Reduced interface losses in inverted perovskite solar cells by using a simple dual-functional phenanthroline derivative

Zhao, Haiyan; Miao, Jingsheng; Li, Tingting; Liu, Ming; Murtaza, Imran; Meng, Hong

doi:10.1016/j.nanoen.2017.11.014

Cited by 44 publications

(45 citation statements)

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“…In addition to its function similar to CTAB as the n‐dopant of PCBM, Phen‐I can also be used as an interfacial layer between Ag electrode and PCBM. The presence of Phen‐I between PCBM and silver electrode decreased the energy barrier between these two materials, which was confirmed by Kelvin probe force microscopy measurement (KPFM) . The work function of Ag/Phen‐I was 0.18 eV lower than that of bare Ag electrode, which boosted the electron transport, leading to an enhanced PCE (from 10.7% to 18.1%) .…”

Section: Fullerene and Fullerene Derivatives (C60 C70 And Pcbm) As mentioning

confidence: 67%

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: Fullerene and Fullerene Derivatives (C60 C70 And Pcbm) As mentioning

confidence: 67%

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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“…Electrical conductivity of C 60 -SB interlayer was not affected by the thickness of film after doping, making an easy fabrication process. [178] These values were significantly higher than control device parameters (PCE of 10.7%, with a V OC of 1.10 V, a J SC of 18.15 mA cm −2 , and an FF of 53.56%). [152] In another attempt to mitigate the interfacial losses, an economical phenanthroline-based zwitterion (Phen-I) (Scheme 4) was synthesized via quaternization reaction by Meng's group.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 62%

“…[240][241][242][243][244] Second, interfacial materials can enhance the electrode selectivity and charge transportation in the devices. [175][176][177][178][179][180] In fact, the photovoltaic parameters (V OC , J SC , and FF) depend on the quantity of builtin electric field, which is governed by the WF difference of anode-cathode electrodes. [246][247][248] Lastly, interfacial materials also have a significant impact on the morphology and hence the stability of the electronic devices.…”

Section: Discussionmentioning

confidence: 99%

“…[152] Doping not only increased the electrical conductivity but also enabled the fabrication process simple and efficient. [178] The inverted PVSC device constructed with the configuration of ITO/NiO x /Perovskite layer/PC 61 BM/Phen-I/Ag by inserting Phen-I ZEI realized a high PCE of 18.13%. This advance in device efficiency was attributed to the interaction between C 60 -SB and TBAI.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

“…This advance in device efficiency was attributed to the interaction between C 60 -SB and TBAI. [178] The excitons in perovskite materials possess long diffusion length and a low binding energy, which lead to high efficiency of the inverted PSC devices with planar p-i-n structure. [178] The inverted PVSC device constructed with the configuration of ITO/NiO x /Perovskite layer/PC 61 BM/Phen-I/Ag by inserting Phen-I ZEI realized a high PCE of 18.13%.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

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Zwitterions for Organic/Perovskite Solar Cells, Light‐Emitting Devices, and Lithium Ion Batteries: Recent Progress and Perspectives

Islam

Pervaiz

et al. 2019

Advanced Energy Materials

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are covalently bonded and their unique characteristics enable them to demonstrate special performance in applications and distinguish them from other conventional organic salts. [12][13][14] Recently, a significant attention has been paid to the use of zwitterions owing to their solubility in polar solvents for solution processing, [15][16][17] and dipole formation for the transfer of carriers [18][19][20] and ions. [21][22][23] Zwitterions have emerged as alternatives to the widely used building blocks such as conventional ionic groups, for developing new functional materials. The presence of both negative and positive ions in the same molecule enables zwitterions to develop interfacial dipole. The ability of zwitterions to develop interfacial dipole provides a new pathway to utilize them as interfacial layer in optoelectronic devices, including organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light-emitting devices (OLEDs), as well as electrolyte additives for energy devices such as lithium ion batteries (LIBs).It is well known that the ability to transport the charge carriers between the electrodes and organic layers is very crucial to obtain highly efficient electronic devices. [24] A mismatch between the energy levels of organic layers and inorganic electrodes leads to the generation of an energy barrier that hampers the extraction or injection of charge carriers. [25] To get rid of this obstacle, an interlayer between the electrodes and organic layers is applied to facilitate the transfer of charges in organic devices. In OLEDs, interlayers are used to enhance charge injection and reduce the height of Schottky barrier. While in the case of OSCs and PVSCs, apart from the enhancement in charge injection, they also play an important role to increase the built-in electric field across the active layer, ensuring efficient extraction of photogenerated charge carriers. [26][27][28][29][30] Therefore, the design and development of effective interlayer materials for interfacial modification are crucial for high-performance electronic devices. Recently, some significant advances have been demonstrated by applying an interfacial layer between the electrodes and organic layers, resulting in power conversion efficiencies (PCEs) to exceed 14% for single-junction OSCs by choosing appropriate photoactive layer. [31,32] Among different interlayer materials used so far, zwitterionic materials have been proved Zwitterions, a class of materials that contain covalently bonded cations and anions, have been extensively studied in the past decades owing to their special features, such as excellent solubility in polar solvents, for solution processing and dipole formation for the transfer of carriers and ions. Recently, zwitterions have been developed as electrode modifiers for organic solar cells (OSCs), perovskite solar cells (PVSCs), and organic light-emitting devices (OLEDs), as well as electrolyte additives for lithium ion batteries (LIBs).With the rapid advances of zwitterionic materials, high-performan...

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Gaining Insight into the Effect of Organic Interface Layer on Suppressing Ion Migration Induced Interfacial Degradation in Perovskite Solar Cells

Ning

Zhu

Zhao

et al. 2020

Adv Funct Materials

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Ion migration induced interfacial degradation is a detrimental factor for the stability of perovskite solar cells (PSCs) and hence requires special attention to address this issue for the development of efficient PSCs with improved stability. Here, an “S‐shaped, hook‐like” organic small molecule, naphthalene diimide derivative (NDI‐BN), is employed as a cathode interface layer (CIL) to tailor the [6,6]‐phenylC61‐butyric acid methylester (PCBM)/Ag interface in inverted PSCs. By realizing enhanced electron extraction capability via the incorporation of NDI‐BN, a peak power conversion efficiency of 21.32% is achieved. Capacitance–voltage measurements and X‐ray photoelectron spectroscopy analysis confirmed an obvious role of this new organic CIL in successfully blocking ionic diffusion pathways toward the Ag cathode, thereby preventing interfacial degradation and improving device stability. The molecular packing motif of NDI‐BN further unveils its densely packed structure with π–π stacking force which has the ability to effectually hinder ion migration. Furthermore, theoretical calculations reveal that intercalation of decomposed perovskite species into the NDI clusters is considerably more difficult compared with the PCBM counterparts. This substantial contrast between NDI‐BN and PCBM molecules in terms of their structures and packing fashion determines the different tendencies of ion migration and unveils the superior potential of NDI‐BN in curtailing interfacial degradation.

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Reduced interface losses in inverted perovskite solar cells by using a simple dual-functional phenanthroline derivative

Cited by 44 publications

References 45 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

Zwitterions for Organic/Perovskite Solar Cells, Light‐Emitting Devices, and Lithium Ion Batteries: Recent Progress and Perspectives

Gaining Insight into the Effect of Organic Interface Layer on Suppressing Ion Migration Induced Interfacial Degradation in Perovskite Solar Cells

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