Organic-inorganic Interfaces at Fullerene-based Solar Cells: Role of the Buffer Layers for Tunable Functionality

Organic-inorganic Interfaces at Fullerene-based Solar Cells: Role of the Buffer Layers for Tunable Functionality
organic solar cell; organic interlayer
Issue Date
2011 MRS(Materials Research Society) spring meeting and exhibit
The interface between photo-active layer and charge extraction layer is critically important for better design of the polymer-fullerene solar cell with improved power conversion efficiency. In this work, we have performed systematic experiments on the fabrication of hole and electron extraction layers, which provide a tunable electrical properties as well as affinity of specific materials in photo-active polymer-fullerene blends. By the precise control of thickness in the short-chain fluoropolymer (Aquivion, from Solvay Solexis) on top of the PEDOT:PSS, work function at the contact with positive electrode was systematically engineered, while the interface of fluoropolymer improves the ordering of poly(3-hexylthiophene):fullerene active layer. Optimized interfacial buffer layer thickness resulted in the increase of short circuit current and nominal power conversion efficiency more than 30% of control device (reference around 3.5%). Furthermore, we have investigated the role of self-assembled ultrathin buffer of alkylsilane materials with various functionalities at the interface with photoactive layer and charge collection layer. Both for small molecular [chloro(subphthalocyaninato) boron(III) (SubPc)-fullerene) and polymeric [poly(3-hexylthiophene)-fullerene] photoactive layers, correlation between the morphological ordering of active layer and the performance of photovoltaic devices were studied. Various factors affecting the rectification, open circuit voltage, and photocurrent of the devices are examined in relation with the chemical properties of surface characterized by XPS and TOF-SIMS. Our investigation and suggestion will be useful for an understanding of the related mechanism as well as the improved performance of organic solar cell devices.
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