Constraints imposed by the sparse solar photon flux on upconversion and hot carrier solar cells

Sharma, Abhinav; Pusch, Andreas; Nielsen, Michael P.; Römer, Udo; Tayebjee, Murad J. Y.; Rougieux, Fiacre; Ekins‐Daukes, Nicholas J.

doi:10.1016/j.solener.2022.03.037

Cited by 3 publications

(2 citation statements)

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“…Consequently, rapid carrier equilibration is essential for highly efficient carrier extraction. 23,55,56) The required τ eq is shorter than one-hundredth of the carrier thermalization time (τ th ) at least. 16) Considering that a larger n c leads to a shorter τ eq , the target condition is n c > 10 14 cm −3 and τ eq < 10 ps assuming τ th = 1 ns; 42,57) note that n c is proportional to the carrier retention time from the photogeneration to the extraction, which is of the same order of magnitude as τ th .…”

Section: Conventional Solar Cellsmentioning

confidence: 99%

Effects of impact ionization and Auger recombination on hot-carrier solar cells and hot-carrier photocatalysts

Takeda

Sato

Morikawa

2023

Jpn. J. Appl. Phys.

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We applied hot-carrier extraction to solar cells and photocatalysts used for artificial photosynthesis including water splitting and CO2 reduction, and elucidated the differences between these two applications: hot-carrier solar cells (HC-SCs) and hot-carrier photocatalysts (HC-PCs) by detailed balance calculations. The hot-carrier effect in the photocatalysts is less significant than that in the solar cells, because of the larger bandgaps required for generating sufficiently high-energy carriers consumed for the reactions. On the other hand, impact ionization and Auger recombination (IA) improves the efficiency of the HC-PCs more notably, because the IA functions like photon upconverters and hence narrows the optimal bandgap. Furthermore, the IA improves the spectral robustness by eliminating the constraint of the particle-number conservation for both the HC-SCs and HC-PCs. These benefits of the IA are contrasting to the well-recognized fact that the IA only reduces the carrier number and consequently lowers the efficiency of the conventional counterparts.

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Section: Conventional Solar Cellsmentioning

confidence: 99%

Effects of impact ionization and Auger recombination on hot-carrier solar cells and hot-carrier photocatalysts

Takeda

Sato

Morikawa

2023

Jpn. J. Appl. Phys.

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show abstract

“…1) via a long-lived intermediate state through anti-Stokes emission. 16 The concept of upconversion was first introduced by Dutch-American physicist Nicolas Bloembergen in 1959. 17 In theory, it was predicted that with the help of an ideal upconverter, the standard Air Mass 1.5 global (AM 1.5G) spectrum power conversion efficiency can be tuned up to 50.7% from the basic limit of 32%.…”

Section: Introductionmentioning

confidence: 99%