Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 93, Issue 5, Pages 604-608Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2008.12.007
Keywords
Photovoltaic cells; Conjugated polymer; Buffer layer; Charge collection
Funding
- National Natural Science Foundation of China [50873100, 20834005, 20621401]
- National Key Lab of Integrated Optoelectronics, Jilin University [2006-JLU-01]
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We report enhanced polymer photovoltaic (PV) cells by utilizing ethanol-soluble conjugated poly (9, 9-bis (6'-diethoxylphosphorylhexyl) fluorene) (PF-EP) as a buffer layer between the active layer consisting of poly(3-hexylthiophene)/[6, 6]-phenyl C61-butyric acid methyl ester blend and the Al cathode. Compared to the control PV cell with Al cathode, the introduction of PF-EP effectively increases the shunt resistance and improves the photo-generated charge collection since the slightly thicker semi-conducting PF-EP layer may restrain the penetration of Al atoms into the active layer that may result in increased leakage current and quench photo-generated excitons. The power conversion efficiency is increased ca. 8% compared to the post-annealed cell with Al cathode. (C) 2008 Elsevier B.V. All rights reserved.
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