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  • Controlling surface enrichment in polymeric hole extraction layers to achieve high-efficiency organic photovoltaic cells.

Controlling surface enrichment in polymeric hole extraction layers to achieve high-efficiency organic photovoltaic cells.

ChemSusChem (2012-09-05)
Dong-Hun Kim, Kyung-Geun Lim, Jong Hyeok Park, Tae-Woo Lee
PMID22945400
ABSTRACT

Hole extraction in organic photovoltaic cells (OPVs) can be modulated by a surface-enriched layer formed on top of the conducting polymer-based hole extraction layer (HEL). This tunes the surface work function of the HEL to better align with the ionization potential of the polymeric photoactive layer. Results show noticeable improvement in device power conversion efficiencies (PCEs) in OPVs. We achieved a 6.1 % PCE from the OPV by optimizing the surface-enriched layer.

MATERIALS
Product Number
Brand
Product Description
561223
Sigma-Aldrich
Poly(4-styrenesulfonic acid) solution, Mw ~75,000, 18 wt. % in H2O
527483
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate) solution, average Mw ~70,000, 30 wt. % in H2O
527491
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate) solution, average Mw ~1,000,000, 25 wt. % in H2O
434574
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate), average Mw ~1,000,000, powder
243051
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate), average Mw ~70,000
561967
Sigma-Aldrich
Poly(sodium 4-styrenesulfonate) solution, average Mw ~200,000, 30 wt. % in H2O