Journal
SYNTHETIC METALS
Volume 158, Issue 21-24, Pages 908-911Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2008.06.011
Keywords
Photovoltaic cells; Conjugated polymer; Thermal annealing; Open-circuit voltage; Power conversion efficiency
Funding
- National Natural Science Foundation of China [50573076, 20621401]
- National Key Lab of Integrated Optoelectronics, Jilin University [2006-JLU-01]
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We have investigated the effects of thermal annealing before and after cathode deposition on poly(3-hexylthiophene)(P3HT)/[6,6]-phenyl C61-butyric acid methyl ester (PCBM) blend photovoltaic cells with different cathode buffer layers. The introduction of cathode buffer layer such as lithium fluoride (LiF) and calcium oxide (CaO) in pre-annealing cells can increase the open-circuit voltage (V-oc) and the power conversion efficiency (PCE). Post thermal annealing after cathode deposition further enhanced the PCE of the cells with LiF/Al cathode. whereas the performance of the cell with CaO/Al cathode is decreased. It is found that the V-oc, and PCE can be largely enhanced when the post-annealed cell with Ca/Al cathode is exposed in air. This may attribute to the formation of CaO buffer layer, which favors increasing shunt resistance and V-oc. Finally, a PCE of 4.60% is calculated under AM1.5G solar illumination at 100 mW/cm(2). (C) 2008 Elsevier B.V. All rights reserved.
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