Dilution effect for highly efficient multiple-component organic solar cells

Zuo, Lijian; Jo, Sae Byeok; Li, Yaokai; Meng, Yuhuan; Stoddard, Ryan J.; Liu, Yun; Lin, Francis; Shi, Xueliang; Liu, Feng; Hillhouse, Hugh W.; Ginger, David S.; Chen, Hongzheng; Jen, Alex K.‐Y.

doi:10.1038/s41565-021-01011-1

Cited by 115 publications

(108 citation statements)

References 45 publications

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“…The introduction of asymmetric BO-5Cl results in more diverse D:A intermolecular conformations, which will balance the charge generation and charge recombination. Besides of the dilution effect 6 , the ternary blends (polymer donor with two different acceptors) could also construct diverse molecular conformations when an asymmetric molecule is added as the third component, which might show the similar effect as the asymmetric molecule appearing in the binary blend. Our findings validate the rationale of using asymmetric acceptors to achieve high luminescence and faster charge transfer for high-performance ternary-blend organic photovoltaic devices.…”

Section: Resultsmentioning

confidence: 99%

Asymmetric electron acceptor enables highly luminescent organic solar cells with certified efficiency over 18%

et al. 2022

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Enhancing the luminescence property without sacrificing the charge collection is one key to high-performance organic solar cells (OSCs), while limited by the severe non-radiative charge recombination. Here, we demonstrate efficient OSCs with high luminescence via the design and synthesis of an asymmetric non-fullerene acceptor, BO-5Cl. Blending BO-5Cl with the PM6 donor leads to a record-high electroluminescence external quantum efficiency of 0.1%, which results in a low non-radiative voltage loss of 0.178 eV and a power conversion efficiency (PCE) over 15%. Importantly, incorporating BO-5Cl as the third component into a widely-studied donor:acceptor (D:A) blend, PM6:BO-4Cl, allows device displaying a high certified PCE of 18.2%. Our joint experimental and theoretical studies unveil that more diverse D:A interfacial conformations formed by asymmetric acceptor induce optimized blend interfacial energetics, which contributes to the improved device performance via balancing charge generation and recombination.

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Section: Resultsmentioning

confidence: 99%

Asymmetric electron acceptor enables highly luminescent organic solar cells with certified efficiency over 18%

et al. 2022

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“…The recent prosperity of NFAs with diverse molecular structures provides more options for the selection of guest materials and thus offers numerous possibilities for developing ternary systems. [ 13,40,41 ] In particular, Jen and co‐workers presented the “dilution effect” as the mechanism for ternary OSCs, [ 42 ] which has been confirmed in many ternary systems based on two similar acceptors. [ 35,43–46 ] Thus, considering the abovementioned four criteria and these circumstances, the design and synthesis of two NFAs with similar molecular structures but different absorption spectra should be a rational strategy to satisfy the selection criteria.…”

Section: Introductionmentioning

confidence: 98%

Single‐Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor

et al. 2022

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“…Bulk heterojunction (BHJ) organic solar cells (OSCs) have been considered as one of the most promising power generation technologies, owing to their low-cost, flexibility, light-weight, and solution-process properties. [1][2][3][4][5][6] The advances of acceptordonor-acceptor (A-D-A) type small molecular acceptors (SMAs) since 2015 have brought in impressive opportunities for OSCs. [7] Owing to the Y6-series acceptors, the power conversion efficiencies (PCE) have surpassed 18% in single BHJ devices.…”

Section: Introductionmentioning

confidence: 99%

Manipulating the Intermolecular Interactions through Side Chain Engineering and Unilateral π‐Bridge Strategy for Efficient Small Molecular Photovoltaic Acceptor

Wang

et al. 2022

Adv Funct Materials

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Thanks to the development of acceptor–donor–acceptor (A–D–A) type electron acceptors, organic solar cells (OSCs) have achieved marvelous progress in recent years. However, a systematic investigation about the structure–efficiency relationship is still highly desired to better understand the working mechanisms inside a bulk heterojunction (BHJ). In this study, new acceptors with the synergistic effect of side chain and unilateral π‐bridge strategy are designed, accounting for lower energy loss, expanded absorption, modulated intermolecular interactions and BHJ morphology. As a consequence, the resultant A–D–π–A acceptor ID‐C6Ph‐ST‐4F based binary solar cell receives an impressive efficiency up to 15.36%, much greater than the A–D–A analog ID‐C6Ph‐4F (10.75%), and ranks the best among all small molecular acceptors with symmetric or asymmetric π‐bridges. The results highlight the promising manipulation of phenylalkyl side chain and unilateral π‐bridge on intermolecular interactions among acceptor molecules and interactions between donor and acceptor (D/A) molecules. Superior interactions among acceptor molecules are an essential precondition to ensure preferable molecular assembly for charge transport, and meanwhile, moderately enhanced D/A interactions are also crucial for proper phase‐separation networks with efficient exciton dissociation and charge generation.

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Dilution effect for highly efficient multiple-component organic solar cells

Cited by 115 publications

References 45 publications

Asymmetric electron acceptor enables highly luminescent organic solar cells with certified efficiency over 18%

Asymmetric electron acceptor enables highly luminescent organic solar cells with certified efficiency over 18%

Single‐Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor

Manipulating the Intermolecular Interactions through Side Chain Engineering and Unilateral π‐Bridge Strategy for Efficient Small Molecular Photovoltaic Acceptor

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