Proceedings of International Conference on Perovskite and Organic Photovoltaics and Optoelectronics (IPEROP19)
Publication date: 23rd October 2018
Non-fullerene acceptors have great contribution to improving a power conversion efficiency of organic photovoltaics these days because of their superior light-harvesting properties in the near-IR region and their highly tunable molecular energy levels compared with fullerene counterparts. However, little is known about the reason why non-fullerene acceptors can enhance the photocurrent generation effectively even in the near-IR region. In order to address the origin of the efficient photocurrent generation in the near-IR region, we focused on the exciton diffusion, which is limited by lifetime in the excited state. We measured singlet exciton lifetimes of various non-fullerene acceptor neat films (IEICO-4F, 3TT-FIC, IEICO, IT-4F, ITIC, IT-M, O-IDTBR, O-IDFBR, and FBR) by transient absorption spectroscopy. For comparison, we also measured singlet exciton lifetimes of various conjugated polymer films. By using PL quantum efficiency, we evaluated non-radiative decay rates of various non-fullerene acceptors and conjugated donor polymers with different bandgaps. As a result, we found that non-radiative decay rates of non-fullerene acceptors have weaker energy gap dependence than that of conjugated polymers. Interestingly, non-radiative decay rates are as slow as ~2 × 1010 s-1 for non-fullerene acceptors while they are as fast as ~10 × 11 s-1 for conjugated polymers at around 1000 nm. We therefore conclude that the effective photocurrent generation is partially due to longer exciton lifetimes of non-fullerene acceptors in the near-IR region.
We would like to thank Professor Osaka at Hiroshima University for providing non-fullerene acceptors 3TT-FIC, IEICO, and IT-4F. This study was partly supported by JST ALCA Grant Number JPMJAL1404 and JSPS KAKENHI Grant Number JP26248033, Japan.
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.