Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 94, Issue 12, Pages 2416-2421Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.solmat.2010.08.031
Keywords
Inverted organic solar cell; Interlayer; MoO3; Illumination intensity
Funding
- National Natural Science Foundation of China [10804006, 10774013]
- National Natural Science Funds for Distinguished Young Scholar [60825407]
- Natural Science Foundation of Beijing [1102028]
- Major State Basic Research Development Program of China [2010CB327704]
- 111 Project [B08002]
- Foundation of Key Laboratory of Luminescence and Optical Information [2010LO103]
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Inverted small molecule organic solar cells were fabricated with a Ca modified indium tin oxide (ITO) substrates as the cathode and molybdenum trioxide (MoO3) interlayer modified Ag as anode. The Ca and MoO3 layers were found to be critical to the device performance. The insertion of Ca forms Ohmic contact between ITO and fullerene (C-60), significantly enhancing the fill factor and further improvement of efficiency by 65% compared to the device without Ca layer. MoO3 interlayer has multiple functions as anode buffer layer, effectively preventing the exciton quenching and reducing the interfacial resistance. Optimal copper phthalocyanine (CuPc) thickness of 25 nm demonstrates that the balance between light harvesting and charge transport is obtained and a maximum PCE of 0.64% under 100 mW/cm(2) is achieved. Finally, the dependencies of the short-circuit current density and the open-circuit voltage on illumination intensity were investigated. (C) 2010 Elsevier B.V. All rights reserved.
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