title: Channeling Exciton Migration into Electron Transfer in Formamidinium Lead Bromide Perovskite Nanocrystal/Fullerene Composites.
abstract: Hydrophobically capped nanocrystals of formamidinium lead bromide (FAPbBr3) perovskite (PNC) show bright and stable fluorescence in solution and thin-film states. When compared with isolated PNCs in a solution, close-packed PNCs in a thin film show extended fluorescence lifetime (ca. 4.2 μs), which is due to hopping or migration of photogenerated excitons among PNCs. Both fluorescence quantum efficiency and lifetime decrease in a PNC thin film doped with fullerene (C60), which is attributed to channeling of exciton migration into electron transfer to C60. On the other hand, quenching of fluorescence intensity of a PNC solution is not accompanied by any change in fluorescence lifetime, indicating static electron transfer to C60adsorbed onto the hydrophobic surface of individual PNCs. Exciton migration among close-packed PNCs and electron transfer to C60places C60-doped PNC thin films among cost-effective antenna systems for solar cells.
authors.affiliation: Research Institute for Electronic Science and Graduate School of Environmental Science, Hokkaido University, N20, W10, Sapporo, Hokkaido, 001-0020, Japan.|Photosciences and Photonics Section, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, 695 019, India.|Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110 001, India.
authors.forename: Vijayakumar C
authors.initials: VC
authors.lastname: Nair
authors.affiliation: Photosciences and Photonics Section, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, 695 019, India.|Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110 001, India.
authors.forename: Chinnadurai
authors.initials: C
authors.lastname: Muthu
authors.affiliation: Department of Physics and Materials Science & Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China.
authors.forename: Andrey L
authors.initials: AL
authors.lastname: Rogach
authors.affiliation: Research Institute for Electronic Science and Graduate School of Environmental Science, Hokkaido University, N20, W10, Sapporo, Hokkaido, 001-0020, Japan.
authors.forename: Reiko
authors.initials: R
authors.lastname: Kohara
authors.affiliation: Research Institute for Electronic Science and Graduate School of Environmental Science, Hokkaido University, N20, W10, Sapporo, Hokkaido, 001-0020, Japan.|Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Takamatsu, 761-0395, Japan.
authors.forename: Vasudevanpillai
authors.initials: V
authors.lastname: Biju
keywords: electron transfer; exciton migration; fluorescence quenching; fullerenes; perovskite nanocrystals