期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 21, 页码 7788-7794出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00289j
关键词
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资金
- MOE [MOE2011-T2-2-130]
- IMRE [IMRE/13-1C0208, IMRE/13-1C0205]
High-efficiency inverted polymer solar cells (PSCs) with a polyelectrolyte complex, polyethylenimine: poly(styrenesulfonate) (PEI:PSS), as the cathode interfacial layer for efficient electron extraction are demonstrated. By introducing the negatively charged PSS- as the counter ions into PEI, the imine protonation could be tuned, leading to tunable work-function of the PEI: PSS coated ITO. The incorporation of PSS in PEI enhances the photocurrent and power conversion efficiency (PCE) of the devices, due to an improved electron extraction at the PEI: PSS-active-layer interfaces. Furthermore, a TiOx-PEI: PSS combined interfacial layer further enhances the cell performance and eliminates the need for light-soaking treatment for TiOx, owing to the improved hole-blocking and surface-state passivation in the interfacial layer. The achieved high cell performance, better stability, low-cost materials, and low-temperature solution processes of the TiOx-PEI: PSS interfacial layers demonstrate a promising cathode configuration for realizing efficient and long lifetime PSCs.
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