Journal
DYES AND PIGMENTS
Volume 125, Issue -, Pages 151-158Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2015.10.006
Keywords
Organic solar cells; Small molecules; Bulk-heterojunction; Diketopyrrolopyrrole; Pyrene; Rodanine
Funding
- Major Cultivation and General Programs of National Natural Science Foundation of China [51573154, 91233112, 21172187, 51403178]
- Program for Innovative Research Cultivation Team in University of Ministry of Education of China [1337304]
- Innovation Group in Hunan Natural Science Foundation [12JJ7002]
- Natural Science Foundation of Hunan [14JJ4019, 2015JJ3113]
- Open Project for the National Key Laboratory of Luminescent Materials and Devices [2014-skllmd-10]
- Research Foundation of Hunan Education Bureau [13A102, 14C1099]
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Four novel small molecules, Ph(DPP-Th)(2), Ph(DPP-Py)(2), Ph(DPP-ThCN)(2) and Ph(DPP-ThR)(2) were synthesized and characterized, in which diketopyrrolopyrrole-phenyl-diketopyrrolopyrrole was used as the core, donor units of 2-octylthiophene (Th), pyrene (Py), acceptor units octyl 2-cyano-3-(thiophen-2-yl)acrylate (ThCN) and 3-octyl-5-(thiophen-2-ylmethylene)rodanine (ThR) were used as the terminals, respectively. By changing the terminals of small molecules, their corresponding thermal, absorptive, electro-chemical and photovoltaic properties were rationally adjusted for applications as donor materials in organic solar cells (OSCs). All of small molecules exhibit broad absorption spectra from the visible to near-infrared region, and Ph(DPP-ThR)(2) showed the minimum optical band gap of 1.48 eV. The small molecules with acceptor terminal units had much deeper HOMO energy levels than those with donor terminal units, which is important to increase the open-circuit voltage (V-oc). A maximum power conversion efficiency of 3.22%, short-circuit current density of 10.55 mA cm(-2), V-oc of 0.85 V, and fill factor of 39% were obtained in the Ph(DPP-Py)(2)/PC71BM based cells under AM 1.5 G irradiation (100 mW cm(-1)). These results demonstrate valuable guidelines for the rational design of solution-processed small molecules for OSCs. (C) 2015 Elsevier Ltd. All rights reserved.
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