Optical Description of Mesostructured Organic-Inorganic Halide Perovskite Solar Cells.
Herein we describe both theoretically and experimentally the optical response of solution-processed organic-inorganic halide perovskite solar cells based on mesostructured scaffolds. We develop a rigorous theoretical model using a method based on the propagation of waves in layered media, which allows visualizing the way in which light is spatially distributed across the device and serves to quantify the fraction of light absorbed by each medium comprising the cell. The discrimination between productive and parasitic absorption yields an accurate determination of the internal quantum efficiency. State-of-the-art devices integrating mesoporous scaffolds infiltrated with perovskite are manufactured and characterized to support the calculations. This combined experimental and theoretical analysis provides a rational understanding of the optical behavior of perovskite cells and can be beneficial for the judicious design of devices with improved performance. Notably, our model justifies the presence of a solid perovskite capping layer in all of the highest efficiency perovskite solar cells based on thinner mesoporous scaffolds.
†Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, Calle Américo Vespucio 49, 41092 Sevilla, Spain.
Miguel
M
Anaya
†Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, Calle Américo Vespucio 49, 41092 Sevilla, Spain.
Gabriel
G
Lozano
†Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, Calle Américo Vespucio 49, 41092 Sevilla, Spain.
Mauricio E
ME
Calvo
‡Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford X1 3PU, United Kingdom.
Wei
W
Zhang
‡Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford X1 3PU, United Kingdom.
Michael B
MB
Johnston
‡Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford X1 3PU, United Kingdom.
Henry J
HJ
Snaith
†Instituto de Ciencia de Materiales de Sevilla, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, Calle Américo Vespucio 49, 41092 Sevilla, Spain.
Hernán
H
Míguez
optical design; perovskite; photovoltaics