A Solution‐Processed Small‐Molecule Diketopyrrolopyrrole Dimer for Organic Solar Cells. Issue 9 (26th June 2014)

• Record Type: Journal Article
• Authors: Niu, Zhixiao; Wang, Xue; Huang, Jianhua; Tang, Ailing; Sun, Yuxi; Zhan, Chuanlang
• Is Part Of: Asian journal of organic chemistry. Volume 3:Issue 9(2014:Sep.)
• Page Start: 948
• Page End: 952
• Publication Date: 2014-06-26
• Subjects: Chemistry, Organic -- Periodicals; Organic compounds -- Synthesis -- Periodicals; 547.005
• DOI: 10.1002/ajoc.201402048
• Languages: English
• ISSNs: 2193-5807

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>An easily‐accessible, solution‐processed diketopyrrolopyrrole (DPP) dimer, namely BDT(TDPP)₂, with benzodithiophene (BDT)‐thiophene (T) as the conjugated bridge unit was synthesized. The UV/vis absorption spectrum of the DPP dimer is broad and covers 350–740 nm, and the HOMO and LUMO energies are estimated to be −5.21 eV and −3.54 eV, respectively, by electrochemistry tests, which match well with the energy levels of [6, 6]‐phenyl‐C₇₁‐butyric acid methyl ester (PC₇₁BM). Solution‐processed, small‐molecule solar cells were prepared with BDT(TDPP)₂ as the donor material and PC₇₁BM as the acceptor material. With chloroform used as the processing solvent, the high boiling‐point solvent 1, 8‐diiodooctane (DIO) was used as the co‐solvent. Through screening the donor/acceptor ratios (1:1) and the DIO content (0.2 % (v/v)), the best device afforded a power conversion efficiency of 3.90 %, with a short‐circuit current density (<italic>J</italic>_sc) of 9.85 mA cm⁻², an open‐circuit voltage (<italic>V</italic>_oc) of 0.71 V, and an fill factor of 0.57.</p> </abstract>