Issue 16, 2012
From the journal:

Journal of Materials Chemistry

Synthesis and applications of novel low bandgap star-burst molecules containing a triphenylamine core and dialkylated diketopyrrolopyrrole arms for organic photovoltaics

Duryodhan Sahu,a   Chia-Hua Tsai,a   Hung-Yu Wei,b   Kuo-Chuan Ho,b   Feng-Chih Changc  and  Chih-Wei Chu*ad  

* Corresponding authors

a Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan (ROC)
E-mail: gchu@gate.sinica.edu.tw
Fax: +886-2-2782-6680
Tel: +886-2-2789-8000 ext. 70

b Institute of Polymer Science & Engineering, National Taiwan University, Taipei, Taiwan

c Department of Applied Chemistry, National Chiao-Tung University, Hsinchu, Taiwan (ROC)

d Department of Photonics, National Chiao-Tung University, Hsinchu, Taiwan (ROC)

Abstract

In this study, we used facile synthetic routes to construct two well-defined starburst donor/acceptor conjugated small molecules with broad absorption features; in TPAKP-2 and TPAKP-3, triphenylamine (TPA) moieties served as electron donor core units and dialkylated diketopyrrolopyrrole (DKP) moieties with symmetrical thiophene units served as electron acceptors, in 1 : 2 and 1 : 3 ratios, respectively. Our investigation of the photophysical properties indicated that the absorption bands of TPAKP-2, and TPAKP-3 extended up to 793 nm, with low optical band gaps of 1.56 and 1.65 eV respectively. Under illumination with AM 1.5 white light (100 mW cm−2), we investigated the performance of bulk heterojunction (BHJ) photovoltaic devices incorporating an active layer of an electron-donor small molecule (TPAKP-2 or TPAKP-3) blended with an electron acceptor: [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) or [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) at various weight ratios. The photovoltaic device containing the donor TPAKP-3 and the acceptor PC71BM at a 1 : 3 weight ratio exhibited the best power conversion efficiency (1.81%), with an open circuit voltage of 0.66 V, a short circuit current density of 7.93 mA cm−2, and a fill factor of 34.7%.

Graphical abstract: Synthesis and applications of novel low bandgap star-burst molecules containing a triphenylamine core and dialkylated diketopyrrolopyrrole arms for organic photovoltaics

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Article information

DOI
https://doi.org/10.1039/C2JM16760C
Article type
Paper
Submitted
22 Dec 2011
Accepted
17 Feb 2012
First published
12 Mar 2012

J. Mater. Chem., 2012,22, 7945-7953

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Synthesis and applications of novel low bandgap star-burst molecules containing a triphenylamine core and dialkylated diketopyrrolopyrrole arms for organic photovoltaics

D. Sahu, C. Tsai, H. Wei, K. Ho, F. Chang and C. Chu, J. Mater. Chem., 2012, 22, 7945 DOI: 10.1039/C2JM16760C

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