Non‐Fullerene Organic Electron‐Transporting Materials for Perovskite Solar Cells

Jung, Su-Kyo; Lee, David S.; Ann, Myung Hyun; Im, Sang Hyuk; Kim, Jong H.; Kwon, O‐Pil

doi:10.1002/cssc.201801908

Cited by 30 publications

(17 citation statements)

References 39 publications

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“…ETLs, generally possessing electron rich centers such as sulfur and nitrogen, can act as Lewis base and the passivation of electron‐trap centers could be replaced by the coordination of N‐Pb and S‐Pb. Therefore, ETLs with optimized passivation groups should get rid of nonradiative recombination and mitigate hysteresis . As shown in Figure , some trials have been demonstrated to passivate these defects through the introduction of thiophene and pyridine groups .…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Organic Electron Transport Materials in Inverted Perovskite Solar Cells

Said

Xie

Zhang

2019

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Organic n‐type materials (e.g., fullerene derivatives, naphthalene diimides (NDIs), perylene diimides (PDIs), azaacene‐based molecules, and n‐type conjugated polymers) are demonstrated as promising electron transport layers (ETLs) in inverted perovskite solar cells (p–i–n PSCs), because these materials have several advantages such as easy synthesis and purification, tunable frontier molecular orbitals, decent electron mobility, low cost, good solubility in different organic solvents, and reasonable chemical/thermal stability. Considering these positive factors, approaches toward achieving effective p–i–n PSCs with these organic materials as ETLs are highlighted in this Review. Moreover, organic structures, electron transport properties, working function of electrodes caused by ETLs, and key relevant parameters (PCE and stability) of p–i–n PSCs are presented. Hopefully, this Review will provide fundamental guidance for future development of new organic n‐type materials as ETLs for more efficient p–i–n PSCs.

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Section: Introductionmentioning

confidence: 99%

Recent Progress in Organic Electron Transport Materials in Inverted Perovskite Solar Cells

Said

Xie

Zhang

2019

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172

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“…There has been vast research focusing on exploring novel HTL materials. − As the counterpart, the progress on ETL materials is slower. To ensure that n-type materials have better performance in PSCs, they should have good solubility, high electron mobility, and suitable energy levels aligned with perovskite materials . Currently, most of the present electron-transport materials are based on n-type organic semiconductors, especially those with large planar π-conjugated structures.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, non-fullerene acceptors in organic solar cells (OSCs) constructed from indacenodithiophene (IDT), indacenodithieno[3,2- b ]thiophene (IDTT), and their analogues have attracted wide attention due to their tunable energy levels and good charge transport, resulting from the rigid multifused ring. With these intrinsic advantages, they were also utilized as ETL materials for PSCs, and excellent PCE results up to 19% were obtained, which encouraged researchers to discover more novel efficient ETL materials. ,− …”

Section: Introductionmentioning

confidence: 99%

Sulfur Position in Pyrene-Based PTTIs Plays a Key Role To Determine the Performance of Perovskite Solar Cells When PTTIs Were Employed as Electron Transport Layers

Chen

Said

Wang

et al. 2019

ACS Appl. Energy Mater.

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In this study, two novel small organic molecules (PTTI-1 and PTTI-2, the difference between them is the position of sulfur atom in thieno [3,4-b]thiophene(TT)) are designed and synthesized through introduction of the pyrene unit as the central building block and TT as the conjugated linking units. The as-prepared compounds have been demonstrated as electron transport layers (ETLs) for perovskite solar cells (PSCs), and PTTI-1 shows a better power conversation efficiency (PCE) value of 15.37%, higher than that of PTTI-2 (11.07%), which may be due to the suitable energy level, strong passivation behavior, and higher electron mobility of PTTI-1. Our study clearly indicates that the sulfur position in this type of electron-transport materials plays an important role in influencing the performance of PSCs. More importantly, our devices show decent stability, where PTTI-1-based devices retain about 83% of its initial stability after 10 days of testing.

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“…In inverted p-i-n architecture, fullerene and corresponding derivatives have been used as the most common ETL materials. However, the temporal stability of fullerene and corresponding derivatives is also poor, which can be evident from the morphological changes upon recrystallization [214]. Therefore, the research about ETL is still in a beginning stage, especially for the non-fullerene ETL.…”

Section: Polymers In Perovskite Solar Cellsmentioning

confidence: 99%

The Applications of Polymers in Solar Cells: A Review

et al. 2019

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The emerging dye-sensitized solar cells, perovskite solar cells, and organic solar cells have been regarded as promising photovoltaic technologies. The device structures and components of these solar cells are imperative to the device’s efficiency and stability. Polymers can be used to adjust the device components and structures of these solar cells purposefully, due to their diversified properties. In dye-sensitized solar cells, polymers can be used as flexible substrates, pore- and film-forming agents of photoanode films, platinum-free counter electrodes, and the frameworks of quasi-solid-state electrolytes. In perovskite solar cells, polymers can be used as the additives to adjust the nucleation and crystallization processes in perovskite films. The polymers can also be used as hole transfer materials, electron transfer materials, and interface layer to enhance the carrier separation efficiency and reduce the recombination. In organic solar cells, polymers are often used as donor layers, buffer layers, and other polymer-based micro/nanostructures in binary or ternary devices to influence device performances. The current achievements about the applications of polymers in solar cells are reviewed and analyzed. In addition, the benefits of polymers for solar cells, the challenges for practical application, and possible solutions are also assessed.

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Non‐Fullerene Organic Electron‐Transporting Materials for Perovskite Solar Cells

Cited by 30 publications

References 39 publications

Recent Progress in Organic Electron Transport Materials in Inverted Perovskite Solar Cells

Recent Progress in Organic Electron Transport Materials in Inverted Perovskite Solar Cells

Sulfur Position in Pyrene-Based PTTIs Plays a Key Role To Determine the Performance of Perovskite Solar Cells When PTTIs Were Employed as Electron Transport Layers

The Applications of Polymers in Solar Cells: A Review

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