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Title: Hot carrier extraction in CH3NH3PbI3 unveiled by pump-push-probe spectroscopy
Authors: Lim, Swee Sien
Giovanni, David
Zhang, Qiannan
Solanki, Ankur
Nur Fadilah Jamaludin
Lim, Melvin Jia Wei
Mathews, Nripan
Mhaisalkar, Subodh
Pshenichnikov, Maxim S.
Sum, Tze Chien
Keywords: Science::Physics
Issue Date: 2019
Source: Lim, S. S., Giovanni, D., Zhang, Q., Solanki, A., Nur Fadilah Jamaludin, Lim, M. J. W., ... Sum, T. C. (2019). Hot carrier extraction in CH3NH3PbI3 unveiled by pump-push-probe spectroscopy. Science Advances, 5(11), eaax3620-. doi:10.1126/sciadv.aax3620
Journal: Science Advances
Abstract: Halide perovskites are promising materials for development in hot carrier (HC) solar cells, where the excess energy of above-bandgap photons is harvested before being wasted as heat to enhance device efficiency. Presently, HC separation and transfer processes at higher-energy states remain poorly understood. Here, we investigate the excited state dynamics in CH3NH3PbI3 using pump-push-probe spectroscopy. It has its intrinsic advantages for studying these dynamics over conventional transient spectroscopy, albeit complementary to one another. By exploiting the broad excited-state absorption characteristics, our findings reveal the transfer of HCs from these higher-energy states into bathophenanthroline (bphen), an energy selective organic acceptor far above perovskite's band edges. Complete HC extraction is realized only after overcoming the interfacial barrier formed at the heterojunction, estimated to be between 1.01 and 1.08 eV above bphen's lowest unoccupied molecular orbital level. The insights gained here are essential for the development of a new class of optoelectronics.
ISSN: 2375-2548
DOI: 10.1126/sciadv.aax3620
DOI (Related Dataset):
Schools: School of Materials Science and Engineering 
School of Physical and Mathematical Sciences 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
Rights: © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S.Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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