谌宁副教授、李晓虹副教授、周祎副教授与德国埃尔朗根—纽伦堡大学Ning Li教授合作在J. Mater. Chem. A 上发表研究论文

Towards a full understanding of regioisomer effects of indene-C₆₀ bisadduct acceptors in bulk heterojunction polymer solar cells

Tiantian Cao ^a,  Ning Chen*^a（谌宁）,  Guangxin Liu ^a,  Yingbo Wan ^b , José Darío Perea ^c,  Yijun Xia ^b,  Zhaowei Wang ^a,  Bo Song ^b,  Ning Li*^c,  Xiaohong Li*^b（李晓虹）,  Yi Zhou*^a（周祎） , Christoph J. Brabec^cd  and  Yongfang Li^a

^a Laboratory of Advanced Optoelectronic Materials, College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

^b Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

^c Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander University Erlangen-Nürnberg, Martensstraße 7, 91058 Erlangen, Germany

^d Bavarian Center for Applied Energy Research (ZAE Bayern), Haberstraße 2a, Erlangen, Germany

J. Mater. Chem. A, 2017,5, 10206--10219

Indene-C₆₀ bisadduct (IC₆₀BA), which can offer a significantly higher open-circuit voltage (V_oc) than monoadducts, has become the research focus as electron acceptor materials in polymer solar cells (PSCs) in recent years. However, despite its popularity, IC₆₀BA have always been applied in PSCs as mixture of several regioisomers and the nature of this mixture has never been fully investigated and understood. Herein, for the first time, 12 major regioisomers of IC₆₀BA were isolated and a full investigation was carried out with respect to their structure, abundance, solubility and their corresponding photovoltaic performance. The results show that the PSCs based on these regioisomeric structures present very diverse PCE and their photovoltaic performance was dramatically affected not only by the relative indene positions but also by the steric orientation of the two indene groups. Electrochemical studies further revealed that the effect of energetic disorder inside the IC₆₀BA regioisomers on their photovoltaic performance is insignificant when applied in PSCs. However, the steric structures and solubility of the regioisomers were found to have significant impact on the morphology and bulk properties of the active layer of PSCs, which give rise to very different PCE of devices based on IC₆₀BA regioisomers with different structures.

链接：http://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C7TA01665D#!divAbstract