PC70BM is a fullerene electron acceptor commonly used in the most efficient organic photovoltaic devices. The non-symmetrical C70 cage of PC70BM enables energetic transitions that are forbidden in C60, improving the absorption characteristics over PC60BM for the visible range of the solar spectrum . This allows increased photon harvesting, and a potentially higher photocurrent for devices using PC70BM rather than PC60BM. The 95% purity PC70BM is recommended for general applications, and has produced power conversion efficiencies of over 9% in our own laboratories when mixed with a low bandgap polymeric donor, while the 99% PC70BM is recommended where ultimate performance is required.
The energy levels and good electron mobility of PC70BM enable it to be used as an electron transport layer in perovskite solar cells. In our laboratories, we have achieved a PCE approaching 12% using PC70BM in CH3NH3PbI3-xClx perovskite solar cells (more details can be found in fabrication guide).
|Full name||[6,6]-Phenyl-C71-butyric acid methyl ester|
|Synonyms||C70 PCBM, PC71BM, PCBM|
|HOMO / LUMO||HOMO = -5.9 eV, LUMO = -3.9 eV|
|Molecular weight||1031 g/mol|
|Classification / Family||
Fullerenes, Organic semiconducting materials, Organic Photovoltaics, Polymer Solar Cells, Perovskite Solar cells, Electron transport layer materials
The percentages in the table below represent the ratio of PC70BM to PC60BM in the product (i.e. 95% PC70BM with 5% PC60BM).
Literature and Reviews
- Influence of PC60BM or PC70BM as electron acceptor on the performance of polymer solar cells, F. Zhang et al., Sol. Energy Mater. Sol. Cells, 97 (2012), 71–77; DOI: 10.1016/j.solmat.2011.09.006.
- Efficient planar heterojunction mixed-halide perovskite solar cells deposited via spray-deposition, A. T. Barrows et al., Energy Environ. Sci., 7 (2014), 2944–2950; DOI: 10.1039/C4EE01546K.
To the best of our knowledge the technical information provided here is accurate. However, Ossila assume no liability for the accuracy of this information. The values provided here are typical at the time of manufacture and may vary over time and from batch to batch.