On the role of HOOC(CH2)4NH3I for precipitation of CH3NH3PbCl3 in CH3NH3PbI3: An investigation by modulated surface photovoltage spectroscopy

Thomas Dittrich^a, Pongthep Prajongtat^a^,^b

^aDepartment of Materials Science, Faculty of science, Kasetsart University, Bangkok, 10900

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, Pongthep Prajongtat, 318
Publication date: 5th February 2015

Chlorine and the crystallization process play a decisive role for high efficiencies of lead halide perovskite solar cells [W. Nie et al., Science 347 (2015) 522]. However, the amount of chlorine in the lead halide perovskite absorber is very low. Here, we show by using X-ray diffraction that addition of a small amount of HOOC(CH₂)₄NH₃I (AVAI) into CH₃NH₃I (MAI) and PbCl₂ in N,N-dimethylformamide precursor solutions can induce precipitation of CH₃NH₃PbCl₃ (MAPbCl₃) in CH₃NH₃PbI₃ (MAPbI₃). Lead halide perovskite layers were investigated by modulated surface photovoltage spectroscopy. The precipitation of MAPbCl₃ in MAPbI₃ can lead to a strong reduction of characteristic energy of exponentially distributed defect states below the bandgap of MAPbI₃. At the same time, the onset energies of the SPV signals, which are related to the bandgap, remained practically unchanged. The reduced density of defects in MAPbI₃ may be understood if assuming a crystallization process of MAPbI₃ starting from the precipitates of MAPbCl₃.

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.