期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 128, 期 -, 页码 119-125出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2014.05.017
关键词
Organic solar cells; Low band gap polymers; NEXAFS; Electronic structure; Orientation
资金
- German Research Council [DFG: CH 132/24-1]
- European Union [290022]
The molecular orientation of selected low band gap polymers for organic photovoltaics (Si-PCPDTBT, PCPDTBT, and PCPDTBBT) and the influence of PCBM on the orientation is studied using Near-Edge X-Ray Absorption Fine Structure spectroscopy (NEXAFS). The results are compared to the state of the art material P3HT. A clear angular dependence in the S-K NEXAFS spectra points to a preferred orientation of the pi-conjugated system and thus to a high degree of ordering for most materials. Generally, the degree of ordering decreases after blending the polymer with the fullerene PCBM. In the case of P3HT and PCPDTBT, the degree of ordering could be improved considerably due to the annealing of the film. The annealing temperatures depend however on the considered polymer. (C) 2014 Elsevier B.V. All rights reserved.
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