Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.052
Publication date: 20th April 2022
Photonic structures have attracted a lot of attention due to their ability to efficiently manage light absorption in various optoelectronic materials. Among multiple approaches, highly-ordered opal structures can be experimentally designed from the self-assembly of sacrificial monodisperse sub-micrometer spheres as colloidal photonic crystals, using wet chemistry methodologies. A corresponding strategy is considered here for the processing of 3D-structured layers in perovskite solar cells (PSCs) so to enhance light harvesting properties due to the excitation of quasi-guided modes within the photoactive layer [1,2], while facilitating the further incorporation of the materials and consequently at improving the charge extraction and separation, and impact the photoconversion efficiency.
Practically, polystyrene beads are considered as hard templating sacrificial agents for the design of inverse-opal electron-conducting TiO2 [3] or of CH3NH3PbI3 perovskite porous layers [submitted] through spin coating protocols, from which full solid-state architectures of PSCs are consecutively assembled (see TOC graphic). The positive effect of the porous structuration of the photoactive layers in comparison with dense, unstructured counterparts is demonstrated. Moreover, the specific impact of the pore dimensions on the morphological and optoelectronic properties of the structured layers is studied through structural (SEM, XRD), optical (UV-VIS-NIR, ellipsometry) and electronic analyses (I-V curves, EIS). The influence on the photon absorption intensity and lifetime on the charge recombination mechanisms within structured and unstructured active layers is further discussed.
Ultimately, optimums of structural configurations are experimentally established in terms of light harvesting and of power conversion efficiency, in good correspondence with recent numerical studies. Maximized light absorption is reached for 500 nm diameter pores structure, with photonic enhancement factors as high as 9% with inverse opal TiO2 photoanodes and 16% with inverse opal perovskite layers, compared to unstructured compact benchmarks.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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