期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 40, 页码 23211-23220出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b06064
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资金
- German Research Foundation (DFG) [SPP 1355]
- Baden-Wurttemberg Stiftung in the program Organic Photovoltaics and Dye Sensitized Solar Cells
- Carl-Zeiss-Stiftung
- HYMEC
Small-molecule organic photovoltaic cells often employ a planar heterojunction (PHJ) geometry where the electron donor and acceptor materials are stacked one on top of the other. The thin-film growth scenario of such PHJs can be very different from the one of a single compound on a bare substrate. We have investigated the growth of PHJs, consisting of two different donor acceptor pairs, namely, alpha-serithiophene (6T)/C-60 and 6T/diindenoperylene (DIP) using real-time in situ X-ray scattering. For both donor acceptor material combinations, we observe that the coherent in-plane crystalline size of the second material strongly correlates with the one of the bottom one, and hence a strong templating effect of the 6T on the material deposited subsequently, indicating a strong interaction between the two materials in the PHJ. Furthermore, a change in the structure of the 6T film during the deposition of the second material was observed, which shows that the deposition of an additional material on top of a templating layer can partially change the crystal structure of the templating film itself.
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