New, Edward G., Howells, Thomas J., Sullivan, Paul J. and Jones, T. S. (Tim S.) (2013) Small molecule tandem organic photovoltaic cells incorporating an α-NPD optical spacer layer. Organic Electronics, Volume 14 (Number 9). pp. 2353-2359. doi:10.1016/j.orgel.2013.05.037 ISSN 1566-1199.
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Abstract
We report an improvement in power conversion efficiency in a small molecule tandem organic photovoltaic (OPV) device by the optimisation of current balancing of the sub-cells using an optical spacer layer. A co-deposited layer of N,N’-bis(1-naphthyl)-N,N′-diphenyl-1,1’-biphenyl-4,4’-diamine (α-NPD) and molybdenum oxide was used as the optical spacer layer and provided a highly transparent and conductive layer. Optical simulations showed the addition of the optical spacer in a boron subphthalocyanine (SubPc)/C60 based tandem OPV device increased the SubPc absorption in the front sub-cell and resulted in current balancing through the device. Fabricated tandem OPV devices showed similar trends, with the power conversion efficiency increasing from 2.3% to 4.2% with the addition of an optimised optical spacer thickness. External quantum efficiency and total absorption efficiency measurements back up the optical model data which attribute the increased performance to improved SubPc absorption in the front sub-cell, balancing the photocurrents of the two sub-cells.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry |
| Library of Congress Subject Headings (LCSH): | Photovoltaic power generation , Molybdenum oxides, Molybdenum compounds, Molecular spectroscopy |
| Journal or Publication Title: | Organic Electronics |
| Publisher: | Elsevier BV |
| ISSN: | 1566-1199 |
| Official Date: | September 2013 |
| Dates: | Date Event September 2013 Published |
| Volume: | Volume 14 |
| Number: | Number 9 |
| Page Range: | pp. 2353-2359 |
| DOI: | 10.1016/j.orgel.2013.05.037 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Date of first compliant deposit: | 24 December 2015 |
| Date of first compliant Open Access: | 24 December 2015 |
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), University of Warwick Postgraduate Research Scholarship |
| Grant number: | EP/G031088/1 |
| URI: | https://wrap.warwick.ac.uk/55448/ |
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