Fullerene mixtures enhance the thermal stability of a non-crystalline polymer solar cell blend

Printing of polymer:fullerene solar cells at high speed requires annealing at temperatures up to 140 C. However, bulk-heterojunction blends that comprise a non-crystalline donor polymer often suffer from insufficient thermal stability and hence rapidly coarsen upon annealing above the glass transition temperature of the blend. In addition, micrometer-sized fullerene crystals grow, which are detrimental for the solar cell performance. In this manuscript, we present a strategy to limit fullerene crystallization, which is based on the use of fullerene mixtures of the two most common derivatives, PC61BM and PC71BM, as the acceptor material. Blends of this fullerene mixture and a non-crystalline thiophene-quinoxaline copolymer display considerably enhanced thermal stability and largely retain their photovoltaic performance upon annealing at elevated temperatures as high as 170 C.

[1]  P. M. Kristiansen,et al.  Fullerene Nucleating Agents: A Route Towards Thermally Stable Photovoltaic Blends , 2014 .

[2]  O. Inganäs,et al.  Sub-glass transition annealing enhances polymer solar cell performance , 2014 .

[3]  Ergang Wang,et al.  Facile Monitoring of Fullerene Crystallization in Polymer Solar Cell Blends by UV–vis Spectroscopy , 2014 .

[4]  Yu-Shan Cheng,et al.  Fullerene Derivative‐Doped Zinc Oxide Nanofilm as the Cathode of Inverted Polymer Solar Cells with Low‐Bandgap Polymer (PTB7‐Th) for High Performance , 2013, Advanced materials.

[5]  Y. Matsuo,et al.  Mixture of [60] and [70]PCBM giving morphological stability in organic solar cells , 2013 .

[6]  W. Su,et al.  Mechanism and control of the structural evolution of a polymer solar cell from a bulk heterojunction to a thermally unstable hierarchical structure. , 2013, Nanoscale.

[7]  O. Inganäs,et al.  Conformational Disorder Enhances Solubility and Photovoltaic Performance of a Thiophene–Quinoxaline Copolymer , 2013 .

[8]  Ergang Wang,et al.  Nucleation-limited fullerene crystallisation in a polymer-fullerene bulk-heterojunction blend† , 2013 .

[9]  Changduk Yang,et al.  High-efficiency polymer solar cells with a cost-effective quinoxaline polymer through nanoscale morphology control induced by practical processing additives , 2013 .

[10]  J. J. Richards,et al.  Modification of PCBM Crystallization via Incorporation of C60 in Polymer/Fullerene Solar Cells , 2013 .

[11]  O. Inganäs,et al.  Mixed C60/C70 based fullerene acceptors in polymer bulk-heterojunction solar cells , 2012 .

[12]  P. Heremans,et al.  New quinoxaline and pyridopyrazine-based polymers for solution-processable photovoltaics , 2012 .

[13]  Miao Xu,et al.  Enhanced power-conversion efficiency in polymer solar cells using an inverted device structure , 2012, Nature Photonics.

[14]  Hung-Wei Liu,et al.  Fullerene bisadduct as an effective phase-separation inhibitor in preparing poly(3-hexylthiophene)–[6,6]-phenyl-C61-butyric acid methyl ester blends with highly stable morphology , 2012 .

[15]  Suren A. Gevorgyan,et al.  Stability of Polymer Solar Cells , 2012, Advanced materials.

[16]  O. Inganäs,et al.  Phase behaviour of liquid-crystalline polymer/fullerene organic photovoltaic blends: thermal stability and miscibility , 2011 .

[17]  N. I. Alekseev,et al.  Extraction of fullerene mixture from fullerene soot with organic solvents , 2011 .

[18]  O. Inganäs,et al.  An Easily Synthesized Blue Polymer for High‐Performance Polymer Solar Cells , 2010, Advanced materials.

[19]  Jan D'Haen,et al.  Modeling the temperature induced degradation kinetics of the short circuit current in organic bulk heterojunction solar cells , 2010 .

[20]  Etienne Goovaerts,et al.  Effect of temperature on the morphological and photovoltaic stability of bulk heterojunction polymer: fullerene solar cells , 2008 .

[21]  Annalisa Bonfiglio,et al.  Influence of thermal ageing on the stability of polymer bulk heterojunction solar cells , 2007 .

[22]  Xiaoniu Yang,et al.  Morphology and Thermal Stability of the Active Layer in Poly(p-phenylenevinylene)/Methanofullerene Plastic Photovoltaic Devices , 2004 .

[23]  R. Ruoff,et al.  SELECTIVE AND HIGH-YIELD SYNTHESIS OF HIGHER FULLERENES , 1995 .