Dataset Information

Carrier Dynamics of Efficient Triplet Harvesting in AgBiS₂ /Pentacene Singlet Fission Solar Cells.

ABSTRACT: Singlet fission is a process by which an organic semiconductor is able to generate two triplet excitons from a single photon. If charges from the triplets can be successfully harvested without heavy losses in energy, then this process can enable a single-junction solar cell to surpass the Shockley-Queisser limit. While singlet fission processes are commonly observed in several materials, harvesting the resulting triplets is difficult and has been demonstrated with only a few transport materials. Here, transient absorption spectroscopy is used to investigate singlet fission and carrier transfer processes at the AgBiS₂ /pentacene (AgBiS₂ /Pc) heterojunction. The successful transfer of triplets from pentacene to AgBiS₂ and the transfer of holes from AgBiS₂ to pentacene is observed. Further singlet fission in pentacene by modifying the crystallinity of the pentacene layer and have fabricated the first singlet fission AgBiS₂ /Pc solar cell is enhanced. Singlet fission devices exhibit higher external quantum efficiency compared with the control devices, and thus demonstrating the significant contribution of charges from the singlet fission process.

SUBMITTER: Geng P

PROVIDER: S-EPMC10161067 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature

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Publications

Carrier Dynamics of Efficient Triplet Harvesting in AgBiS<sub>2</sub> /Pentacene Singlet Fission Solar Cells.

Geng Pai P Chen Dezhang D Shivarudraiah Sunil B SB Chen Xihan X Guo Liang L Halpert Jonathan E JE

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20230320 13

Singlet fission is a process by which an organic semiconductor is able to generate two triplet excitons from a single photon. If charges from the triplets can be successfully harvested without heavy losses in energy, then this process can enable a single-junction solar cell to surpass the Shockley-Queisser limit. While singlet fission processes are commonly observed in several materials, harvesting the resulting triplets is difficult and has been demonstrated with only a few transport materials. ...[more]

PMID: 36938855

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Project description:Singlet fission is an exciton multiplication process in organic molecules in which a photogenerated spin-singlet exciton is rapidly and efficiently converted to two spin-triplet excitons. This process offers a mechanism to break the Shockley-Queisser limit by overcoming the thermalization losses inherent to all single-junction photovoltaics. One of the most promising methods to harness the singlet fission process is via the efficient extraction of the dark triplet excitons into quantum dots (QDs) where they can recombine radiatively, thereby converting high-energy photons to pairs of low-energy photons, which can then be captured in traditional inorganic PVs such as Si. Such a singlet fission photon multiplication (SF-PM) process could increase the efficiency of the best Si cells from 26.7% to 32.5%, breaking the Shockley-Queisser limit. However, there has been no demonstration of such a singlet fission photon multiplication (SF-PM) process in a bulk system to date. Here, we demonstrate a solution-based bulk SF-PM system based on the singlet fission material TIPS-Tc combined with PbS QDs. Using a range of steady-state and time-resolved measurements combined with analytical modeling we study the dynamics and mechanism of the triplet harvesting process. We show that the system absorbs >95% of incident photons within the singlet fission material to form singlet excitons, which then undergo efficient singlet fission in the solution phase (135 ± 5%) before quantitative harvesting of the triplet excitons (95 ± 5%) via a low concentration of QD acceptors, followed by the emission of IR photons. We find that in order to achieve efficient triplet harvesting it is critical to engineer the surface of the QD with a triplet transfer ligand and that bimolecular decay of triplets is potentially a major loss pathway which can be controlled via tuning the concentration of QD acceptors. We demonstrate that the photon multiplication efficiency is maintained up to solar fluence. Our results establish the solution-based SF-PM system as a simple and highly tunable platform to understand the dynamics of a triplet energy transfer process between organic semiconductors and QDs, one that can provide clear design rules for new materials.

Dataset Information

Carrier Dynamics of Efficient Triplet Harvesting in AgBiS₂ /Pentacene Singlet Fission Solar Cells.

Publications

Carrier Dynamics of Efficient Triplet Harvesting in AgBiS<sub>2</sub> /Pentacene Singlet Fission Solar Cells.

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Carrier Dynamics of Efficient Triplet Harvesting in AgBiS2 /Pentacene Singlet Fission Solar Cells.

Publications

Carrier Dynamics of Efficient Triplet Harvesting in AgBiS<sub>2</sub> /Pentacene Singlet Fission Solar Cells.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Carrier Dynamics of Efficient Triplet Harvesting in AgBiS₂ /Pentacene Singlet Fission Solar Cells.