当三重态无关紧要：洞察其对VOC的影响

IF 19.3 1区材料科学 Q1 CHEMISTRY, PHYSICAL

ACS Energy Letters Pub Date : 2025-04-23 DOI:10.1021/acsenergylett.5c00384

Mohammad Saeed Shadabroo, Nurlan Tokmoldin, Atul Shukla, Acacia Patterson, Tanner M. Melody, Obaid Alqahtani, Brian A. Collins, Dieter Neher, Safa Shoaee

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引用次数: 0

摘要

有机太阳能电池的效率超过20%，受到单线态和三重态电荷转移（CT）态以及局部三重态激子的重组损失的限制，影响开路电压（VOC）。使用PM6:o-IDTBR，实现了非常低的非辐射电压损失，ΔVnr = 160 mV，尽管存在三重态激子(。6 × 1015 cm-3)。在采用本系统作为模型范例中，我们阐明了如果三重态寿命超过CT衰变寿命的情况，则三重态激子解离到CT状态作为一个可行的过程出现。这反过来又有助于减少来自T1状态的额外损耗通道的表现，并使T1的损耗最小化。在PM6:o-IDTBR中，长三重态寿命（10 μs）使三重态解离，并将三重态介导的重组限制在~ 10%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

When the Triplet State Doesn’t Matter: Insights into Its Impact on VOC

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When the Triplet State Doesn’t Matter: Insights into Its Impact on VOC

Organic solar cell efficiency, exceeding 20%, is limited by recombination losses from singlet and triplet charge-transfer (CT) states and local triplet excitons, impacting open-circuit voltage (V_OC). Using PM6:o-IDTBR, a very low nonradiative voltage loss, ΔV_nr = 160 mV, is achieved, despite the presence of triplet excitons (.6 × 10¹⁵ cm^–3). In employing the present system as a model exemplar, we elucidate the circumstance wherein, if the triplet lifetime surpasses the lifetime of the CT decay, the dissociation of triplet excitons to the CT state emerges as a feasible process. This, in turn, serves to reduce the manifestation of an additional loss channel from the T1 state and minimizes losses from T1. In PM6:o-IDTBR, the long triplet lifetime (10 μs) enables dissociation of the triplet state and limits the triplet-mediated recombination to ∼10%.

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来源期刊

ACS Energy Letters Energy-Renewable Energy, Sustainability and the Environment

CiteScore

31.20

自引率

5.00%

发文量

469

审稿时长

1 months

期刊介绍： ACS Energy Letters is a monthly journal that publishes papers reporting new scientific advances in energy research. The journal focuses on topics that are of interest to scientists working in the fundamental and applied sciences. Rapid publication is a central criterion for acceptance, and the journal is known for its quick publication times, with an average of 4-6 weeks from submission to web publication in As Soon As Publishable format. ACS Energy Letters is ranked as the number one journal in the Web of Science Electrochemistry category. It also ranks within the top 10 journals for Physical Chemistry, Energy & Fuels, and Nanoscience & Nanotechnology. The journal offers several types of articles, including Letters, Energy Express, Perspectives, Reviews, Editorials, Viewpoints and Energy Focus. Additionally, authors have the option to submit videos that summarize or support the information presented in a Perspective or Review article, which can be highlighted on the journal's website. ACS Energy Letters is abstracted and indexed in Chemical Abstracts Service/SciFinder, EBSCO-summon, PubMed, Web of Science, Scopus and Portico.