Journal
NATURE PHOTONICS
Volume 7, Issue 12, Pages 995-1000Publisher
NATURE RESEARCH
DOI: 10.1038/NPHOTON.2013.276
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Funding
- Ministerio de Economia y Competitividad [MAT2011-28665, IPT-120000-2010-29, IPT-2012-0986-120000, CSD2007-00046]
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Organic solar cells have unique properties that make them very attractive as a renewable energy source. Of particular interest are semi-transparent cells, which have the potential to be integrated into building facades yet not completely block light. However, making organic cells transparent limits the metal electrode thickness to a few nanometres, drastically reducing its reflectivity and the device photon-harvesting capacity. Here, we propose and implement an ad hoc path for light-harvesting recovery to bring the photon-to-charge conversion up to almost 80% that of its opaque counterpart. We report semi-transparent PTB7:PC71BM cells that exhibit 30% visible light transmission and 5.6% power conversion efficiency. Non-periodic photonic crystals are used to trap near-infrared and near-ultraviolet photons. By modifying the layer structure it is possible to tune the device colour without significantly altering cell performance.
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