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Cool carriers: triplet diffusion dominates upconversion yield
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DOI：10.1039/d3nr04446g.png)
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Abstract
En 中文
Perovskites have gained popularity both as the active material in photovoltaics and as bulk triplet sensitizers for solid-state triplet-triplet annihilation upconversion (TTA-UC). Prior to widespread implementation into commercial photovoltaics, an in-depth understanding of the environmental influences on device performance is required. To this point, the temperature-dependent structure-function properties of TTA-UC within methylammonium formamidinium lead triiodide (MAFA)/rubrene UC devices are explored. A strong temperature dependence of the underlying UC dynamics is observed, where the maximum UC efficiency is achieved at 170 K, reflecting the competition between triplet diffusion length, diffusion rate, and triplet-triplet encounter events. A combination of spectroscopic and structural methods and theoretical modelling illustrates that despite the significantly increased carrier lifetime of the perovskite at low temperatures, the TTA-UC dynamics are not governed by the underlying sensitizer properties but rather limited by the underlying triplet diffusion. Temperatures below ambient room temperature (298 K) are ideal for perovskite-sensitized upconversion devices where maximum efficiency is reached at 170 K. Here, the underlying triplet diffusion rate governs the overall upconversion dynamics.
Keywords:
SILICON SOLAR-CELLS
2ND-HARMONIC GENERATION
ENERGY-TRANSFER
LEAD IODIDE
ANNIHILATION
SINGLET
FISSION
PHOTOLUMINESCENCE
PROSPECTS
PAIR
Journal
IF:
5.1
Papers:
3.0W
Citations:
11.6W
