期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 37, 页码 18225-18233出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta06860g
关键词
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资金
- Engineering and Physical Sciences Research Council
- Science and Technology Facilities Council [RB1800095]
- China Scholarship Council [201503170255]
- SPIE Optics and Photonics Education Scholarship
- NSFC [91633301]
- MOST of China [2014CB643502]
- [2016-02051]
- EPSRC [1829348, EP/M005143/1] Funding Source: UKRI
Non-fullerene acceptors (NFAs) have recently outperformed their fullerene counterparts in binary bulk-heterojunction (BHJ) organic solar cells (OSCs). Further development of NFA OSCs may benefit other novel OSC device structures that alter or extend the standard BHJ concept. Here, we report such a new processing route that forms a BHJ-like morphology between sequentially processed polymer donor and NFA with high power conversion efficiencies in excess of 10%. Both devices show similar charge generation and recombination behaviours, supporting formation of similar BHJ active layers. We correlate the approximate to 30 meV smaller open-circuit voltage in sq-BHJ devices to more substantial non-radiative recombination by voltage loss analysis. We also determine the exciton diffusion length of benchmark polymer PBDB-T to be 10 +/- 3 nm. Our results demonstrate high-efficiency OSC devices using sequential deposition method and provide new opportunities to further improve performance of state-of-the-art OSCs.
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