Journal
PHYSICA B-CONDENSED MATTER
Volume 445, Issue -, Pages 56-59Publisher
ELSEVIER
DOI: 10.1016/j.physb.2014.04.004
Keywords
Organic PV cells; Conjugated polymer; HOMO-LUMO levels
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Funding
- International Program in the Physical Sciences (IPPS) of Sweden
- National Research Foundation (NRF), South Africa
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The correlation belvveen the open circuit voltage and the LUMO offset of the donor and acceptor polymers in the bulkheterojunction solar cell was studied for three different thiophene derivatives. The HOMO levels of all the polymers in this investigation were chosen to be similar which results in close values of Delta E-DA = E-HOMO(D) - E-LUMO(A). However, the measured V was found to be increasing with decreasing value of the LUMO offset that exists between the donor polymer and fullerene. (C) 2014 Elsevier B.V. All rights reserved.
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