Realizing over 18% Efficiency for M‐Series Acceptor‐Based Polymer Solar Cells by Improving Light Utilization

Advanced Energy Materials, Год журнала: 2024, Номер unknown

Опубликована: Июль 2, 2024

Abstract M‐series molecules are one kind of promising acceptor‐donor‐acceptor (A‐D‐A)‐type acceptors for constructing high‐performance organic solar cells (OSCs). However, their power conversion efficiencies (PCEs) lagging behind that current state‐of‐the‐art OSCs, limited by the relatively low fill factor (FF) and photocurrent. Herein, combined strategies layer‐by‐layer (LBL) deposition interface engineering conducted to systematically improve light utilization thus PCEs M36‐based OSCs. Through choosing a proper processing solvent, PCE 17.3% with an FF 77.9% is achieved resulting LBL devices, much higher than those (15.9%/74.0%) from blend‐casting devices. The improvement assigned favorable morphological evolution facilitates carrier generation transport as well reduces charge recombination. More importantly, light‐harvesting active layers can be enhanced upon employing self‐assembled monolayer (2‐(9H‐carbazol‐9‐yl)ethyl)phosphonic acid (2PACz) instead widely used PEDOT:PSS hole‐selecting layer, due decreased parasitic absorption former. Consequently, 2PACz‐based devices exhibit significantly increased photocurrent, affording up 18.2%, which highest among reported A‐D‐A‐type acceptor‐based These results deliver important enhance performance OSCs highlight great potential practical applications.

Язык: Английский

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Asymmetric small-molecule acceptor enables suppressed electron-vibration coupling and minimized driving force for organic solar cells

Nature Communications, Год журнала: 2025, Номер 16(1)

Опубликована: Фев. 10, 2025

Abstract Minimizing the energy loss, particularly non-radiative loss (Δ E nr ), without sacrificing charge collection efficiency, is key to further improve photovoltaic performance of organic solar cells (OSCs). Herein, we proposed an asymmetric molecular design strategy, via developing alkyl/thienyl hybrid side chain based small molecule acceptors (SMAs) BTP-C11-TBO and BTP-BO-TBO, manipulate intermolecular interactions realize enhanced luminescence efficiency reduced loss. Theoretical experimental results indicate that compared three symmetric SMAs BTP-DC11, BTP-DTBO BTP-DBO, BTP-BO-TBO exhibit repressed electron-vibration coupling Δ . Moreover, nature allows formation multiple D:A interfacial conformations energies, which have made charge-transfer state energies closer strongly absorbing (and emitting) local-exciton state, thus gaining low while maintaining efficient exciton dissociation. Consequently, PM6:BTP-BO-TBO-based OSCs achieve a higher power conversion 19.76%, with high open circuit voltage 0.913 V fill factor 81.17%, profiting from more improved balanced mobility longer carrier lifetime. This work provides ideas suppress nonradiative decay paves way obtain high-performance OSCs.

Язык: Английский

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Theoretical Exploration of the Effects of Conjugated Side Chains on the Photoelectric Properties of Y6-Based Nonfullerene Acceptors

The Journal of Physical Chemistry A, Год журнала: 2025, Номер unknown

Опубликована: Март 13, 2025

With the application of nonfullerene acceptors (NFAs) Y6 and its derivatives, power conversion efficiencies (PCEs) single-junction organic solar cells (OSCs) have exceeded 20%. Side-chain engineering has proven to be an important strategy for optimizing Y6-based NFAs. However, studies on incorporation conjugated side chains into NFAs are still rare, corresponding underlying mechanisms not well understood. In this article, we systematically designed eight molecules based modifications two reported NFAs, involving alterations branched alkyl at different positions thiophene, benzene, bithiophene, benzene-thiophene moieties that serve as chains. Using reliable density functional theory (DFT) time-dependent DFT calculations, obtained key photovoltaic parameters such molecular planarity, dipole moments, electrostatic potential fluctuations, frontier orbitals, exciton binding energy (Eb), singlet–triplet differences (ΔEST), UV–vis absorption spectra these newly The results show rings lateral attached exert noticeable influences their photoelectric properties. Notably, compared prototype T3EH, 2T2EH, 2T3EH, PT2EH, PT3EH, P2EH exhibit enhanced (manifesting increased total oscillator strength) smaller Eb ΔEST values, hinting promising novel

Язык: Английский

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Efficient D1:D2:A ternary all-polymer solar cell with optimized photoactive layer morphology realized by compatible two polymer donor

Optical Materials, Год журнала: 2023, Номер 147, С. 114735 - 114735

Опубликована: Дек. 20, 2023

Язык: Английский

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Regioregular polymerized small-molecule acceptors for high-performance all-polymer solar cells

Journal of Materials Chemistry C, Год журнала: 2023, Номер 11(27), С. 9082 - 9092

Опубликована: Янв. 1, 2023

This review summarizes the recent advances of regioregular polymer acceptors based on SMAs for all-PSCs in past three years, and guidelines future design are discussed.

Язык: Английский

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