Effect of methylammonium concentrations on optical properties of lead halide perovskites

Saif M Qaid^a, Abdullah S Aldwayyan^a, M.A. Majeed Khan^b, Mahmoud Q Hezam^b, M. Alsobaieà^b, Idriss M Bedja^c, Fahhad H Alharbi ^d, Mohammad K Nazeeruddin ^f

^aPhysics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451

^bKing Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2454, Riyadh 11451

^cDepartment of Optometry, College of Applied Medical Sciences, King Saud University, c CRC, Department of Optometry, College of Applied Medical Sciences, King Saud University, P.O. Box 10219, Riyadh 11433

^dQatar Environment and Energy Research Institute (QEERI), Qatar Foundation, PO Box 5825, Doha, Qatar

^eKing Abdulaziz City for Science and Technology (KACST), P.O.Box 6086 Riyadh 11442, Riyadh, Saudi Arabia

^fLaboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, Station 6, CH-1015 Lausanne, Lausanne, Switzerland

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, Saif M Qaid, 068
Publication date: 5th February 2015

Organometal halide perovskite-based solar cells have recently realized large conversion efficiency over 17% showing great promise for a new large scale cost-competitive photovoltaic technology. Thin films of microcrystalline CH₃NH₃PbI₃ with different methylammonium ion concentrations have been successfully deposited onto ultra clean glass substrates using the spin-coating technique. The prepared films have been characterized by X-ray diffraction, optical absorption spectroscopy and photoluminescence characteristics. X-ray diffraction scans reveal that the films are single-phase perovskite and crystallizes in the orthorhombic structure with highly (00l) textured with a crystallite size in the range of approximately 30 to 40 nm.It is observed that the crystallite size increases with the increase of methylammonium ion concentrations. The fundamental optical parameters like band gap and extinction coefficient are calculated in the strong absorption region of absorbance spectra. Finally, the optical absorbance edge of CH₃NH₃PbI₃thin films is described in terms of direct transition model proposed by Tauc in the strong absorption region. The absorption coefficient has been found to be high of the order of 10⁵ cm^-1. The possible optical transition in these films is found to be allowed direct transition. The energy gap increases from 1.481 to 2.5 eV with the increase of methylammonium ion concentrations. Photoluminescence study confirms the blue shift in UV emission when methylammonium ion concentrations is increased.

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.