Charge Recombination in Organic Photovoltaic Devices with High Open-Circuit Voltages

• Published in: Journal of the American Chemical Society Vol. 130; no. 41; pp. 13653 - 13658
• Main Authors: Westenhoff, Sebastian, Howard, Ian A, Hodgkiss, Justin M, Kirov, Kiril R, Bronstein, Hugo A, Williams, Charlotte K, Greenham, Neil C, Friend, Richard H
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 15.10.2008
• Subjects: blends; Chemical Sciences; composite; dynamics; heterojunctions; Kemi; polymer solar-cells; polythiophene; spectroscopy; transient

A detailed charge recombination mechanism is presented for organic photovoltaic devices with a high open-circuit voltage. In a binary blend comprised of polyfluorene copolymers, the performance-limiting process is found to be the efficient recombination of tightly bound charge pairs into neutral tri...