Effect of CH3NH3PbI3 Perovskite Cuboids Size on Ferroelectric Characteristics

Nam-Gyu Park^a, Sang-Woo Kim^a, Sung Kyun Kim^a, Hui-Seon Kim^a

^aSungkyunkwan University, South Korea, 300 Cheoncheon-dong, Jangan-gu, Suwon, 440, Korea, Republic of

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

Oral, Hui-Seon Kim, presentation 045
Publication date: 5th February 2015

Size-dependent polarization characteristics of CH₃NH₃PbI₃ perovskite cuboids were investigated by piezoresponse force microscopy (PFM). From the PFM measurement, It is found that the dipole array domain was closely overlapped with perovskite cuboids size. Unpoled (V_app= 0 V) perovskite showed some extent of spontaneous polarization where 700 nm-sized perovskite cuboids had dipole orientation toward both (+) and (-) direction, but the dipole alignment toward (-) direction was highly enhanced with 100 nm-sized small cuboids. While dipole alignment in large perovskite cuboids (700 nm) were siginificantly dependent on the poling direction showing switchable characteristic, small perovskite cuboids (100 nm) always showed a biased-dipole alignment toward (-) direction regardless of a given poling direction (V_app= +/- 3 V). The aligned dipole retention after a removal of external field (poling) was quite stable showing the retention time of 30 min or more. These observations suggest that crystal size is a dominant factor to determine the dipole polarization characteristics which is carefully correlated with the effective charge separation and retarded charge recombination in bulk perovskite by the aid of the developed internal electric field. In terms of an actual device level, the large crystals with positive poling provides a favorable internal electric field for the separating generated charge carrier and also inhibits carrier trapped at the boundary of dipole domain leading alleviated I-V hysteresis.

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.