A Chlorinated Donor Polymer Achieving High‐Performance Organic Solar Cells with a Wide Range of Polymer Molecular Weight

Zeng, An‐Ping; Pan, Man; Chen, Yuzhong; Ma, Ruijie; Zhao, Heng; Zhang, Jianquan; Kim, Ha Kyung; Shang, Ao; Luo, Siwei; Angunawela, Indunil; Chang, Yuan; Qi, Zhenyu; Sun, Huiliang; Lai, Joshua Yuk Lin; Ade, Harald; Ma, Wei; Zhang, Fujun; Yan, He

doi:10.1002/adfm.202102413

Cited by 73 publications

(73 citation statements)

References 71 publications

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“…The neat D18-Cl film shows a strong (010) 𝜋-𝜋 stacking peak in the OOP direction at q = 1.63 Å −1 and a (100) lamellar peak in the IP direction at q = 0.32 Å −1 , suggesting its preferential face-on orientation. [20] The neat N3 film also adopts the dominant face-on orientation with an obvious 𝜋-𝜋 stacking peak in the OOP direction at q = 1.73 Å −1 and a (100) lamellar peak in the IP direction at q = 0.30 Å −1 . [12] To explore the vertical phase separation differences among the three blend systems, angle-dependent GIWAXS measurement was performed with the incident angle varied from 0.08°to 0.16°(Figure 4a and Figure S7, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…The neat D18‐Cl film shows a strong (010) π – π stacking peak in the OOP direction at q = 1.63 Å −1 and a (100) lamellar peak in the IP direction at q = 0.32 Å −1 , suggesting its preferential face‐on orientation. [ 20 ] The neat N3 film also adopts the dominant face‐on orientation with an obvious π – π stacking peak in the OOP direction at q = 1.73 Å −1 and a (100) lamellar peak in the IP direction at q = 0.30 Å −1 . [ 12 ]…”

Section: Resultsmentioning

confidence: 99%

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Volatile Solid Additive‐Assisted Sequential Deposition Enables 18.42% Efficiency in Organic Solar Cells

Qin

Yang

et al. 2022

Advanced Science

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Morphology optimization of active layer plays a critical role in improving the performance of organic solar cells (OSCs). In this work, a volatile solid additive‐assisted sequential deposition (SD) strategy is reported to regulate the molecular order and phase separation in solid state. The OSC adopts polymer donor D18‐Cl and acceptor N3 as active layer, as well as 1,4‐diiodobenzene (DIB) as volatile additive. Compared to the D18‐Cl:N3 (one‐time deposition of mixture) and D18‐Cl/N3 (SD) platforms, the D18‐Cl/N3(DIB) device based on DIB‐assisted SD method exhibits a finer phase separation with greatly enhanced molecular crystallinity. The optimal morphology delivers superior charge transport and extraction, offering a champion power conversion efficiency of 18.42% with significantly enhanced short‐circuit current density (Jsc) of 27.18 mA cm−2 and fill factor of 78.8%. This is one of the best performances in binary SD OSCs to date. Angle‐dependent grazing‐incidence wide‐angle X‐ray scattering technique effectively reveals the vertical phase separation and molecular crystallinity of the active layer. This work demonstrates the combination of volatile solid additive and sequential deposition is an effective method to develop high‐performance OSCs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Volatile Solid Additive‐Assisted Sequential Deposition Enables 18.42% Efficiency in Organic Solar Cells

Qin

Yang

et al. 2022

Advanced Science

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“…Herein, we introduced the volatile solid additive DIB into a binary system comprised of a polymer donor, D18‐Cl, [ 54 ] and a small‐molecule acceptor, L8‐BO. [ 12 ] The chemical structures of D18‐Cl, L8‐BO, and DIB are shown in Figure a.…”

Section: Introductionmentioning

confidence: 99%

“…The previously reported HOMO/LUMO of D18‐Cl and L8‐BO are summarized in Figure S1 (Supporting Information). [ 12,54 ] The donor D18‐Cl has a deep HOMO energy level of −5.49 eV, whereas the acceptor, L8‐BO, as a Y6 derivative, adopts a relatively shallower LUMO energy level of −3.90 eV. [ 15 ] Therefore, the binary D18‐Cl/L8‐BO system has a higher theoretical V OC limit than conventional Y6‐based binary systems.…”

Section: Introductionmentioning

confidence: 99%

Pushing the Efficiency of High Open‐Circuit Voltage Binary Organic Solar Cells by Vertical Morphology Tuning

