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Afshin Hadipour, David Cheyns, Paul Heremans and Barry P. Rand Electrode Considerations for the Optical Enhancement of Organic Bulk Heterojunction Solar Cells Advanced Energy Materials 1

Version of Record online: 4 AUG 2011 | DOI: 10.1002/aenm.201100250

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The optical enhancement in conventional and inverted bulk heterojunction organic solar cells is systematically studied with respect to the anode and cathode buffer layers (BL). By removing parasitic absorption caused by low work function metals such as calcium, the photocurrent is increased by 25% leading to an improved efficiency of 3.9% for structures without calcium as a BL compared to reference cell performance of 3.2% using calcium as an electron accepting BL. Furthermore, the impact of the optical properties of transition metal oxides on device performance is assessed.

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