Samenvatting
Polymer solar cells based on PDPP5T and PCBM as donor and acceptor materials, respectively, were processed from aqueous nanoparticle dispersions. Careful monitoring and optimization of the concentration of free and surface-bound surfactants in the dispersion, by measuring the conductivity and ζ-potential, is essential to avoid aggregation of nanoparticles at low concentration and dewetting of the film at high concentration. The surfactant concentration is crucial for creating reproducible processing conditions that aid in further developing aqueous nanoparticle processed solar cells. In addition, the effects of adding ethanol, of aging the dispersion, and of replacing [60]PCBM with [70]PCBM to enhance light absorption were studied. The highest power conversion efficiencies (PCEs) obtained are 2.0% for [60]PCBM and 2.4% for [70]PCBM-based devices. These PCEs are limited by bimolecular recombination of photogenerated charges. Cryo-TEM reveals that the two components phase separate in the nanoparticles, forming a PCBM-rich core and a PDPP5T-rich shell and causing a nonoptimal film morphology.
| Originele taal-2 | Engels |
|---|---|
| Pagina's (van-tot) | 13380-13389 |
| Aantal pagina's | 10 |
| Tijdschrift | ACS Applied Materials & Interfaces |
| Volume | 9 |
| Nummer van het tijdschrift | 15 |
| DOI's | |
| Status | Gepubliceerd - 19 apr. 2017 |
Financiering
This research is supported by the Dutch Technology Foundation STW, which is part of The Netherlands Organisation for Scientific Research (NWO) and which is partly funded by the Ministry of Economic Affairs (Project 13513). The research leading to these results also received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement 339031) and from the Ministry of Education, Culture and Science (Gravity Program 024.001.035).