An alcohol-dispersed conducting polymer complex for fully printable organic solar cells with improved stability

Jiang, Youyu; Dong, Xinyun; Sun, Lulu; Liu, Tiefeng; Qin, Fei; Xie, Cong; Jiang, Pei; Hu, Lu; Lü, Xin; Zhou, Xianmin; Meng, Wei; Li, Ning; Brabec, Christoph J.; Zhou, Yinhua

doi:10.1038/s41560-022-00997-9

Cited by 179 publications

(183 citation statements)

References 46 publications

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“…[ 136,137 ] However, the hidden reasons for this are unclear, thus requiring more researches to unveil. (4)With the emergence of highly efficient binary systems, typically like Y‐series molecules, the extent of efficiency improvement is limited for ternary OPVs. New findings should be explored that show positive effects on optimizing the device performance of ternary OPVs. (5)Besides efficiency, other factors like thick‐film, [ 138,139 ] large area, [ 140–142 ] etc., are also critical for the industrial applications of OPVs. It is also essential to study how ternary strategy works in efficient OPVs with thick‐film or large area.…”

Section: Outlooksmentioning

confidence: 99%

Achieving and Understanding of Highly Efficient Ternary Organic Photovoltaics: From Morphology and Energy Loss to Working Mechanism

Zhan

et al. 2022

Small Methods

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design and device configuration innovation, the power conversion efficiencies (PCEs) of OPVs have been boosted rapidly in the recent few years. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Currently, the most advanced OPVs are based on Y-series non-fullerene acceptors (NFAs), for which a series of molecular structure optimizations, including alkyl chain tuning, [24,25] asymmetric terminals, [12,[26][27][28] and heteroatom exchanging, [29,30] are explored, and various ternary or tandem devices are also developed to advance the PCEs to exceed 19% for single-junction devices and 20% for tandem devices, [31][32][33][34][35][36] thus speeding up the progress for the industrialization of OPVs. [37] For OPV devices, the whole working process for photon-to-electron conversion includes five steps: 1) exciton generation after light absorption; 2) exciton diffusion to donor/acceptor (D/A) interfaces; 3) exciton dissociation into free charges; 4) free charge transport to buffer layers; 5) charge collection by the electrodes. [38] Among them, the intermediate three steps, which all face the big issue of charge recombination, mainly govern the achievement of high efficiencies. [39][40][41] Generally, exciton diffusion is correlated with domain sizes and exciton lifetimes, exciton dissociation is related with interface abundance and driving force, while charge transport is affected by molecular orientation and charge mobility. [42][43][44] And all above mentioned factors point to the same key topic: morphology control, [45] which can be modulated by tuning the photovoltaic material properties, for example, temperature-dependent aggregation for polymer donors, [46,47] dominant face-on orientation of small molecule acceptors, [48,49] or applying post-treatments including thermal annealing, solvent additive, etc. [50][51][52][53] Besides, utilizing ternary blend by introducing a third component is another effective and convenient way to achieve morphology control for higher efficiencies. [54][55][56] The well-refined active layer morphology may be equipped with some of the following features: bi-continuous interpenetrating network, modest domain sizes, defined vertical phase separation, fibril-like form, etc. [35,[57][58][59][60] In device parameters, through morphology control, short-circuit current density (J sc ) and fill factor (FF) can be managed significantly, while the open-circuit voltage (V oc ) is heavily dependent on the energy loss (E loss ). [61] Different from inorganic solar cells, the tightly Coulombic bounded Frenkel excitons in OPVs bring a critical problem that Ternary strategy, adding an additional donor (D) or acceptor (A) into conventional binary D:A blend, has shown great potential in improving photovoltaic performances of organic photovoltaics (OPVs) for practical applications. Herein, this review is presented on how efficient ternary OPVs are realized from the aspects of morphology, energy loss, and working mechanism. As to morphology, the role of third component on the formation of...

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Section: Outlooksmentioning

confidence: 99%

Achieving and Understanding of Highly Efficient Ternary Organic Photovoltaics: From Morphology and Energy Loss to Working Mechanism

Zhan

et al. 2022

Small Methods

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“…Surprisingly, the OMP-doping can only slightly enhance the performance of hole transporting layer-free OSCs from 0.1% to 2.1% (Figure S12, Supporting Information) based on the active layer of PBDB-T-2F:Y6:PC 71 BM, and from 0.6% to 4.6% based on the active layer of PBDB-T-2F:BTP-eC9:PC 71 BM (Figure S13, Supporting Information). Those efficiencies are still much lower than those references with MoO 3 [36] or PEDOT-based [37] hole transporting layer. The less effectiveness of OMP-doping method for the PBDB-T-2F:Y6:PC 71 BM and PBDB-T-2F:BTP-eC9:PC 71 BM are to be further investigated.…”

Section: Resultsmentioning

confidence: 58%

Producing p‐Doped Surface for Hole Transporting Layer‐Free Nonfullerene Organic Solar Cells

Liu

Wang

Dong

et al. 2022

Macromol. Rapid Commun.

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Hole transporting layer‐free organic solar cells with simplified device structures are desirable for their mass production. In this work, a p‐dopant of organic molybdenum peroxide (OMP) to dope nonfullerene active layers to produce p‐doped surface on the active layer is adopted. The OMP can effectively dope widely used polymer donors of nonfullerene organic solar cells, i.e., PTB7‐Th, PBDB‐T, and even PBDB‐T‐2F that has a very deep highest occupied molecular orbital (HOMO) energy level of −5.47 eV. The doping mechanism lies in the strong oxidizing property of peroxide groups of the OMP leading to superior doping properties. In the end, hole transporting layer‐free nonfullerene organic solar cells with the device structure of ITO/PEI‐Zn/PBDB‐T‐2F:IT‐4F/Ag are fabricated. The cells show a power conversion efficiency of 12.2% and good thermal stability.

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“…63 Zhou's group further reported that PEI-Zn can accommodate exible OSC fabrication owing to the low annealing temperature of 150 C. 64 This kind of CIL can be processed on both conductive PEDOT:PSS and silver nanowire based electrodes, giving PCEs of 12.3% and 15.0% for PBDB-T-2F:Y6, respectively. Very recently, Zhou et al further applied a PEI-Zn CIL in the fabrication of all-printed OSCs, 65 combined with alcohol processable PEDOT:F as the HTL. Besides the above organic dopants, simple coordination complexes, especially those based on 8-hydroxyquinoline, can also be used in ZnO lm fabrication.…”

Section: Sol-gel Derived Hybrid Cilsmentioning

confidence: 99%

Organic–inorganic hybrid cathode interlayer materials for efficient organic solar cells

Zhang

Fang

et al. 2022

Sustainable Energy Fuels

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An alcohol-dispersed conducting polymer complex for fully printable organic solar cells with improved stability

Cited by 179 publications

References 46 publications

Achieving and Understanding of Highly Efficient Ternary Organic Photovoltaics: From Morphology and Energy Loss to Working Mechanism

Achieving and Understanding of Highly Efficient Ternary Organic Photovoltaics: From Morphology and Energy Loss to Working Mechanism

Producing p‐Doped Surface for Hole Transporting Layer‐Free Nonfullerene Organic Solar Cells

Organic–inorganic hybrid cathode interlayer materials for efficient organic solar cells

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