| 研究実績の概要 |
The following results and publications have been achieved during the 2nd year of the research grant period:
1/ Using a polymer developped by RIKEN-CEMS (PNTz4T), we fabricated inverted polymer solar cells with a record PCE of 10.1%. Furthermore, the polymer crystallite orientation and their vertical distribution plays a key role to select the device architecture appropriate for high performance device fabrication (Nature Photonics, 2015)
2/ Comparing various fullerene derivative electron acceptors, we demonstrated that the PNTz4T:PC71BM combination is the most appropriate for active layer materials as they have complimentary absorptions and leads to balanced charge extraction (Book Chapter)
3/ A study of the effect of P3HT crystallinity in P3HT:PCBM diffusive bilayer regular architecture solar cells was conducted confirming that the generation of a vertical donor-acceptor concentration gradient plays a key role to increase the PCEs of organic solar cells (Applied Physics Express, 2016)
4/ We fabricated multilayer inverted solar cells through a stamping process to generate concentration gradients within the active layer which exhibit a 65% increase in PCE compared to the spin-coated devices. Using a thermodynamic approach we could predict the ideal conditions to deposit the active layers on the PDMS and transfer them to the bottom electrode substrates. For efficient deposition and transfer, it is necessary to deposit a PEDOT:PSS layer on PDMS prior to the active layer. Both layers are transferred to a PCBM covered substrate at 150 degrees celsius (manuscript under review)
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