TY - JOUR
T1 - Ultrafast Triplet Generation at the Lead Halide Perovskite/Rubrene Interface
AU - Conti, Carl R.
AU - Bieber, Alexander S.
AU - VanOrman, Zachary A.
AU - Moller, Gregory
AU - Wieghold, Sarah
AU - Schaller, Richard D.
AU - Strouse, Geoffrey F.
AU - Nienhaus, Lea
N1 - Funding Information:
A.S.B., Z.A.V., G.M., and L.N. acknowledge funding by Florida State University. C.R.C. and G.F.S. acknowledge the National Science Foundation under Grant No. DMR-1905757. This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
Publisher Copyright:
© 2022 American Chemical Society
PY - 2022/2/11
Y1 - 2022/2/11
N2 - Triplet sensitization of rubrene by bulk lead halide perovskites has recently resulted in efficient infrared-to-visible photon upconversion via triplet-triplet annihilation. Notably, this process can occur under solar relevant fluxes, potentially paving the way toward integration with photovoltaic devices. In order to further improve the upconversion efficiency, the fundamental photophysical pathways at the perovskite/rubrene interface must be clearly understood to maximize charge extraction. Here, we utilize ultrafast transient absorption spectroscopy to elucidate the processes underlying triplet generation at the perovskite/rubrene interface. Our results point to a triplet generation mechanism based on hot carriers; thermally excited charge carriers in the perovskite cool more rapidly in the presence of rubrene, suggesting rapid extraction of these thermally excited carriers on the picosecond time scale. Subsequent triplet formation in rubrene is observed on a subnanosecond time scale.
AB - Triplet sensitization of rubrene by bulk lead halide perovskites has recently resulted in efficient infrared-to-visible photon upconversion via triplet-triplet annihilation. Notably, this process can occur under solar relevant fluxes, potentially paving the way toward integration with photovoltaic devices. In order to further improve the upconversion efficiency, the fundamental photophysical pathways at the perovskite/rubrene interface must be clearly understood to maximize charge extraction. Here, we utilize ultrafast transient absorption spectroscopy to elucidate the processes underlying triplet generation at the perovskite/rubrene interface. Our results point to a triplet generation mechanism based on hot carriers; thermally excited charge carriers in the perovskite cool more rapidly in the presence of rubrene, suggesting rapid extraction of these thermally excited carriers on the picosecond time scale. Subsequent triplet formation in rubrene is observed on a subnanosecond time scale.
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U2 - 10.1021/acsenergylett.1c02732
DO - 10.1021/acsenergylett.1c02732
M3 - Article
AN - SCOPUS:85123960260
SN - 2380-8195
VL - 7
SP - 617
EP - 623
JO - ACS Energy Letters
JF - ACS Energy Letters
IS - 2
ER -
