Transparent polymer solar cells employing a layered light-trapping architecture

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Abstract

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 façades 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:PC 71 BM 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. © 2013 Macmillan Publishers Limited. All rights reserved.

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Betancur, R., Romero-Gomez, P., Martinez-Otero, A., Elias, X., Maymó, M., & Martorell, J. (2013). Transparent polymer solar cells employing a layered light-trapping architecture. Nature Photonics, 7(12), 995–1000. https://doi.org/10.1038/nphoton.2013.276

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