Triplet-Sensitization by Lead Halide Perovskite Thin Films for Near-Infrared-to-Visible Upconversion
Name
Triplet-Sensitization by Lead Halide Perovskite Thin Films for Near-Infrared-to-Visible Upconversion.pdf
Description
Accepted version
Size
1.46 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Nienhaus, Lea
Correa-Baena, Juan-Pablo
Wieghold, Sarah
Einzinger, Markus
Lin, Ting-An
Shulenberger, Katherine
Klein, Nathan
Wu, Mengfei
Bulovic, Vladimir
Buonassisi, Tonio
Date Issued
March 22, 2019
Journal
ACS Energy Letters
Publisher
American Chemical Society (ACS)
Citation
Nwinhaus, Lea et al. "Triplet-Sensitization by Lead Halide Perovskite Thin Films for Near-Infrared-to-Visible Upconversion." ACS Energy Letters 4, 4 (March 2019): 888-895 © 2019 American Chemical Society
Version
Author's final manuscript
Abstract
Lead halide-based perovskite thin films have attracted great attention due to the rapid increase in perovskite solar cell efficiencies. The same optoelectronic properties that make perovskites ideal absorber materials in solar cells are also beneficial in other light-harvesting applications and make them prime candidates as triplet sensitizers in upconversion via triplet-triplet annihilation in rubrene. In this contribution, we take advantage of long carrier lifetimes and carrier diffusion lengths in perovskite thin films, their high absorption cross-sections throughout the visible spectrum, and the strong spin-orbit coupling owing to the abundance of heavy atoms to sensitize the upconverter rubrene. Employing bulk perovskite thin films as the absorber layer and spin-mixer in inorganic/organic heterojunction upconversion devices allows us to forego the passivating ligands required for colloidal sensitizers, which can hinder exciton transport through large scale arrays and reduce the triplet transfer efficiency to the annihilator. Our bilayer device exhibits an upconversion efficiency in excess of 3% under 785 nm illumination at an incident power of ∼88 W/cm[superscript 2]. Keywords: lead halide perovskites; upconversion; free carriers; triplet excitons; charge-separated state; triplet-charge annihilation; triplet-triplet annihilation
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1021/acsenergylett.9b00283