Cai

Xia

et al. 2022

Advanced Science

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The tuning of vertical morphology is critical and challenging for organic solar cells (OSCs). In this work, a high open-circuit voltage (V OC ) binary D18-Cl/L8-BO system is attained while maintaining the high short-circuit current (J SC ) and fill factor (FF) by employing 1,4-diiodobenzene (DIB), a volatile solid additive. It is suggested that DIB can act as a linker between donor or/and acceptor molecules, which significantly modifies the active layer morphology. The overall crystalline packing of the donor and acceptor is enhanced, and the vertical domain sizes of phase separation are significantly decreased. All these morphological changes contribute to exciton dissociation, charge transport, and collection. Therefore, the best-performing device exhibits an efficiency of 18.7% with a V OC of 0.922 V, a J SC of 26.6 mA cm −2 , and an FF of 75.6%. As far as it is known, the V OC achieved here is by far the highest among the reported OSCs with efficiencies over 17%. This work demonstrates the high competence of solid additives with two iodine atoms to tune the morphology, particularly in the vertical direction, which can become a promising direction for future optimization of OSCs.

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“…Dithieno[3',2':3,4;2'',3'':5,6]benzo[1,2-c][1,2,5]thiadiazole (DTBT) is an outstanding electron-withdrawing acceptor unit. Due to its electron-deficiency and good planarity, it has been widely adopted in high-performance donors such as D18, [30][31][32] but the incorporation of the DTBT unit in UFAs has not been reported yet. We believe that the DTBT unit would be a promising candidate in the design of UFAs.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Novel Unfused‐Ring Acceptor for Efficient Organic Solar Cells with Record Open‐Circuit Voltage and Fill Factor

et al. 2022

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Unfused-ring acceptors (UFAs) show bright application prospects in organic solar cells (OSCs) thanks to their easy synthesis, low cost, and good device performance. The selection of central-core building block and suitable side chain are the key factors to achieve high-performance UFAs. Current tremendous endeavors for the development of UFAs mainly concentrate on obtaining higher short-circuit current density (J sc ), albeit accompanied by low open-circuit voltage (V oc ) and modest fill factor (FF). Herein, two novel AÀ DÀ A'À DÀ A type UFAs (BTCD-IC and BTCD-2FIC), which have the same new electron-withdrawing central-core dithieno [3',2':3,4;2'',3'':5,6]-benzo[1,2c][1,2,5]thiadia-zole (DTBT) and cyclopentadithiophene unit (CPDT, substituted by 2-butyl-1-octyl alkyl chain) coupling with different terminals, were designed and synthesized. Two UFAs showed strong and broad light absorption in the wavelength range of 300-850 nm owing to the strong intramolecular charge transfer effect favorable by DTBT core. Compared with BTCD-IC, BTCD-2FIC with F-containing terminal group exhibited higher molar extinction coefficient, lower energy level, higher charge mobility, stronger crystallinity, more ordered molecular stacking, and better film morphology. As a result, when blended with donor polymer PBDB-T (poly [(2,6-(4,8-bis(5-(2-ethylhexyl)), the BTCD-2FIC-based OSC achieved a superior power conversion efficiency (PCE) of 11.32 %, with a high V oc of 0.85 V, a J sc of 18.24 mA cm À 2 , and a FF of 73 %, than BTCD-IC-based OSC (PCE = 8.96 %). Impressively, the simultaneously enhanced V oc and FF values of the PBDB-T:BTCD-2FIC device were the highest values of the AÀ DÀ A'À DÀ A-type UFAs. The results demonstrate the application of electron-withdrawing DTBT central-core unit in efficient UFAs provides meaningful molecular design guidance for high-performance OSCs.

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A Chlorinated Donor Polymer Achieving High‐Performance Organic Solar Cells with a Wide Range of Polymer Molecular Weight

Cited by 73 publications

References 71 publications

Volatile Solid Additive‐Assisted Sequential Deposition Enables 18.42% Efficiency in Organic Solar Cells

Volatile Solid Additive‐Assisted Sequential Deposition Enables 18.42% Efficiency in Organic Solar Cells

Pushing the Efficiency of High Open‐Circuit Voltage Binary Organic Solar Cells by Vertical Morphology Tuning

Exploiting Novel Unfused‐Ring Acceptor for Efficient Organic Solar Cells with Record Open‐Circuit Voltage and Fill Factor

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