Optimized inverted polymer solar cells incorporating Cs2CO3-doped C60 as electron transport layer

Anthony Barbot (1) , Bruno Lucas (1) , Catherine Di Bin (1) , Bernard Ratier (1) , Matt Aldissi (1)

1 XLIM-MINACOM - MINACOM

An efficient charge transfer between co-sublimed cesium carbonate (Cs2CO3) and fullerene C60 provides an n-type material exhibiting an electrical conductivity above 1 S/cm. This type of doped layers can be used in organic optoelectronic devices to reduce ohmic losses at organic-electrode interfaces. We report here an analysis of inverted polymer-based solar cells incorporating Cs2CO3 doped C60 as electron transport layer (ETL). The optimization of both dopant concentration and thickness resulted in a maximum efficiency of 3.79% compared to 3% for similar devices using undoped C60 as ETL and 2.13% for devices without any ETL.

Mots clés: cesium compounds; charge transfer states; conducting polymers; doping profiles; electrical conductivity; fullerenes organic semiconductors; solar cells

Anthony Barbot, Bruno Lucas, Catherine Di Bin, Bernard Ratier, Matt Aldissi. Optimized inverted polymer solar cells incorporating Cs2CO3-doped C60 as electron transport layer. Applied Physics Letters, 2013, 102 (19), pp.193305 - 193305-3. ⟨10.1063/1.4807388⟩. ⟨hal-00934909⟩