Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV18)
Publication date: 21st February 2018
Organic-inorganic halide perovskites have emerged as promising light absorbers for solar cells due to their superior photophysical properties and promise for low-cost solution processability. Perovskite solar cells have experienced tremendous development in the past few years with power conversion efficiency (PCE) rapidly increased to over 20%. Besides efficiency, another critical factor for practical application of perovskite solar cells is stability.
Recently, Ruddlesden-Popper perovskites (RPPs) have been reported to have promising stability. The RPPs can be structurally derived from their 3D (three-dimensional) counterparts with alternating organic ammonium layers and perovskite layers, giving the general formula of (RNH3)2An-1MnX3n+1, where n represents the number of perovskite layers, RNH3 is the organic spacer, and the A (small cation), M (divalent metal cation) and X (halide anion) form the perovskite framework. The superior stability of RPPs can be attributed to the hydrophobic property of the organic spacer, which inhibits water molecules from penetrating and attacking the inorganic layers.
However, the efficiency of solar cells based on RPPs is much lower than that based on three-dimensional perovskites, mainly attributed to their poor charge transport. Herein, we report a simple and universal method for growing high-quality RPP films, which results in hysteresis-free solar cells with a high PCE over 12% and excellent reproducibility. These high-quality films are achieved by incorporating DMSO and CH3NH3Cl (MACl) additives into precursor solution, followed by one-step spin-coating and solvent annealing processes. We systematically study the synergistic effects of DMSO and MACl additives on controlling the crystallization of RPPs. We find that the additives can greatly improve the film quality of RPPs, leading to uniform morphology, enhanced crystallinity, and reduced energetic disorder. In addition, the resulting films show preferential orientation with their perovskite frameworks perpendicular to the substrate, which we assume is responsible for facilitating efficient carrier transport. Furthermore, they show graded distribution of multiple RPP phases with type-II band alignment, which is favourable for self-driven charge separation. Our method paves the way for further development of high-quality RPP films for efficient optoelectronic devices.
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.