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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 fac¸ades 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.
CitationBetancur, R. [et al.]. Transparent polymer solar cells emplotings a layered light-trapping architecture. "Nature photonics", Octubre 2013, p. 1-6.
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