Journal
FRONTIERS IN CHEMISTRY
Volume 8, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fchem.2020.00302
Keywords
all-polymer solar cells; ternary solar cells; power conversion efficiency; thermal stability; Forster resonant energy transfer
Categories
Funding
- Ministry of Science and Technology [2019YFA0705900, 2017YFA0206600]
- National Natural Science Foundation of China [21875072, 21520102006]
- Fundamental Research Funds for Central Universities of South China University of Technology
- scientific research startup funds for high-level talents of Wuyi University [AL2019003]
- Natural Science Foundation of Guangdong Province [2019A1515110944, 2019A1515010848]
- Youth Innovation Talent Project for the Universities of Guangdong Province [2019KQNCX161]
- Aufbruch Bayern initiative of the state of Bavaria
- Bavarian Initiative Solar Technologies go Hybrid (SolTech)
- DFG [SFB 953, 182849149]
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All-polymer solar cells (all-PSCs) composed of polymer donors and acceptors have attracted widespread attention in recent years. However, the broad and efficient photon utilization of polymer:polymer blend films remains challenging. In our previous work, we developed NOE10, a linear oligoethylene oxide (OE) side-chain modified naphthalene diimide (NDI)-based polymer acceptor which exhibited a power conversion efficiency (PCE) of 8.1% when blended with a wide-bandgap polymer donor PBDT-TAZ. Herein, we report a ternary all-PSC strategy of incorporating a state-of-the-art narrow bandgap polymer (PTB7-Th) into the PBDT-TAZ:NOE10 binary system, which enables 8.5% PCEs within a broad ternary polymer ratio. We further demonstrate that, compared to the binary system, the improved photovoltaic performance of ternary all-PSCs benefits from the combined effect of enhanced photon absorption, more efficient charge generation, and balanced charge transport. Meanwhile, similar to the binary system, the ternary all-PSC also shows excellent thermal stability, maintaining 98% initial PCE after aging for 300 h at 65 degrees C. This work demonstrates that the introduction of a narrow-bandgap polymer as a third photoactive component into ternary all-PSCs is an effective strategy to realize highly efficient and stable all-PSCs.
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