Optical Description of Perovskite Solar Cells

Hernán Míguez^a, Mauricio E Calvo^a, Miguel Anaya^a, Gabriel Lozano^a, Henry J Snaith^b, Wei Zhang^b, Michael B Johnston^b

^aDepartment of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Miguel Anaya, 193
Publication date: 5th February 2015

Perovskite solar cells (PSCs) are attracting the attention of the scientific community since they are breaking with the tradeoff between efficiency and fabrication cost.^1,2 Up to now, the efforts have been mainly focused on chemical management and preparation methods in order to obtain highly efficient devices. Alternatively, our investigation is centered on how light interacts with the different components within the PSC with the aim of obtaining thinner and more efficient cells. In this talk, we present a rigorous theoretical and experimental description of the optical response of mesostructured PSCs, i.e. organic-inorganic metal halide perovskite, prepared using a one-step deposition method, sandwiched between an n-type and p-type charge collection layer. ³ We report the values of the optical constants of the CH₃NH₃PbI₃, with which we have been able to theoretically reproduce the optical behavior of the full device. We have developed a model based on the transfer matrix method that, considering the polarization and the angle of the incoming light, allows observing how the light is spatially distributed along the cell. This makes possible to estimate the fraction of light captured by the different components of the device, and thus discriminate between productive (absorbed in the perovskite material) and parasitic (absorbed in other components such as FTO, or the metallic contact) absorption. The suitability of the proposed theoretical model is supported by an in-depth experimental analysis of the optical effects occurring in state-of-the-art devices. These results lead us to propose new designs in which both the active and hole-transporter layer thicknesses are modified in order to obtain an optimized absorption. Moreover, we present a complete analysis concerning how the use of different mesostructured scaffolds affects the internal quantum efficiency as well as the aesthetical appearance of the PSCs. Our investigation provides a theoretical tool to design devices in which photonic enhancing components can be integrated to maximize the light harvesting efficiency of the cells.
Left: Scheme of a mesostructured perovskite solar cell. Right: Calculated spatial distribution of the electric field along a cross section of a state-of-the-art perovskite solar cell
1. Lee, M. M.; Teuscher, J.; Miyasaka, T.; Murakami, T. N.; Snaith, H. J. Efficient Hybrid Solar Cells Based on Meso-Superstructured Organometal Halide Perovskites. Science 2012, 338, 643-647. 2. Green, M. A.; Ho-Baillie, A.; Snaith, H. J. The Emergence of Perovskite Solar Cells. Nature Photonics 2014, 8, 506-514. 3. Anaya, M.; Lozano, G.; Calvo, M. E.; Zhang, W.; Johnston, M. B.; Snaith, H. J.; Míguez, H. Optical Description of Mesostructured Organic–Inorganic Halide Perovskite Solar Cells. Journal of Physical Chemistry Letters 2015, 6, 48-53.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

MATSUS

Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.

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.

Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics

The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.