Journal
NATURE PHOTONICS
Volume 11, Issue 2, Pages 85-90Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2016.240
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Funding
- MoST [2014CB643502, 2016YFA0200200]
- NSFC [51373078, 51422304, 91433101, 51323003, 51473053]
- International Science and Technology Cooperation Program of China [2013DFG52740]
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An effective way to improve the power conversion efficiency of organic solar cells is to use a tandem architecture consisting of two subcells, so that a broader part of the solar spectrum can be used and the thermalization loss of photon energy can be minimized(1). For a tandem cell to work well, it is important for the subcells to have complementary absorption characteristics and generate high and balanced (matched) currents. This requires a rather challenging effort to design and select suitable active materials for use in the subcells. Heke, we report a high-performance solution-processed, tandem solar cell based on the small molecules DR3TSBDT and DPPEZnP-TBO, which offer efficient, complementary absorption when used as electron donor materials in the front and rear subcells, respectively. Optimized devices achieve a power conversion efficiency of 12.50% (verified 12.70%), which represents a new level of capability for solution-processed, organic solar cells.
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