Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Organometallic mixed halide perovskite- based solar cells have recently shown a breakthrough in power conversion efficiency, with devices exceeding 15 percent12. The high PL efficiency of CH3NH3PbI3-xClx makes it ideally suited to photovoltaic devices, and also to light emitting devices. We show with ultrafast transient absorption and photoluminescence measurements that charge generation in these materials occurs within 1 picosecond, and radiative bimolecular recombination is the dominant decay mechanism above low fluence thresholds3. We look more closely at the transient absorption response of full working devices under different electrical biases, and show that larger fields than initially expected are required to induce a change in photo-excited charge lifetime.
Investigating other applications in light of these findings, we present a detailed study of the transient optical response of a perovskite vertical microcavity structure. The fast cavity ring-down time of the central emission mode compared to the other modes, and the increased line narrowing prove amplified spontaneous emission occurs in the materials above the low threshold of 0.2uJ per pump pulse. Further, intensity correlation measurements with a Hanbury-Brown and Twiss setup show a large decrease in the second order auto-correlation function of emitted light above threshold at zero time delay. This proves coherent light emission and the first instance of an optically pumped perovskite laser.
Emission spectrum of a vertical microcavity with structure as shown in the inset using a perovskite film as gain medium. The thickness of the perovskite layer was around 500nm and around 1µm for the PMMA layer. Excitation was performed with a pulsed laser (400ps) at 2.33eV and fluences as stated. At low fluences three modes are resonant in the cavity with a mode spacing of ~9.5THz. At sufficiently high fluences the mode at 1.6eV is amplified.
1. Liu, M., Johnston, M. B. & Snaith, H. J. Efficient planar heterojunction perovskite solar cells by vapour deposition. Nature (2013). doi:10.1038/nature12509 2. Burschka, J. et al. Sequential deposition as a route to high-performance perovskite-sensitized solar cells. Nature 3–7 (2013). doi:10.1038/nature12340 3. Deschler, F. et al. High Photoluminescence Efficiency and Optically-Pumped Lasing in Solution-Processed Mixed Halide Perovskite Semiconductors. J. Phys. Chem. Lett. 140324121627005 (2014). doi:10.1021/jz5005285
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.
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.
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.