Understanding and Suppressing Non‐Radiative Recombination Losses in Non‐Fullerene Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(35)

Published: May 19, 2023

Abstract Organic solar cells benefit from non‐fullerene acceptors (NFA) due to their high absorption coefficients, tunable frontier energy levels, and optical gaps, as well relatively luminescence quantum efficiencies compared fullerenes. Those merits result in yields of charge generation at a low or negligible energetic offset the donor/NFA heterojunction, with over 19% achieved for single‐junction devices. Pushing this value significantly 20% requires an increase open‐circuit voltage, which is currently still below thermodynamic limit. This can only be by reducing non‐radiative recombination, hereby increasing electroluminescence efficiency photo‐active layer. Here, current understanding origin decay, accurate quantification associated voltage losses are summarized. Promising strategies suppressing these highlighted, focus on new material design, optimization donor–acceptor combination, blend morphology. review aims guiding researchers quest find future harvesting blends, combine yield exciton dissociation radiative free carrier recombination losses, closing gap inorganic perovskite photovoltaics.

Language: Английский

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Refining acceptor aggregation in nonfullerene organic solar cells to achieve high efficiency and superior thermal stability

Science China Chemistry, Journal Year: 2022, Volume and Issue: 66(1), P. 202 - 215

Published: Nov. 23, 2022

Language: Английский

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18.9% Efficiency Ternary Organic Solar Cells Enabled by Isomerization Engineering of Chlorine‐Substitution on Small Molecule Donors

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(30)

Published: April 17, 2023

Abstract Ternary organic solar cells (OSCs) represent an efficient and facile strategy to further boost the device performance. However, selection criteria rational design of third guest small molecule (SM) material still remain less understood. In this study, two new SM donor isomers, with α‐chlorinated thiophene (αBTCl) β‐chlorinated (βBTCl) as side chains, are systematically designed, synthesized incorporated a component in PM6:L8‐BO binary blends. It is noticed that introducing donors has extended absorption photo‐active layer, induced desired distribution vertically enhanced crystallinity reduced recombination process, leading increased short‐circuit current ( J SC ) improved fill factor. Moreover, due synergetic suppressed nonradiative loss preferable morphology, ternary OSCs feature improves open‐circuit voltage V OC ). Consequently, impressive champion power conversion efficiency 18.96% 18.55% achieved by αBTCl‐based βBTCl‐based OSCs, respectively. Furthermore, record 17.46% obtained 330 nm thickness OSCs. This study demonstrates molecular isomerization can be promising approach for construct high‐performance simultaneous enhancement all photovoltaic parameters.

Language: Английский

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Recent Advances in Single‐Junction Organic Solar Cells

Angewandte Chemie, Journal Year: 2022, Volume and Issue: 134(37)

Published: July 20, 2022

Abstract Single‐junction organic solar cells (OSCs) have made significant progress in recent years. Innovations material design and device optimization improved the power conversion efficiencies to over 19 %. In this Minireview, based on advances, we discuss molecular strategies tune absorption spectrum, energy level, intermolecular aggregation as well highlight role of electrostatic potential decreasing loss. Then, introduce latest four types OSCs composed different donor:acceptor combinations: polymer donor:small‐molecule acceptor, all‐polymer, all‐small‐molecule, small‐molecule donor:polymer acceptor. Finally, challenges practical applications, including cost, stability, multi‐function integration, are discussed.

Language: Английский

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A structurally simple linear conjugated polymer toward practical application of organic solar cells

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(11), P. 4789 - 4797

Published: Jan. 1, 2022

PTTzF, a linear conjugated polymer donor featuring simple synthesis, high device efficiency, outstanding batch reproducibility, and good universality with different acceptors is promising candidate for practical application of organic solar cells.

Language: Английский

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