Efficiency improved for inverted polymer solar cells with electrostatically self-assembled BenMeIm-Cl ionic liquid layer as cathode interface layer

Fu, Ping; Huang, Linquan; Yu, Wei; Yang, Dong; Liu, Guiji; Zhou, Lei; Zhang, Jian; Li, Can

doi:10.1016/j.nanoen.2015.02.032

Cited by 74 publications

(54 citation statements)

References 33 publications

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“…The self‐organization method not only simplifies the fabrication procedure significantly but also makes the tolerance of the interlayer to thickness variation no need consideration. And hence, intensive investigations have been focused on the self‐organization method in fullerene‐based OSCs …”

Section: Device Characteristics Using Pvp As Cil With Different Procementioning

confidence: 99%

A Self‐Organized Poly(vinylpyrrolidone)‐Based Cathode Interlayer in Inverted Fullerene‐Free Organic Solar Cells

Yang

Zhang

et al. 2018

Advanced Materials

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surface of the film, forming the interlayer and active layer simultaneously. In order to better distinguish, the two approaches are recognized as the step-by-step preparation method and the self-organization method, respectively, in this work. The self-organization method not only simplifies the fabrication procedure significantly but also makes the tolerance of the interlayer to thickness variation no need consideration. And hence, intensive investigations have been focused on the self-organization method in fullerene-based OSCs. [4][5][6][7][8][9][10][11][12] The self-organization method is based on the self-assembly of the interlayer material during the film deposition process, and many factors have been suggested to explain the origin of the migration of the interlayer materials. It has been demonstrated that when an interlayer material has higher surface energy and stronger interaction with the indium tin oxide (ITO) electrode, it may tend to migrate to the near ITO side, and vice versa. [12][13][14][15][16] For instance, Wei et al. introduced fluorocarbon chains to [6,6]-phenyl-C61-butyric acid methyl ester (PC 61 BM) to decrease the surface energy of PC 61 BM, and as a result, the fluorinated PC 61 BM segregated to the top of the AL, forming the CIL and AL simultaneously. [15] By contrast, when PC 61 BM was substituted with high-surfaceenergy moieties, such as amino groups, the modified PC 61 BM could migrate to the interface between the AL and the ITO substrate. [5] Interestingly, poly(ethylene glycol) (PEG) and its derivatives, materials with high surface energies, have been demonstrated to prefer to self-organize at the top of the AL because of the strong interaction between the PEG segment and the top metal electrode. [12,[16][17][18][19][20] Poly(vinylpyrrolidone) (PVP), poly(2-vinylpyridine) (P2VP), poly [(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN), polyethyleneimine (PEI), oleamide, and fluorinated zinc oxide have also been used to self-organize CILs in OSCs. [9,13,[21][22][23][24] All the aforementioned materials were applied in fullerene-based OSCs via the self-organization method, and the reported utilization of PVP through self-organization method is associated with a conventional device architecture, [21] which makes its application in the inverted devices seem impossible. Meanwhile, for fullerene-free OSCs, that have more potential for realizing higher photovoltaic performances and in future practical applications, no example has been developed to date.In this work, we demonstrate the first example that uses PVP as the CIL in the inverted OSCs via the self-organization method.Herein, poly(vinylpyrrolidone) (PVP) is used as the cathode interlayer (CIL) through the self-organization method in inverted organic solar cells (OSCs). By coating a solution of PVP and active layer materials onto a glass/indium tin oxide (ITO) substrate, the PVP can segregate to the near ITO side due to its high surface energy and strong intermolecular interaction with the I...

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Section: Device Characteristics Using Pvp As Cil With Different Procementioning

confidence: 99%

A Self‐Organized Poly(vinylpyrrolidone)‐Based Cathode Interlayer in Inverted Fullerene‐Free Organic Solar Cells

Yang

Zhang

et al. 2018

Advanced Materials

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“…One of the prototypical organic ETL materials for OSCs is the small molecule bathocuproine (BCP) . Building on the BCP success, a number of other small molecules, such as bathophenanthroline (Bphen), zwitterions, pyridine derivatives, and a variety of self‐assembled ionic liquids, have been reported and shown to improve electron extraction in OSCs by providing suitable energy‐level matching with the active layer. Among them, 3‐[6‐(diphenylphosphinyl)‐2‐naphthalenyl]‐1,10‐Phenanthroline (Phen‐NaDPO) was shown to combine high electron mobility with good solubility in common solvents that are orthogonal to the organic active layer, enabling the development of OSCs with PCE of over 8.5% …”

