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Title: Ultrafast Triplet Generation at the Lead Halide Perovskite/Rubrene Interface

Journal Article · · ACS Energy Letters
 [1];  [1];  [1];  [1];  [2];  [3]; ORCiD logo [1]; ORCiD logo [1]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Florida State Univ., Tallahassee, FL (United States); Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials; Argonne National Lab. (ANL), Lemont, IL (United States). Advanced Photon Source (APS)
  3. Argonne National Lab. (ANL), Lemont, IL (United States). Center for Nanoscale Materials

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. In this work, 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.

Research Organization:
Argonne National Laboratory (ANL)
Sponsoring Organization:
Florida State University; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1894217
Journal Information:
ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 2 Vol. 7; ISSN 2380-8195
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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