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Journal of Photonics for Energy

Synthesis and photovoltaic response of a solution-processable dithienyldiketopyrrolopyrrole-based molecular semiconductor with thienylvinylthienyl endgroups
Author(s): Chun-Hui Zhang; Wan-Yi Tan; Li-Ping Wang; Qing-Duan Li; Rui Zhou; Ju Huang; Xin-Feng Wei; Yan Xia; Yi-Feng He; Xu-Hui Zhu; Junbiao Peng; Yong Cao
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Paper Abstract

We describe the synthesis and preliminary photovoltaic performance of a solution-processable organic small-molecule electron donor DT-DPP(TVT)2 that consists of dithienyldiketopyrrolopyrrole (DT-DPP) as the core and thienylvinylthiophene (TVT) as the endgroups. The new compound is a crystalline solid with a Tm of approximately 216°C. Cyclic voltammetry indicates that DT-DPP(TVT)2 exhibits two quasi-reversible one-electron oxidation waves at ca. 0.68 and 0.90 V versus an Ag/AgCl reference electrode, respectively, leading to an estimated highest occupied molecular orbital (HOMO) level of about −5.08  eV. Introducing the branched 2-hexyldecyl side chain provides DT-DPP(TVT)2 with a high solubility in chloroform up to ca. 36  mg mL−1 at room temperature. Thermal annealing increases the crystallinity of the as-cast film from chloroform solution, thereby rendering slightly red-shifted charge-transfer absorption maxima. Fitting the space-charge-limited current characteristics of the thermally annealed thin film yields an improved hole mobility of ∼2.14×10−4  cm2 V−1 s−1 at low voltages versus ∼1.46×10−4  cm2 V−1s−1 of the as-cast film. A first characterization of the solar cell [ITO/PEDOT: PSS/DT-DPP(TVT)2: PC61BM/Al] produces a power conversion efficiency of ∼3% with VOC0.78  V, JSC7.91  mA cm−2, and FF48.7%, under simulated AM1.5G with an illumination intensity of 100  mW cm−2. It should be noted that the thermal effect on the thin film absorption of DT-DPP(TVT)2 does not seem to be completely similar to the molecular donor DPP(TFNa)2 reported earlier, which bears 6-fluoronaphthyl endgroups.

Paper Details

Date Published: 28 January 2015
PDF: 12 pages
J. Photon. Energy. 5(1) 057211 doi: 10.1117/1.JPE.5.057211
Published in: Journal of Photonics for Energy Volume 5, Issue 1
Show Author Affiliations
Chun-Hui Zhang, South China Univ. of Technology (China)
Wan-Yi Tan, South China Univ. of Technology (China)
Li-Ping Wang, South China Univ. of Technology (China)
Qing-Duan Li, South China Univ. of Technology (China)
Rui Zhou, South China Univ. of Technology (China)
Ju Huang, South China Univ. of Technology (China)
Xin-Feng Wei, South China Univ. of Technology (China)
Yan Xia, South China Univ. of Technology (China)
Yi-Feng He, South China Univ. of Technology (China)
Xu-Hui Zhu, South China Univ. of Technology (China)
Junbiao Peng, South China Univ. of Technology (China)
Yong Cao, South China Univ. of Technology (China)


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