Stacking Orientation Mediation of Pentacene and Derivatives for High Open-Circuit Voltage Organic Solar Cells

详细信息    查看全文

• 作者：Chi-Ta Chou ; Chien-Hung Lin ; Yian Tai ; Chin-Hsin J. Liu ; Li-Chyong Chen ; Kuei-Hsien Chen
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2012
• 出版时间：May 3, 2012
• 年：2012
• 卷：3
• 期：9
• 页码：1079-1083
• 全文大小：301K
• 年卷期：v.3,no.9(May 3, 2012)
• ISSN：1948-7185

文摘

In this Letter, we investigated the effect of the molecular stacking orientation on the open circuit voltage (V_OC) of pentacene-based organic solar cells. Two functionalized pentacenes, namely, 6,13-diphenyl-pentacene (DP-penta) and 6,13-dibiphenyl-4-yl-pentacene (DB-penta), were utilized. Different molecular stacking orientations of the pentacene derivatives from the pristine pentacene were identified by angle-dependent near-edge X-ray absorption fine structure measurements. It is concluded that pentacene molecules stand up on the substrate surface, while both functionalized pentacenes lie down. A significant increase of the V_OC from 0.28 to 0.83 V can be achieved upon the utilization of functionalized pentacene, owing to the modulation of molecular stacking orientation, which induced a vacuum-level shift.

Keywords:

organic solar cell; photovoltaic; V_OC; molecular orientation