Simultaneous Enhancement of Three Parameters of P3HT‐Based Organic Solar Cells with One Oxygen Atom

Wu, Jianfei; Xu, Yunxiao; Yang, Zhou; Chen, Yu‐Sheng; Sui, Xinyu; Yang, Lei; Ye, Pan; Tao, Zhu; Wu, Xiaoxi; Liu, Xinfeng; Cao, Hui; Peng, Aidong; Huang, Hui

doi:10.1002/aenm.201803012

Cited by 57 publications

(51 citation statements)

References 49 publications

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“…To tackle this issue, non‐fullerene acceptors (NFAs) with tunable energy and various structure have emerged and achieved rapid progress . Figure summarized the obtained PCE under varied V OC values (Figure a) and the relationship between V OC and E loss (Figure b), where over fifty reported OSCs are involved, related references have been listed in Supporting Information.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

et al. 2019

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Summary of main observation and conclusion One of the most important challenges that hinders the power conversion efficiencies (PCEs) of organic solar cells (OSCs) is the modest open‐circuit voltages (VOC) due to large energy losses. The large driving force during for charge generation and the non‐radiative recombination are the main causes of energy losses. To maximize the VOC of OSCs, herein, we modulate the end‐groups and design a non‐fullerene acceptor ITCCM‐O, which shows a bandgap of 2.0 eV. By blending a polymer donor named J52, the device demonstrates a PCE of 5.5% with an outstanding VOC of 1.34 V, which is the highest value for single‐junction OSCs over 5% PCEs. The high VOC is benefited from 1) the negligible driving force for charge transfer, and 2) the suppressed non‐radiative recombination loss, as low as 0.22 V.

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Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

et al. 2019

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“…Attempts to control molecular conformation take two approaches, processing control or molecular structure design. [26,27] Tang and coworkers include hexyl side chains that hinder rotation about the D-A dihedral, leading to a favored conformation and weaker π-π stacking that in this instance improves compatibility with the donor polymer. [21] Molecular structure design takes advantage of noncovalent intramolecular interactions that favor a certain conformation; for example, sulfur-fluorine interactions are known to increase conjugated backbone planarity of D-A copolymers, leading to higher crystallinity and charge carrier mobility.…”

Section: Introductionmentioning

confidence: 99%

Twist and Degrade—Impact of Molecular Structure on the Photostability of Nonfullerene Acceptors and Their Photovoltaic Blends

Luke

Speller

Wadsworth

et al. 2019

Advanced Energy Materials

107

140

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Nonfullerene acceptors (NFAs) dominate organic photovoltaic (OPV) research due to their promising efficiencies and stabilities. However, there is very little investigation into the molecular processes of degradation, which is critical to guiding design of novel NFAs for long‐lived, commercially viable OPVs. Here, the important role of molecular structure and conformation in NFA photostability in air is investigated by comparing structurally similar but conformationally different promising NFAs: planar O‐IDTBR and nonplanar O‐IDFBR. A three‐phase degradation process is identified: i) initial photoinduced conformational change (i.e., torsion about the core–benzothiadiazole dihedral), induced by noncovalent interactions with environmental molecules, ii) followed by photo‐oxidation and fragmentation, leading to chromophore bleaching and degradation product formation, and iii) finally complete chromophore bleaching. Initial conformational change is a critical prerequisite for further degradation, providing fundamental understanding of the relative stability of IDTBR and IDFBR, where the already twisted IDFBR is more prone to degradation. When blended with the donor polymer poly(3‐hexylthiophene), both NFAs exhibit improved photostability while the photostability of the polymer itself is significantly reduced by the more miscible twisted NFA. The findings elucidate the important role of NFA molecular structure in photostability of OPV systems, and provide vital insights into molecular design rules for intrinsically photostable NFAs.

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“…Yet with O‐IDTBR PCE can be improved up to 6.4%, due to enhanced absorption and optimal morphology . Recently, using conformationally locked FREA ORCN , Huang and co‐workers achieved a record PCE of 6.6% for P3HT‐based OSCs …”

Section: Other Aspects Of Frea Oscsmentioning

confidence: 99%

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

Dey

2019

Small

135

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The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement from ≈2.5% in 2013 to 17.3% in 2018 in OSC performance is primarily credited to novel nonfullerene acceptors (NFA), especially fused ring electron acceptors (FREAs). FREAs offer unique advantages over FAs, like broad absorption of solar radiation, and they can be extensively chemically manipulated to tune optoelectronic and morphological properties. Herein, the current status in FREA‐based OSCs is summarized, such as design strategies for both wide and narrow bandgap FREAs for BHJ, all‐small‐molecule OSCs, semi‐transparent OSC, ternary, and tandem solar cells. The photovoltaics parameters for FREAs are summarized and discussed. The focus is on the various FREA structures and their role in optical and morphological tuning. Besides, the advantages and drawbacks of both FAs and NFAs are discussed. Finally, an outlook in the field of FREA‐OSCs for future material design and challenges ahead is provided.

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Simultaneous Enhancement of Three Parameters of P3HT‐Based Organic Solar Cells with One Oxygen Atom

Cited by 57 publications

References 49 publications

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

Twist and Degrade—Impact of Molecular Structure on the Photostability of Nonfullerene Acceptors and Their Photovoltaic Blends

Recent Progress in Molecular Design of Fused Ring Electron Acceptors for Organic Solar Cells

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