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The Role of Chemical Structure in Indacenodithienothiophene-alt-Benzothiadiazole Copolymers for High Performance Organic Solar Cells With Improved Photo-Stability Through Minimization of Burn-in Loss

Abstract

It is of outmost importance to gain in depth understanding on the role of the polymer chemical structure in the corresponding organic solar cell (OSC) performance and degradation behavior that is insufficiently explored. Achieving these correlations it will set new design rules towards further optimization of polymer chemical structures for OSCs with high performances and long stability. In this study, our efforts have been focused to identify how the nature of aryl substituents and the number of fluorine atoms anchored in the backbone of indacenodithieno[3,2-b]thiophene (IDTT) based polymers influence their optoelectronic properties, the OSC performances and the degradation mechanisms. The most important outcome of this study is the demonstration that standard initial burn-in loss is primary attributed to microstructure instabilities. Furthermore, the initial burn-in loss could be substantially reduced through the rational design of the polymeric semiconductor’s chemical structure, leading to improved lifetimes and low (20%) initial power conversion efficiency loss. In particular, we identify the beneficial effect of the presence of the two fluorine atoms on the benzo[c][1,2,5]thiadiazole (BTD), as compared to the non-fluorinated and mono-fluorinated analogues, in decreasing the burn-in by reducing the microstructure instabilities regardless of the aryl substituent that is present in the polymer backbone.

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Publication details

The article was received on 19 Oct 2017, accepted on 13 Nov 2017 and first published on 14 Nov 2017


Article type: Paper
DOI: 10.1039/C7TA09224E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    The Role of Chemical Structure in Indacenodithienothiophene-alt-Benzothiadiazole Copolymers for High Performance Organic Solar Cells With Improved Photo-Stability Through Minimization of Burn-in Loss

    C. L. Chochos, N. Leclerc, N. Gasparini, N. Zimmermann, E. Tatsi, A. Katsouras, D. Moschovas, E. Serpetzoglou, I. Konidakis, S. Fall, P. Lévêque, T. Heiser, M. Spanos, V. G. Gregoriou, E. Stratakis, T. Ameri, C. J. Brabec and A. Avgeropoulos, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA09224E

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