Organic Solar Cells Based on High Hole Mobility Conjugated Polymer and Nonfullerene Acceptor with Comparable Bandgaps and Suitable Energy Level Offsets Showing Significant Suppression of Jsc–Voc Trade‐Off

Wang, Zhen; Liu, Xuncheng; Jiang, Haiying; Zhou, Xiaobo; Zhang, Lianjie; Pan, Feilong; Qiao, Xianfeng; Ma, Dongge; Ma, Wei; Ding, Liming; Cao, Yong; Chen, Junwu

doi:10.1002/solr.201900079

Cited by 30 publications

(19 citation statements)

References 112 publications

(129 reference statements)

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“…This can be explained by the enlarged conjugation and profitable interfacial modification, and a higher mobility which is one of main causes of a higher J sc . [44,45] Taking the hole mobility into account, the balance between μ e /μ h of HBC-S has been 0.96 while the HBC-H obtained 0.62, which possibly well supported the such a high FF of the HBC-Sbased devices. In addition, the ability of exciton dissociation also reflects the quality of the interfaces.…”

Section: Improvement Of J Sc and Ff Related To Carrier Transportmentioning

confidence: 61%

Nanographene–Osmapentalyne Complexes as a Cathode Interlayer in Organic Solar Cells Enhance Efficiency over 18%

et al. 2021

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Development of power conversion efficiency (PCE) and short-term stability are still huge challenges that restrict the actual industrialization of OSCs. [5,6] There has been much exploration of the state-of-art photovoltaic performance, with methods that mainly concentrate on the molecular design, structure modification of devices, and the construction of active layers. [7][8][9] Through innovative molecular design and matching with suitable donors, the Y6 system has opened a new vista in which the efficiency of nonfullerene solar cells (NFSC) approached 16%. [10] To date, subsequent optimizations have brought a brighter future with the PCE in single-junction devices exceeding 18%. [11][12][13][14] Together with molecular innovation, interface engineering also improves the device performances continually. Gene rally, interface engineering implies that through insertion of a single or double interlayer between an active layer and a cathode or anode to improve the indirect contact between them, and further regulation of the morphology or work function of electrodes, the devices can be improved. Included amongst the most popular interfacial materials, there are several main types: [15] metal oxides (MO), including the commonly used ZnO [16] and MoOx, alcohol-soluble polymers and small molecules such as amino PDINO [17] and PFN-Br, [18] Interface engineering is a critical method by which to efficiently enhance the photovoltaic performance of nonfullerene solar cells (NFSC). Herein, a series of metal-nanographene-containing large transition metal involving d π -p π conjugated systems by way of the addition reactions of osmapentalynes and p-diethynyl-hexabenzocoronenes is reported. Conjugated extensions are engineered to optimize the π-conjugation of these metal-nanographene molecules, which serve as alcohol-soluble cathode interlayer (CIL) materials. Upon extension of the π-conjugation, the power conversion efficiency (PCE) of PM6:BTP-eC9-based NFSCs increases from 16% to over 18%, giving the highest recorded PCE. It is deduced by X-ray crystallographic analysis, interfacial contact methods, morphology characterization, and carrier dynamics that modification of hexabenzocoronenes-styryl can effectively improve the short-circuit current density (J sc ) and fill factor of organic solar cells (OSCs), mainly due to the strong and ordered charge transfer, more matching energy level alignments, better interfacial contacts between the active layer and the electrodes, and regulated morphology. Consequently, the carrier transport is largely facilitated, and the carrier recombination is simultaneously impeded. These new CIL materials are broadly able to enhance the photovoltaic properties of OSCs in other systems, which provides a promising potential to serve as CILs for higher-quality OSCs.

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Section: Improvement Of J Sc and Ff Related To Carrier Transportmentioning

confidence: 61%

Nanographene–Osmapentalyne Complexes as a Cathode Interlayer in Organic Solar Cells Enhance Efficiency over 18%

et al. 2021

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“…These devices are the result of careful and delicate optimization of the active layer morphology. From this point of view, IDTBR (a2) is again one of the more robust acceptors, with PCE as high as 8.1% for 1010 nm thick devices [78]. IDIC-type acceptors provide devices with 8.5% PCE at a 530 nm thickness (for comparison, the PCE at 105 nm is 12.2%) [79], while in the case of the ITIC-type acceptor, a device with 8.9% at 500 nm has been reported (12.7% at 141 nm) [80].…”

Section: Industrial Considerations and Scalability Of Nfasmentioning

confidence: 97%

Recent Advances in Non-Fullerene Acceptors of the IDIC/ITIC Families for Bulk-Heterojunction Organic Solar Cells

