Details

Autor(en) / Beteiligte

• Stubhan, Tobias
• Li, Ning
• Luechinger, Norman A.
• Halim, Samuel C.
• Matt, Gebhard J.
• Brabec, Christoph J.

Titel

High Fill Factor Polymer Solar Cells Incorporating a Low Temperature Solution Processed WO3 Hole Extraction Layer

Ist Teil von

• Advanced energy materials, 2012-12, Vol.2 (12), p.1433-1438

Ort / Verlag

Weinheim: WILEY-VCH Verlag

Erscheinungsjahr

2012

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• We demonstrate solution‐processed tungsten trioxide (WO3) incorporated as hole extraction layer (HEL) in polymer solar cells (PSCs) with active layers comprising either poly(3‐hexylthiophene) (P3HT) or poly[(4,4'‐bis(2‐ethylhexyl)dithieno[3,2‐b:2′,3′‐d]silole)‐2,6‐diyl‐alt‐(4,7‐bis(2‐thienyl)‐2,1,3‐benzothiadiazole)‐5,50‐diyl] (Si‐PCPDTBT) mixed with a fullerene derivative. The WO3 layers are deposited from an alcohol‐based, surfactant‐free nanoparticle solution. A short, low‐temperature (80 °C) annealing is sufficient to result in fully functional films without the need for an oxygen‐plasma treatment. This allows the application of the WO3 buffer layer in normal as well as inverted architecture solar cells. Normal architecture devices based on WO3 HELs show comparable performance to the PEDOT:PSS reference devices with slightly better fill factors and open circuit voltages. Very high shunt resistances (over 1 MΩ cm2) and excellent diode rectification underline the charge selectivity of the solution‐processed WO3 layers. Solution‐processed tungsten oxide (WO3) is incorporated as a hole extraction layer in polymer solar cells. The smooth WO3 films are deposited from an alcohol‐based, surfactant‐free nanoparticle solution which allows the achievement of full functionality via annealing at only 80 °C (no oxygen plasma). The WO3 devices reach fill factors above 67% and efficiencies of around 3%.