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A Thermally and Mechanically Stable Solar Cell Made of a Small-Molecule Donor and Polymer Acceptor

Abstract

We explored systematic experiments based on small molecule donor and polymer acceptor containing the naphthalene diimide (NDI)-based polymer as compared with the fullerene-based acceptor (PC71BM) solar cells. Among polymer acceptors, NDI-based polymer (PNDI-2T) show good properties such as broad light absorbance with strong absorption co-efficient and well oriented crystalline structures leading to high electron mobility. We monitored the photovoltaic properties both PNDI-T2 and PC71BM acceptor with BDT2TR donor. Although BDT2TR:PC71BM device showed the higher PCE of 8.20%, BDT2TR:PNDT-2T device also showed remarkable photovoltaic result with PCE of 4.43% bearing a VOC = 0.86 V, JSC = 7.26 mA/cm2, and FF = 71% indicating one of the highest efficiency in small molecule donor and non-fullerene polymer acceptor systems. In addition, the PNDI-2T has excellent property such as thermal and mechanical stability than PC71BM acceptor. To consider these potential, we tested the thermal stability, thickness tolerance, and flexibility of photo-active layers. Interestingly, BDT2TR:PNDI-2T showed good thermal stability (15 h, 150 oC), retained PCE at thicker device (~610 nm) than PC71BM (~360 nm), and estimated more sufficient flexible blending system. As a result, the BDT2TR:PNDT-T2 device has potential for applicable flexible and potable energy generators.

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Publication details

The article was received on 22 May 2017, accepted on 03 Jul 2017 and first published on 05 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA04445C
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A Thermally and Mechanically Stable Solar Cell Made of a Small-Molecule Donor and Polymer Acceptor

    S. Oh, S. Badgujar, D. H. Kim, W. Lee, N. Khan, M. Jahandar, S. RASOOL, C. E. Song, H. K. Lee, W. S. Shin, J. Lee, S. Moon and S. K. Lee, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA04445C

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