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Title: A work-function tunable polyelectrolyte complex (PEI:PSS) as a cathode interfacial layer for inverted organic solar cells
Authors: Lin, Z.
Chang, J.
Zhang, J.
Jiang, C.
Wu, J. 
Zhu, C. 
Issue Date: 7-Jun-2014
Citation: Lin, Z., Chang, J., Zhang, J., Jiang, C., Wu, J., Zhu, C. (2014-06-07). A work-function tunable polyelectrolyte complex (PEI:PSS) as a cathode interfacial layer for inverted organic solar cells. Journal of Materials Chemistry A 2 (21) : 7788-7794. ScholarBank@NUS Repository.
Abstract: 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 TiO x, 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 TiO x-PEI:PSS interfacial layers demonstrate a promising cathode configuration for realizing efficient and long lifetime PSCs. This journal is © the Partner Organisations 2014.
Source Title: Journal of Materials Chemistry A
ISSN: 20507496
DOI: 10.1039/c4ta00289j
Appears in Collections:Staff Publications

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