Interface property–functionality interplay suppresses bimolecular recombination facilitating above 18% efficiency organic solar cells embracing simplistic fabrication

Peña, Top Archie Dela; Ma, Ruijie; Xing, Zengshan; Qi, Wei; Khan, Jafar Iqbal; Young, Ryan M.; Hai, Yu-Long; García, Sandra Sánchez; Zou, Xinhui; Jin, Zijing; Ng, Fai Lun; Yeung, King Lun; Swearer, Dayne F.; Wasielewski, Michael R.; Wang, Jiannong; Cha, H.; He, Yuehui; Wong, Kam Sing; Li, Gang; Li, Mingjie; Wu, Jinzhu

doi:10.1039/d3ee01427d

Cited by 20 publications

(1 citation statement)

References 59 publications

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“…Driven by novel material development, organic solar cells (OSCs) have recently made tremendous advances in power conversion efficiency (PCE). 1 Benefiting from complementary absorption, favorable bulk-heterojunction morphology and facile charge generation with small energy loss, 2,3 novel non-fullerene acceptors (NFAs) and polymer donors have boosted the PCEs of single-junction OSCs up to 19%. 4–6 Apart from the photosensitive layer, charge-transport interlayers, both the hole-transport layer (HTL) and electron-transport layer also play an important role in achieving high PCEs, good operando -stability, and scalability of OSCs.…”

Section: Introductionmentioning

confidence: 99%

Functionalized nickel oxide as a hole transport layer for organic solar cells with simultaneous enhancement of efficiency and stability

Xiao,

Ren,

Zhang

et al. 2024

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

Functionalized nickel oxide as a hole transport layer for organic solar cells with simultaneous enhancement of efficiency and stability

Xiao,

Ren,

Zhang

et al. 2024

J. Mater. Chem. C

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Isomerization of Benzothiadiazole Yields a Promising Polymer Donor and Organic Solar Cells with Efficiency of 19.0%

Lin,

Hai,

Luo

et al. 2024

Advanced Materials

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The exploration of high‐performance and low‐cost wide‐bandgap polymer donors remains critical to achieve high‐efficiency non‐fullerene organic solar cells (OSCs) beyond current thresholds. Herein, the 1,2,3‐benzothiadiazole (iBT), which is an isomer of 2,1,3‐benzothiadiazole (BT), is used to design wide‐bandgap polymer donor PiBT. The PiBT‐based solar cells reach efficiency of 19.0%, which is one of the highest efficiencies in binary OSCs. Systemic studies show that isomerization of 2,1,3‐benzothiadiazole (BT) to 1,2,3‐benzothiadiazole (iBT) can finely regulate the polymers’ photoelectric properties including (i) increase the extinction coefficient and photon harvest, (ii) down‐shift the highest occupied molecular orbital (HOMO) energy levels, (iii) improve the coplanarity of polymer backbones, (vi) offer good thermodynamic miscibility with acceptors. Consequently, the PiBT:Y6 BHJ device simultaneously reaches advantageous nanoscale morphology, efficient exciton generation and dissociation, fast charge transportation, and suppressed charge recombination, leading to larger VOC of 0.87 V, higher JSC of 28.2 mA·cm−2, greater FF of 77.3%, and thus higher efficiency of 19.0%, while the analogue PBT‐based OSCs reach efficiency of only 12.9%. Moreover, the key intermediate 1,2,3‐benzothiadiazole (iBT) can be easily afforded from industry chemicals via two‐step procedure. Overall, this contribution highlights that 1,2,3‐benzothiadiazole (iBT) is a promising motif for designing high‐performance polymer donors.This article is protected by copyright. All rights reserved

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Correlating Aggregation Ability of Polymer Donors with Film Formation Kinetics for Organic Solar Cells with Improved Efficiency and Processability

Qiu,

Tian,

Zhang

et al. 2024

Advanced Materials

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Film formation kinetics significantly impact the molecular processability and power conversion efficiency (PCE) of organic solar cells (OSCs). In this article, we report two kinds of ternary random copolymerization polymers, D18‐N‐p and D18‐N‐m, to modulate the aggregation ability of the conventional polymer donor D18 by introducing trifluoromethyl substituted pyridine unit at para‐ and meta‐position, respectively. The introduction of the pyridine unit significantly reduced material aggregation ability and adjusted the interactions with acceptor L8‐BO, thereby leading to largely changed film formation kinetics with earlier phase separation and longer film formation times, which enlarged fiber sizes in blend films and improved carrier generation and transport. As a result, D18‐N‐p with moderate aggregation ability delivered a high PCE of 18.82% by pairing with L8‐BO, which was further improved to 19.45% via interface engineering. Despite the slightly inferior small area device performances, D18‐N‐m showed improved solubility, which inspired us to adjust the ratio of meta‐trifluoromethyl pyridine carefully and obtain a polymer donor D18‐N‐m‐10 with good solubility in non‐halogenated solvent o‐xylene. High PCEs of 13.07% and 12.43% in 1 cm2 device and 43 cm2 module fabricated with slot‐die coating method were achieved based on D18‐N‐m‐10: L8‐BO blends. Our work emphasizes film formation kinetics optimization in device fabrication via aggregation ability modulation of polymer donors for efficient devices.This article is protected by copyright. All rights reserved

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Interface property–functionality interplay suppresses bimolecular recombination facilitating above 18% efficiency organic solar cells embracing simplistic fabrication

Abstract: Efficient exciton-to-charge generation from the introduction of non-fullerene acceptors (NFAs) has been an important breakthrough in organic solar cell (OSC) developments. However, low device fill factors (FFs) following significant free...

Cited by 20 publications

References 59 publications

Functionalized nickel oxide as a hole transport layer for organic solar cells with simultaneous enhancement of efficiency and stability

Functionalized nickel oxide as a hole transport layer for organic solar cells with simultaneous enhancement of efficiency and stability

Isomerization of Benzothiadiazole Yields a Promising Polymer Donor and Organic Solar Cells with Efficiency of 19.0%

Correlating Aggregation Ability of Polymer Donors with Film Formation Kinetics for Organic Solar Cells with Improved Efficiency and Processability

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