Design of a Fully Non‐Fused Bulk Heterojunction toward Efficient and Low‐Cost Organic Photovoltaics

Ma, Lijiao; Zhang, Shaoqing; Ren, Junzhen; Wang, Guanlin; Li, Jiayao; Chen, Zhihao; Yao, Huifeng; Hou, Jianhui

doi:10.1002/anie.202214088

Cited by 72 publications

(60 citation statements)

References 54 publications

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“…For the PDCBT‐2F:Tz‐based device, the best PCE reaches 13.3% with a V OC of 0.88 V, a J SC of 21.1 mA cm −2 , and an FF of 71.8%, which is an outstanding result for the low‐cost combination based on polythiophene donor and non‐fused NFA. Moreover, PDCBT‐2F:Tz is very cost‐effective with an average figure of merit (AFOM) of 2.8, which is superior to many frequently seen donor:acceptor systems and comparable with a polythiophene:NFA combination in our recent report [ 47 ] in Table S3 (Supporting Information). We tested the stability of the devices.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Intermolecular Electrostatic Interaction toward High‐Efficiency and Low‐Cost Organic Solar Cells

Yao

et al. 2023

Adv Funct Materials

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Organic solar cells (OSCs) have achieved much progress with rapidly increasing power conversion efficiencies (PCEs). It should be noted that the top-performance OSCs are generally consisted of active materials with complex chemical structures, resulting in high costs. Here, combining the material design and morphology control, high-efficiency OSCs are fabricated by a low-cost donor: acceptor blend. A completely non-fused electron acceptor named Tz is designed and synthesized via introducing thiazole units on both sides of a bithiophene core, which shows an outstanding PCE of 13.3% with a typical polythiophene donor. More importantly, optimization guidelines are presented to get excellent morphology for low-cost donor:acceptor systems. Three polythiophenes are selected, poly(3-hexylthiophene) and its two derivatives with electron-withdrawing substitutions (PDCBT and PDCBT-2F), as donors to fabricate the cell devices. The computational and experimental data reveal that decreasing the electrostatic interaction between polythiophene and Tz is the key to getting a suppressed miscibility and thus a high phase purity. This study provides insight into the molecular design and donor:acceptor matching requirements for high-efficiency and low-cost OSCs.

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Section: Resultsmentioning

confidence: 99%

Tuning the Intermolecular Electrostatic Interaction toward High‐Efficiency and Low‐Cost Organic Solar Cells

Yao

et al. 2023

Adv Funct Materials

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“…Among them, PM6:PZC24 shows the lowest χ D,A value of 0.017κ (Figure 4i; and Table S9, Supporting Information), indicating high interfacial compatibility and a low enthalpy of mixing (Δ H mix ) between P D and P A . [ 63 ] However, CH‐D1 shows weaker miscible with whether PM6 or PZC24, demonstrating it can effectively reduce the D:A miscibility, which may be favorable for the higher domain purity and FF in ternary blend film. In addition, we studied the surface energy of blended film of PZC24 and CH‐D1 to verify the miscibility for the PM6:PZC24:CH‐D1 system.…”

