Transient activation/bleaching of photoluminescence in lead halide perovskites

Miguel Anaya^a, Juan F. Galisteo-López^a, Mauricio E. Calvo^a, Hernán Míguez^a

^aInstituto de Ciencia de Materiales de Sevilla (ICMS), Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Sevilla, C/ Américo Vespucio 49, Sevilla, Spain

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, Juan F. Galisteo-López, 195
Publication date: 5th February 2015

Hybrid organic-inorganic lead halide perovskites have recently entered the race for a low-cost high efficiency material to serve as light harvester for the next generation photovoltaic devices. While reports on improved efficiency are being updated by the week, evidencing unprecedented performances for solution processed photovoltaic approaches, issues related with the realization of real-world devices are only recently being tackled such as long term stability, material degradation, etc. Beside the interest in photovoltaic applications their potential use as luminescent material for light emitting devices, a good performance in both fields being linked [1], has fostered a number of studies exploring the performance of perovskites from the point of view of their optical gain, [2] quantum yield or as components for LEDs [3] to name but a few. Again, concern on stability and degradation affecting their performance is being raised. In this work we have studied the transient photoluminescence (PL) of perovskite films under constant optical excitation. A competition between an activation and photobleaching of their PL is observed which strongly depends on the optical pump characteristics (see Figure). While PL activation has been recently reported and associated with the passivation of trap states related with defects [4], the origin of the bleaching is not clear. Aspects such as sample morphology and ambient conditions are considered and their influence on the transient emission discussed.
Time evolution of the normalized PL of lead halide perovskites films as the optical pump power is increased.
[1] Miller, D. M.; Yablonovitch, E.; Kurtz, S. R. Strong Internal and External Luminescence as Solar Cells Approach the Shockley-Queisser Limit, IEEE J. Photovoltaics 2012, 2, 303-311. [2] Xing, G.; Mathews, N.; Lim S. S.; Yantara, N. N.; Liu, X.; Sabba, D.; Grätzel, M.; Mhaisalkar, S.; Sum, T.C. Low-temperature Solution-processed Wavelength-tunable Perovskites for Lasing, Nat. Mater. 2014, 13, 476-480. [3] Tan, Z-K.; Moghaddam, R. S.; Lai, M. L.; Docampo, P.; Higler, R.; Deschler, F.; Price, M.; Sahanala, A.; Pazos, L. M.; Credgington, D.; Hanusch, F.; Bein, T.; Snaith, H. J.; Friend, R. H. Bright Light-emitting Diodes Based on Organometal Halide Perovskite, Nat. Nanotech. 2014, 9, 687-692. [4] Stranks, S. D.; Burlakov, V. M.; Leitjens, T.; Ball, J. M.; Goriely, A.; Snaith, H. J. Recombination Kinetics in Organic-Inorganic Perovskites: Excitons, Free Charge, and Subgap States, Phys. Rev. Appl. 2014, 2, 034007.

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.