Perovskite solar cells are called to revolutionize the field of optoelectronic due to their intrinsic high absorption. Photonic structuration is widely reported as an efficient way to improve light harvesting. Nevertheless, little is known on the combination of photonic structuring and perovskite material.
In this study, photonically-structured TiO2 is considered as photoanode layer for perovskite solar cells in a will to enhance light absorption through the excitation of quasi-guided modes within the photoactive perovskite material, while optimizing the charge collection and the global efficiency in the photovoltaic assemblies. Consequently, the photo-active layer is structured using opal-like perovskite layers (monolayers, bilayers or trilayers) made of perovskite (full or truncated) spheres, including hybrid uniform/structured layers, embedded in a TiO2 matrix. We present both numerical simulations and experimental results.
Perovskite solar cells have been under the spotlight of the photovoltaics community. However, little is known on the impact of structuring the active material using photonic crystal layers. We present here numerical simulations showing the effect of photonic crystal structuring on the integrated quantum efficiency of perovskite solar cells. The photo-active layer is structured using opal-like perovskite layers made of perovskite (full or truncated) spheres, including hybrid uniform/structured layers, embedded in a TiO2 matrix. The excitation of quasi-guided modes inside the absorbing spheres increases the integrated quantum efficiency and the photonic enhancement factor. A genetic algorithm approach allows us to determine the optimum structure among more than 1.4 10^9 potential combinations. These numerical results of the benefits of photonic structuring on perovskite solar cells are also compared to experimental studies on selected configurations of perovskite solar cells.
Publisher's Note: One of the authors listed on the first published version of this paper (original publication date 21 March 2018) was removed on 4 February 2019 at the request of that author. The paper has been updated to reflect this change.
Self-assembled synthetic opals are suitable for integration into solution-processed thin film solar cells. In this work, finite-difference time-domain simulations are carried out to tailor optical properties of monolayer and multilayers of semiconductor spheres to trap light when these structures are incorporated into thin film solar cells. In particular, architectures in which spheres are filled with a photoactive material and embedded in a lower refractive index medium are examined. Based on spectra and field intensity maps, this study demonstrates that opal-like photonic crystals obtained from colloidal templates and filled with light-absorbing material can significantly harvest light by exploiting photonic band resonances.
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