Forti

Nitti

Osw

et al. 2020

IJMS

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The introduction of the IDIC/ITIC families of non-fullerene acceptors has boosted the photovoltaic performances of bulk-heterojunction organic solar cells. The fine tuning of the photophysical, morphological and processability properties with the aim of reaching higher and higher photocurrent efficiencies has prompted uninterrupted worldwide research on these peculiar families of organic compounds. The main strategies for the modification of IDIC/ITIC compounds, described in several contributions published in the past few years, can be summarized and classified into core modification strategies and end-capping group modification strategies. In this review, we analyze the more recent advances in this field (last two years), and we focus our attention on the molecular design proposed to increase photovoltaic performance with the aim of rationalizing the general properties of these families of non-fullerene acceptors.

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“…Moreover, by introducing a siloxane‐terminated side chain, the copolymer PFBT4T‐C5Si‐25% obtained PCEs of 10.95% at a film thickness of 380 nm and 11.09% at 420 nm in fullerene systems, and a PCE of 11.5% at 400‐nm thickness was also achieved when blended with O‐IDTBR. The introduction of siloxane chain enhanced the face‐on orientation and resulted in favorable three‐dimensional hole transport in thick junctions, such that the FF becomes stabilized at 74% as the J SC slightly increases with greater film thickness 56,57 . Further investigation revealed that with a higher molecular weight, PFBT4T‐C5Si‐25%:IEICO‐4F devices showed an improved absorption, uniform morphology, and enhanced charge mobility, which resulted in a J SC improving from 19.7 to 26.8 mA cm − 2 at an optimal thickness of 320 nm (Figure 5C).…”

Section: Molecular Design Strategies For Thickness‐insensitive Materialsmentioning

confidence: 99%

“…The introduction of siloxane chain enhanced the face-on orientation and resulted in favorable three-dimensional hole transport in thick junctions, such that the FF becomes stabilized at 74% as the J SC slightly increases with greater film thickness. 56,57 Further investigation revealed that with a higher molecular weight, PFBT4T-C5Si-25%:IEICO-4F devices showed an improved absorption, uniform morphology, and enhanced charge mobility, which resulted in a J SC improv-ing from 19.7 to 26.8 mA cm −2 at an optimal thickness of 320 nm ( Figure 5C). 58 Based on the ffBT and NT systems, Yan et al studied the influence of temperature-dependent behavior on morphology control, and reported PCEs ranging from 9.5 to 10.5% at a film thickness of 300 nm.…”

Section: 6-difluorobenzothiadiazole-based Polymersmentioning

confidence: 99%

Recent progress in thick‐film organic photovoltaic devices: Materials, devices, and processing

Zhang

Fan

Ying

et al. 2021

SusMat

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A successful transfer of organic photovoltaic technologies from lab to fab has to overcome a range of critical challenges such as developing high-mobility light-harvesting materials, minimizing the upscaling losses, designing advanced solar modules, controlling film quality, decreasing overall cost, and extending long-operation lifetime. To realize large-area devices toward practical applications, much effort has been devoted to understanding the fundamental mechanism of how molecular structures, device architectures, interfacial engineering, and light management and carrier dynamics affect photovoltaic performance. Such studies addressed various fundamental issues of charge carrier behavior in organic heterojunctions primarily in terms of exciton generation dependence upon light incidence, charge transportation dependence on built-in electric field, and charge extraction versus recombination. In consideration of high-throughput roll-to-roll process for large-scale fabrication of organic photovoltaic devices, it is highly appreciable to realize high power conversion efficiencies that are highly tolerable to the film thickness. Herein we summarize the recent progress in developing thick-film organic photovoltaic devices from the perspective of efficiency-loss mechanisms, material design, and device optimization strategies, proposing guidelines for designing high-efficiency thickness-insensitive devices toward mass production.

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Organic Solar Cells Based on High Hole Mobility Conjugated Polymer and Nonfullerene Acceptor with Comparable Bandgaps and Suitable Energy Level Offsets Showing Significant Suppression of J_sc–V_oc Trade‐Off

Cited by 30 publications

References 112 publications

Nanographene–Osmapentalyne Complexes as a Cathode Interlayer in Organic Solar Cells Enhance Efficiency over 18%

Nanographene–Osmapentalyne Complexes as a Cathode Interlayer in Organic Solar Cells Enhance Efficiency over 18%

Recent Advances in Non-Fullerene Acceptors of the IDIC/ITIC Families for Bulk-Heterojunction Organic Solar Cells

Recent progress in thick‐film organic photovoltaic devices: Materials, devices, and processing

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