Dresden 2009 – scientific programme

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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices

SYOP 2: Organic Photovoltaics: from Single Molecules to Devices

SYOP 2.5: Invited Talk

Thursday, March 26, 2009, 11:30–12:00, BAR SCHÖ

Correlation of Interfacial Composition and Bulk Morphology to Device Performance in Organic Bulk Heterojunction Solar Cells — David Germack¹, •Joseph Kline¹, Daniel Fischer¹, Lee Richter¹, Calvin Chan¹, David Gundlach¹, Michael Toney², and Dean DeLongchamp¹ — ¹National Institute of Standards and Technology, Gaithersburg, USA — ²Stanford Synchrtron Radiation Lightsource, Menlo Park, USA

Organic and hybrid inorganic/organic photovoltaic cells promise to drop solar energy costs low enough to compete with conventional technologies such as coal. Direct measurements of the morphology of bulk heterojunction blends are critical to future efficiency improvements. We have developed strategies to measure the orientation, distribution and dimension of morphological features in materials for organic thin film transistors and photovoltaic devices that have led to rational guidelines for the design of new polymeric materials and processing techniques. By using Near Edge X-Ray Absorption Fine Structure (NEXAFS) and ultra-violet variable angle spectroscopic ellipsometry (UV-VASE) in combination with grazing incidence X-ray diffraction (GIXD) and atomic force microscopy (AFM) we have developed models of interfacial composition and morphology and the vertical composition of a P3HT:PCBM blend. We will describe our ongoing efforts to correlate the electrical performance of P3HT/PCBM blend devices to measurements of interfacial composition and morphology and bulk morphology.