2015 Fiscal Year Annual Research Report
Innovative architectures to simultaneously enhance organic photovoltaic device stability and efficiency
| Project/Area Number |
26889029
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
Vohra Varun 電気通信大学, 情報理工学(系)研究科, 助教 (10731713)
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| Project Period (FY) |
2014-08-29 – 2016-03-31
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| Keywords | 有機太陽電池 |
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| Outline of Annual Research Achievements |
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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| Research Progress Status |
27年度が最終年度であるため、記入しない。
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| Strategy for Future Research Activity |
27年度が最終年度であるため、記入しない。
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| Remarks |
Although perfect conditions for the device fabrication could not be obtained, the objectives of the research were partially achieved. The necessary follow-up projects are under investigation.
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