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Green-solvent processable semiconducting polymers applicable in additives-free perovskite and polymer solar cells: molecular weights, photovoltaic performance, and thermal stability

Abstract

In this study, we demonstrate the effects of the molecular weight (MW) of a green-solvent processable semiconducting polymer (asy-PBTBDT) on its photovoltaic performance and device thermal stability in green processed devices for the first time. The asy-PBTBDT with the high MW (132 kDa) had the highest μh values (4.91 × 10−3 cm2 V−1 s−1 without dopants and 5.77 × 10−3 cm2 V−1 s−1 with dopants) as a result of increasing π-π stacking along with MW compared to low-MW asy-PBTBDTs (27 and 8 kDa). The high-MW asy-PBTBDT with high μh achieved the best power conversion efficiencies of 18.2% and 20.0% for the undoped and doped states in PerSCs, respectively, and of 5.7% in PSCs in green processed devices. Furthermore, the glass transition temperature increased with an increase in MW, thus indicating the effective decrease in heat-induced morphological degradation in the photovoltaic devices. In addition, increasing chain density along with MW led to good robustness against humidity and oxygen.

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Publication details

The article was received on 15 Jan 2018, accepted on 06 Feb 2018 and first published on 07 Feb 2018


Article type: Communication
DOI: 10.1039/C8TA00479J
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Green-solvent processable semiconducting polymers applicable in additives-free perovskite and polymer solar cells: molecular weights, photovoltaic performance, and thermal stability

    J. Lee, T. H. Lee, M. Malekshahi Byranvand, K. choi, H. I. Kim, S. A. Park, J. Y. Kim and T. Park, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA00479J

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