Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Wang, Qi; Qin, Yunpeng; Li, Miaomiao; Ye, Long; Geng, Yanhou

doi:10.1002/aenm.202002572

Cited by 94 publications

(75 citation statements)

References 207 publications

(299 reference statements)

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“…[214][215][216][217][218][219] The molecular structure design of PT derivatives has been introduced in detail in our previous articles. [220] Here, we will focus on the influence of molecular engineering on the aggregated structure. In 2011, Zhang et al [219] had synthesized PT derivatives with carboxylate substituent.…”

Section: Polythiophenesmentioning

confidence: 99%

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

et al. 2021

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π-Conjugated organic/polymer materials-based solar cells have attracted tremendous research interest in the fields of chemistry, physics, materials science, and energy science. To date, the best-performance polymer solar cells (PSCs) have achieved power conversion efficiencies exceeding 18%, mostly driven by the molecular design and device structure optimization of the photovoltaic materials. This review article provides a comprehensive overview of the key advances and current status in aggregated structure research of PSCs. Here, we start by providing a brief tutorial on the aggregated structure of photovoltaic polymers. The characteristic parameters at different length scales and the associated characterization techniques are overviewed. Subsequently, a variety of effective strategies to control the aggregated structure of photovoltaic polymers are discussed for polymer:fullerene solar cells and polymer:nonfullerene small molecule solar cells. Particularly, the control strategies for achieving record efficiencies in each type of PSCs are highlighted. More importantly, the in-depth structure-performance relationships are demonstrated with selected examples. Finally, future challenges and research prospects on understanding and optimizing the aggregated structure of photovoltaic polymers and their blends are provided.

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Section: Polythiophenesmentioning

confidence: 99%

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

et al. 2021

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“…Throughout the history of polymer development, poly(3‐hexylthiophene) (P3HT) has been a promising polymer donor candidate for commercial applications in large area OSCs because it can be synthesized on a kg scale with relatively low costs. [ 23 ] Similar to polymer donors, there is also a need to design structurally simple, high‐efficiency, and low‐cost acceptors. Previously, we have proposed synthesis strategies for unfused ring electron acceptors based on intramolecular noncovalent interactions.…”

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Organic Solar Cells Based on a Low‐Cost Fully Non‐Fused Electron Acceptor

Zhou

Lü

et al. 2021

Adv Funct Materials

121

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A series of tetrathiophene‐based fully non‐fused ring acceptors (4T‐1, 4T‐2, 4T‐3, and 4T‐4), which can be paired with the star donor polymer PBDB‐T to fabricate highly efficient organic solar cells are developed. Tailoring the size of lateral chains can tune the solubility and packing mode of acceptor molecules in neat and blend films. It is found that the incorporation of 2‐ethylhexyl chains can effectively change the compatibility with the donor polymer PBDB‐T, and an encouraging power conversion efficiency of 10.15% is accomplished by 4T‐3‐based organic solar cells. It also presents good compatibility with the other polymer donor and an even higher power conversion efficiency (PCE) of 12.04% is achieved based on D18:4T‐3 blend, which is the champion PCE for the fully non‐fused acceptors. Importantly, these inexpensive tetrathiophene fully non‐fused ring acceptors provide cost‐effective photovoltaic performance. The results demonstrate a high photovoltaic performance from synthetically inexpensive materials could be achieved by the rational design of non‐fused ring acceptor molecules.

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“…In the past 5 years, PCEs of 12–16% have been achieved in various NFAs cases via rational designing of the A and D unit chemical structures. [ 1,39–48 ] Very recently, the efficiency has been pushed to ≈18% owing to the development of novel NFAs (Y6 and derivatives) and efficient polymer donors. [ 49 ] Consequently, with the continuous development of efficient photoactive materials, significant progress has been achieved for flexible OSCs in recent years.…”

Section: Introductionmentioning

confidence: 99%

Flexible Organic Solar Cells: Progress and Challenges

et al. 2021

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Compared with inorganic photovoltaic technologies, flexibility is the most prominent feature of organic solar cells (OSCs). Flexible OSCs have been considered as one of the most promising directions in the OSC field, and have drawn tremendous attention in recent years. However, the power conversion efficiencies (PCEs) of flexible OSCs still lag behind those of their rigid counterparts. To further improve the performance of flexible OSCs, it is of great necessity for synergistic efforts to optimize flexible transparent electrodes (FTEs), photoactive materials, electrode buffer layers, and device structure engineering. Herein, the recent progress in flexible OSCs from the perspective of FTEs, including indium tin oxides, carbon nanomaterials, conducting polymers, silver nanowires, and ultrathin metal films and metal meshes, is summarized. In addition, the photoactive materials and electrode buffer layers in flexible OSCs are discussed to reveal the effects of material engineering and interface modification. Finally, a discussion of the future outlook and challenges of flexible OSCs is presented.

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Molecular Engineering and Morphology Control of Polythiophene:Nonfullerene Acceptor Blends for High‐Performance Solar Cells

Cited by 94 publications

References 207 publications

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

Control of aggregated structure of photovoltaic polymers for high‐efficiency solar cells

High‐Efficiency Organic Solar Cells Based on a Low‐Cost Fully Non‐Fused Electron Acceptor

Flexible Organic Solar Cells: Progress and Challenges

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