Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics (AP-HOPV17)
Publication date: 7th November 2016
Photovoltaic cells based on hybrid perovskite absorbers have rapidly emerged as very promising for commercial applications since they have recently exceeded 20% solar power conversion efficiencies using low-cost solution-based processes.1 Mixed cation and halide hybrid perovskites possess superior optoelectronic properties, such as large absorption coefficient and long charge carrier diffusion length.2,3 Optimization of device structure and processing have led to a rapid increase in the device performance over the last 6 years.4, 5 Despite the remarkable achievements on pushing the efficiencies to new heights, huge gaps in knowledge of the absorption and emission semiconducting properties which may involve electron transitions from one energy state to another or other materials, a fundamental material property for energy conversion of photovoltaic devices, still have not been filled. Charge carrier dynamics are also a critical issue in not only perovskite materials but also for the fundamental understanding of solar cell devices in order to optimize device performance and approach the Shockley–Queisser efficiency limit of about 31% for 1.55 eV bandgap perovskite.6, 7
In this study, we investigated the excitation density dependence of the photoluminescence (PL) properties of methylammonium lead iodide (MAPI3) perovskite films and the PL quenching efficiency (PLQE) of perovskite in junction with PEDOT:PSS and PC61BM, hole and electron acceptors respectively. Ground state optical spectroscopy in combination with femtosecond Transient Absorption Spectroscopy (fs-TAS) and time-resolved PL (tr-PL) allow us to unravel the excited state dynamics in these perovskite films and their interfaces with charge extracting layers. Our results demonstrate that the charge carrier density-dependant bimolecular recombination kinetics of MAPI3 compete with charge extraction at light fluxes approaching 1 sun. Ultimately, the excitation densities should be carefully considered when conducting PLQE experiments in order to mimic operating conditions and extract appropriate values of carrier sxtraction.
1. NREL efficiency chart.
2. J. H. Im, C. R. Lee, J. W. Lee, S. W. Park and N. G. Park, Nanoscale, 2011, 3, 4088-4093.
3. G. Xing, N. Mathews, S. Sun, S. S. Lim, Y. M. Lam, M. Gratzel, S. Mhaisalkar and T. C. Sum, Science, 2013, 342, 344-347.
4. Y. Rong, Z. Tang, Y. Zhao, X. Zhong, S. Venkatesan, H. Graham, M. Patton, Y. Jing, A. M. Guloy and Y. Yao, Nanoscale, 2015, 7, 10595-10599.
5. Y. Y. Zhou, M. J. Yang, W. W. Wu, A. L. Vasiliev, K. Zhu and N. P. Padture, Journal of Materials Chemistry A, 2015, 3, 8178-8184.
6. J. S. Manser and P. V. Kamat, Nature Photonics, 2014, 8, 737-743.
7. W. E. I. Sha, X. Ren, L. Chen and W. C. H. Choy, Applied Physics Letters, 2015, 106, 221104.
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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.