Impact of Alkoxyl Tail of Fullerene Dyad Acceptor on Crystalline Microstructure for Efficient External Treatment-free Polymer Solar Cells with Poly(3-hexylthiophene) as Donor

doi:10.1007/s40242-015-5184-1

Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (5): 865-872.doi: 10.1007/s40242-015-5184-1

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Impact of Alkoxyl Tail of Fullerene Dyad Acceptor on Crystalline Microstructure for Efficient External Treatment-free Polymer Solar Cells with Poly(3-hexylthiophene) as Donor

XUE Rongming¹, ZHAO Yue¹, XU Guiying¹, LI Yaowen^1,2, LI Yongfang^1,3

1. Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China;
2. Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China;
3. Beijing National Laboratory for Molecular Sciences, Institution of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received:2015-05-08 Revised:2015-06-23 Online:2015-10-01 Published:2015-07-06
Contact: LI Yaowen, E-mail: ywli@suda.edu.cn E-mail:ywli@suda.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(Nos.21204057, 91333204), the Natural Science Foundation of Jiangsu Province, China(No.BK2012213), the Priority Academic Development Program of Jiangsu Higher Education Institutions, China and the Soochow University Undergraduate Training Program for Innovation and Entrepreneurship, China(No.2013XjOZO).

Abstract

Abstract:

A series of tri(alkoxyl)benzene-fullerene dyads(PCBB-Cn, n=4, 6, 8, 10, 12) with varied tri(alkoxyl) chain lengths was designed, synthesized and used as acceptor materials in polymer solar cells(PSCs). The five fullerene dyads possess similar absorption spectra in dilute solution, decreased glass-transition temperature(T_g) and gradually elevated lowest unoccupied molecular orbital(LUMO) energy levels from -3.87 eV to -3.73 eV with the increase of the alkoxy chain length. In the fabrication of PSCs with poly(3-hexylthiophene)(P3HT) as donor and the fullerene dyads as acceptor, PCBB-Cn with longer tri(alkoxyl) chains and lower T_g can induce crystalline structure of P3HT during spin-coating the photoactive layer at room temperature and form nanoscale phase separated interpenetrating network of P3HT:PCBB-Cn blend films, which results in the improvement of photovoltaic performance of PSCs. A power conversion efficiency of 3.03% for the PSCs based on P3HT:PCBB-C10 was obtained without thermal annealing or solvent annealing. The thermal and solvent annealing-free fabrication using the fullerene dyads as acceptor is very important for the roll to roll production of PSCs with flexible large area.

Key words: Polymer solar cell, Induced crystalline, Fullerene dyad

XUE Rongming, ZHAO Yue, XU Guiying, LI Yaowen, LI Yongfang. Impact of Alkoxyl Tail of Fullerene Dyad Acceptor on Crystalline Microstructure for Efficient External Treatment-free Polymer Solar Cells with Poly(3-hexylthiophene) as Donor[J]. Chemical Research in Chinese Universities, 2015, 31(5): 865-872.

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Impact of Alkoxyl Tail of Fullerene Dyad Acceptor on Crystalline Microstructure for Efficient External Treatment-free Polymer Solar Cells with Poly(3-hexylthiophene) as Donor

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