Section: Resultsmentioning

confidence: 99%

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Zhang

Chen

et al. 2023

Advanced Energy Materials

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(2 of 10)that of SMAs limits the short-circult current densities (J SC s), and the unfavorable morphology caused by large conjugated lengths ang high molecular weights of P A and P D materials tends to suppress the fill factors (FFs). [38][39][40][41][42] To solve these issues, "polymerized small molecule acceptor" (PSMA) strategy, [43,44] ternary strategy, [45] and device engineering [30,31,33,46] are considered as efficient approaches to be developed continually. Among various device optimization methods, fabricating the ternary blends has been proved as an advantageous and simple strategy to uplift device performance. It is worth noting that the third component plays an important role in enhancing light absorption, facilitating charge transfer, and optimizing nanoscale morphology in the ternary systems. [34,47] In previous work on all-PSCs, the third components could be P D s, P A s, or small molecule acceptors. [26,29,34,48,49] For example, the strategy of choosing a similar P A to the host one in chemical structure as the third component was reported by Min et al., which improved PCE and stability simultaneously. [24] Recently, Hou and co-workers introduced PM6 with a high molecular weight into the all-PSCs system to afford efficient pathways for charge transport and mechanical stress dissipation, so that the ternary device demonstrated the PCE of 18.2% with outstanding mechanical properties. [26] However, because of the difficulty to alter morphology in all-PSCs devices, it is rather challenging to find proper third components, especially a universal one. Recently, Wei et al. reported a "N-π-N" type oligomeric acceptor, which falls in between SMA and P A and inherited the advantages of both them. Compared to its corresponding SMA, it performed higher tolerance for additive contents, as well as superior stability. While compared to its polymeric counterparts, it could obtain definite molecular structure, increased extinction coefficient, and absence of chains entanglements. [42] However, the oligomeric acceptors have not been considered to introduce in all-PSCs systems so far. [40,[50][51][52][53] Based on this point, it is urgent and significative to study the influence of an oligomeric acceptor as the third component on the performance and mechanical robustness in all-PSCs systems.With these in mind, we designed and synthesized a polymer acceptor (named PZC24) through linking CH-series SMA [54][55][56] by the fluoro-substituted thiophene π bridge. By blending PZC24 with the polymer donor PM6, a decent PCE of 16.82% is achieved. Furthermore, an "N-π-N" type oligomeric acceptor (CH-D1), which has the same core blocks (N type) and linking units (π bridge) as PZC24, was designed and added in PM6:PZC24 system as the third component. Based on the same structure, CH-D1 can be referred as "twins" molecule with PZC24. Therefore, this ternary strategy avoids the complicated selection and additional synthesis for the third component. More importantly, the introduction of CH-D1 leads to stronger crystallinity and more...

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“…Moreover, the high R q value of the CB-processed film could also lead to voids at the film interface, thus impeding carrier transport and resulting in a low J SC . , On the other hand, the AFM phase image of the CS 2 -processed film demonstrated appropriate phase separation domains, and the CB- and CF-processed films exhibited more small phase separation domains after thermal aging as shown in Figure . The variance in the morphology change is part of the reason causing the stability issue of the OPV cell . Further, Raman mapping was performed for the blends after thermal aging (Figure d–f).…”

Section: Resultsmentioning

confidence: 99%

Efficient and Thermally Stable Organic Solar Cells via a Fully Halogen-Free Active Blend and Solvent

Zhao

Yin

et al. 2023

ACS Appl. Energy Mater.

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The state-of-the-art organic solar cells (OSCs) are basically based on halogenated active materials and solvents. However, halogens/halides could be detrimental to the stability of OSCs due to their corrosiveness to the interface and the electrode. On the other hand, the introduction of halogens, especially the use of halogen solvents, could cause hazards to the environment, further limiting the application of OSCs. Thus, it is meaningful to explore and develop efficient and stable OSCs based on halogen-free materials and solvents. It is demonstrated that fully halogen-free OSCs deliver efficient performance as well with an efficiency of 10.42%, based on the nonhalogenated active blend PBDB-T:ITIC and the nonhalogenated processing solvent CS2. More importantly, superior thermal stability is achieved for the halogen-free cells, with 95% of the initial efficiency retained in 1400 h under 85 °C in a N2 atmosphere, due to the stabilized blend morphology and impeded corrosion of the metal electrode. These results provide insights into the thermal degradation of OSCs and suggest possible rules/directions for the design of active materials and selection of solvents to achieve efficient and thermally stable OSCs.

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Design of a Fully Non‐Fused Bulk Heterojunction toward Efficient and Low‐Cost Organic Photovoltaics

Cited by 72 publications

References 54 publications

Tuning the Intermolecular Electrostatic Interaction toward High‐Efficiency and Low‐Cost Organic Solar Cells

Tuning the Intermolecular Electrostatic Interaction toward High‐Efficiency and Low‐Cost Organic Solar Cells

Oligomeric Acceptor Enables High‐Performance and Robust All‐Polymer Solar Cells with 17.4% Efficiency

Efficient and Thermally Stable Organic Solar Cells via a Fully Halogen-Free Active Blend and Solvent

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