol ratio) demonstrate much higher PCE to be around 1.60%. (C) 2009 Elsevier B.V. All rights reserved.
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