Section: Introductionmentioning

confidence: 99%

Use of the Phen‐NaDPO:Sn(SCN)₂ Blend as Electron Transport Layer Results to Consistent Efficiency Improvements in Organic and Hybrid Perovskite Solar Cells

Seitkhan

Neophytou

Kirkus

et al. 2019

Adv Funct Materials

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A simple approach that enables a consistent enhancement of the electron extracting properties of the widely used small-molecule Phen-NaDPO and its application in organic solar cells (OSCs) is reported. It is shown that addition of minute amounts of the inorganic molecule Sn(SCN) 2 into Phen-NaDPO improves both the electron transport and its film-forming properties. Use of Phen-NaDPO:Sn(SCN) 2 blend as the electron transport layer (ETL) in binary PM6:IT-4F OSCs leads to a remarkable increase in the cells' power conversion efficiency (PCE) from 12.6% (Phen-NaDPO) to 13.5% (Phen-NaDPO:Sn(SCN) 2 ). Combining the hybrid ETL with the best-in-class organic ternary PM6:Y6:PC 70 BM systems results to a similarly remarkable PCE increase from 14.2% (Phen-NaDPO) to 15.6% (Phen-NaDPO:Sn(SCN) 2 ). The consistent PCE enhancement is attributed to reduced trap-assisted carrier recombination at the bulk-heterojunction/ETL interface due to the presence of new energy states formed upon chemical interaction of Phen-NaDPO with Sn(SCN) 2 . The versatility of this hybrid ETL is further demonstrated with its application in perovskite solar cells for which an increase in the PCE from 16.6% to 18.2% is also demonstrated.

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“…Organic solar cells (OSCs) have attracted more and more attention since their low cost, low weight, semitransparent [1][2][3][4][5][6][7][8][9][10][11]. The anode interface layer (AIL) serves as a selective contact by extracting holes while concurrently blocking electrons is widely used in all OSCs devices to reduce the leakage current and enhance the open circuit voltage [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…The sol-gel-derived MoO x film (S-MoO x ) show high density and has well wettability which are benefit to organic active layer deposition. The OSCs devices with S-MoO x layer based on poly [ [4,8- [3,4-b] thiophenediyl]]: [6,6]-phenyl-C 71 -butyric acid methyl ester (PTB7:PC 71 BM) bulk heterojunction shows comparable performance with that of with commercial PEDOT:PSS layer. It is worth to notice that this S-MoO x is non-sensitive to thermal treatment temperature, which it can keep better electronic property under thermal treatment temperature changing from annealing-free to 250°C.…”

Section: Introductionmentioning

confidence: 99%

A wide temperature tolerance, solution-processed MoOx interface layer for efficient and stable organic solar cells

Cai

Zhang

et al. 2017

Solar Energy Materials and Solar Cells

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Efficiency improved for inverted polymer solar cells with electrostatically self-assembled BenMeIm-Cl ionic liquid layer as cathode interface layer

Cited by 74 publications

References 33 publications

A Self‐Organized Poly(vinylpyrrolidone)‐Based Cathode Interlayer in Inverted Fullerene‐Free Organic Solar Cells

A Self‐Organized Poly(vinylpyrrolidone)‐Based Cathode Interlayer in Inverted Fullerene‐Free Organic Solar Cells

Use of the Phen‐NaDPO:Sn(SCN)₂ Blend as Electron Transport Layer Results to Consistent Efficiency Improvements in Organic and Hybrid Perovskite Solar Cells

A wide temperature tolerance, solution-processed MoOx interface layer for efficient and stable organic solar cells

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Efficiency improved for inverted polymer solar cells with electrostatically self-assembled BenMeIm-Cl ionic liquid layer as cathode interface layer

Cited by 74 publications

References 33 publications

A Self‐Organized Poly(vinylpyrrolidone)‐Based Cathode Interlayer in Inverted Fullerene‐Free Organic Solar Cells

A Self‐Organized Poly(vinylpyrrolidone)‐Based Cathode Interlayer in Inverted Fullerene‐Free Organic Solar Cells

Use of the Phen‐NaDPO:Sn(SCN)2 Blend as Electron Transport Layer Results to Consistent Efficiency Improvements in Organic and Hybrid Perovskite Solar Cells

A wide temperature tolerance, solution-processed MoOx interface layer for efficient and stable organic solar cells

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Use of the Phen‐NaDPO:Sn(SCN)₂ Blend as Electron Transport Layer Results to Consistent Efficiency Improvements in Organic and Hybrid Perovskite Solar Cells