期刊
SOLAR ENERGY MATERIALS AND SOLAR CELLS
卷 120, 期 -, 页码 716-723出版社
ELSEVIER
DOI: 10.1016/j.solmat.2013.08.008
关键词
Organic photovoltaics; Tandem organic photovoltaics; Schottky Junction; Modeling of solar cells; Novel solar cells
资金
- Center for Re-defining Photovoltaic Efficiency Through Molecule Scale Control, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- NSF [EEC-0228390]
Organic photovoltaics (OPVs) promise a low-cost alternative to traditional inorganic PV technology. Recently, the relatively poor efficiency of a bulk-heterojunction OPV has been improved considerably (> 10%) in a tandem cell configuration, albeit at the expense of using four different organic materials. In this work, we revive the concept of 'single-material tandem cells' - originally developed in the 1990s to address the transport bottleneck of a-Si solar cell. We demonstrate that OPV sub-cells made of the single polymer (or organic semiconductor) and arranged in a series tandem configuration can lead to impressive (factor of 2-5) efficiency gains, provided that the sub-cells can be thinned for optimum carrier collection and stacked for improved light absorption. Our analysis may open up a new direction in OPV research and a completely different design space for such tandem structures. (C) 2013 Elsevier B.V. All rights reserved.
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