Organometallic Halide Perovskites: Sharp Optical Absorption Edge and Its Relation to Photovoltaic Performance
Stefaan De Wolf, Jakub Holovský, Soo‐Jin Moon, Philipp Löper, Bjoern Niesen, Martin Ledinský, Franz‐Josef Haug, Jun‐Ho Yum, Christophe Ballif
The Journal of Physical Chemistry Letters · 2014 · 2,865 citationsOpen access
Abstract
Solar cells based on organometallic halide perovskite absorber layers are emerging as a high-performance photovoltaic technology. Using highly sensitive photothermal deflection and photocurrent spectroscopy, we measure the absorption spectrum of CH3NH3PbI3 perovskite thin films at room temperature. We find a high absorption coefficient with particularly sharp onset. Below the bandgap, the absorption is exponential over more than four decades with an Urbach energy as small as 15 meV, which suggests a well-ordered microstructure. No deep states are found down to the detection limit of ∼1 cm(-1). These results confirm the excellent electronic properties of perovskite thin films, enabling the very high open-circuit voltages reported for perovskite solar cells. Following intentional moisture ingress, we find that the absorption at photon energies below 2.4 eV is strongly reduced, pointing to a compositional change of the material.
Cite this paper
Wolf, S. D., Holovský, J., Moon, S., Löper, P., Niesen, B., Ledinský, M., Haug, F., Yum, J., & Ballif, C. (2014). Organometallic halide perovskites: Sharp optical absorption edge and its relation to photovoltaic performance. The Journal of Physical Chemistry Letters, 5(6), 1035–1039. https://doi.org/10.1021/jz500279b
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