Lo, M.F., Ng, T.W., Liu, T.Z., Roy, V.A.L. , Lai, S.L., Fung, M.K., Lee, C.S. and Lee, S.T. (2010) Limits of open circuit voltage in organic photovoltaic devices. Applied Physics Letters, 96(11), 113303. (doi: 10.1063/1.3360336)
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Abstract
Open circuit voltage (Voc) of organic photovoltaic devices has been interpreted with either the metal-insulator-metal (MIM) model or the energy offset between highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor (HOMOD-LUMOA). To elucidate the relation between Voc and the two models, we have used electrodes of a wide range of work functions to connect the CuPc/C60 organic photovoltaic devices. We found that when the work function difference (Δϕelectrodes) between ITO and Al electrode is in the range −3 and 0 eV, Voc increases linearly with Δϕelectrodes as prescribed by the MIM model. Outside this range, Voc saturates with values close to that given by the HOMOD-LUMOA less the exciton binding energy.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Vellaisamy, Professor Roy |
| Authors: | Lo, M.F., Ng, T.W., Liu, T.Z., Roy, V.A.L., Lai, S.L., Fung, M.K., Lee, C.S., and Lee, S.T. |
| College/School: | College of Science and Engineering > School of Engineering |
| Journal Name: | Applied Physics Letters |
| Publisher: | AIP Publishing |
| ISSN: | 0003-6951 |
| ISSN (Online): | 1077-3118 |
| Published Online: | 18 March 2010 |
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