The benefits of ionic liquids for the fabrication of efficient and stable perovskite photovoltaics

Shahiduzzaman, Md.; Muslih, Ersan Y.; Arslanoğlu, Hasan; Wang, LiangLe; Fukaya, Shoko; Nakano, Masahiro; Karakawa, Makoto; Takahashi, Kohshin; Akhtaruzzaman, Md.; Nunzi, Jean‐Michel; Taima, Tetsuya

doi:10.1016/j.cej.2021.128461

Cited by 93 publications

(43 citation statements)

References 125 publications

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“…As compared with the flat PSC, the textured solar cell exhibits higher QEs throughout the complete spectrum; however, a slight reduction of the QE in the UV region (<350 nm) in the case of textured solar cells is observed, which could also positively impact the device stability as UV absorption greatly affects the degradation of the perovskite absorber. [4,25,47] In contrast, the NIR absorption greatly depends on the perovskite thickness, where a higher absorption is found in the case of 450 nm perovskite. A peak of the QE has been found at 500 nm, which almost approaches unity.…”

Section: Psc Embedded With Nanophotonic Structuresmentioning

confidence: 99%

“…Perovskite solar cells (PSCs) are considered as an alternative to the present silicon (Si) photovoltaic (PV) technology because they can materialize the most attractive advantages of third-generation thin-film photovoltaics. [1][2][3][4][5][6][7][8] Both the academic and industrial communities are intrigued by the PSCs due to their unique combination of desirable properties and ease of fabrication as they offer high absorption, tunable bandgap, low deposition temperature, and long carrier diffusion length, while using an inexpensive and scalable solution process to fabricate PSCs. [9][10][11][12][13] At a basic level, the large carrier diffusion lengths >1 μm combined with the short penetration depth of light (≤0.4 μm) results in thin-film solar cells with high power conversion efficiency (PCE).…”

Section: Introductionmentioning

confidence: 99%

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Improved Nanophotonic Front Contact Design for High‐Performance Perovskite Single‐Junction and Perovskite/Perovskite Tandem Solar Cells

et al. 2021

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The front contact of solar cells greatly influences the optoelectronic performance of perovskite solar cells (PSCs) by controlling the coherent light propagation as well as charge transport within the device. Herein, the nanophotonic front contact consisting of multilayer nanodomes and nanoholes for high‐efficiency perovskite single‐junction and perovskite/perovskite tandem solar cells (PVK/PVK TSCs) is investigated. The optical and electrical characteristics of solar cells are investigated by conducting an advanced 3D numerical approach with the combination of finite‐difference time‐domain (FDTD) and finite‐element method (FEM) simulations embedded with the particle swarm optimization (PSO) algorithm. The numerical modeling is validated by fabricating a set of efficient PSCs, optimized to a power conversion efficiency (PCE) of 17.9%, VOC of 1.07 V, JSC of 21.8 mA cm−2 and fill factor (FF) of 77%. The nanophotonic device results in improved JSC by 10−15%, resulting from 10−15% enhanced light incoupling compared with the planar device, while also strengthening the omnidirectional capabilities at angles of illumination as high as 40°. The optimized nanophotonic front contact results in PCEs of >23% and >30% (matched JSC ≈18 mA cm−2) for single‐junction PSCs and PVK/PVK TSCs, respectively. Details of the nanophotonic front contact, device, and fabrication process are provided.

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Section: Psc Embedded With Nanophotonic Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved Nanophotonic Front Contact Design for High‐Performance Perovskite Single‐Junction and Perovskite/Perovskite Tandem Solar Cells

et al. 2021

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“…48−50 Along with this, thermal and electrochemical stability and high ionic conductivity of ILs have shown a tremendous effect on the photovoltaic performance of the perovskite devices. 49,51 Moreover, recently, some ILs have been found to be suitable for surface passivation of perovskite materials. 51−53 These ILs have been incorporated in the perovskite precursor, and this has helped to improve the PCE by reducing the charge recombination.…”

Section: Introductionmentioning

confidence: 99%

“…29 Moreover, this set of ILs is also known to form a protective layer on PNCs. 51 Here, both steady-state and time-resolved fluorescence measurements of PNCs have been performed in the presence and absence of ILs. The molecular structures of the abovementioned ILs are shown in Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, an IL with desired properties can be designed for a particular application by employing proper cation–anion combinations . It has been found that the efficiency and stability of a perovskite solar cell device can be improved by tuning the crystallization kinetics of the perovskite-active layer and providing high hydrophobicity through IL treatment. − Along with this, thermal and electrochemical stability and high ionic conductivity of ILs have shown a tremendous effect on the photovoltaic performance of the perovskite devices. , Moreover, recently, some ILs have been found to be suitable for surface passivation of perovskite materials. − These ILs have been incorporated in the perovskite precursor, and this has helped to improve the PCE by reducing the charge recombination . This discussion has pointed out that even though ILs are found to be effective in PCE and solar conversion efficiency, such studies are very limited.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the Stability and Photoluminescence Quantum Yield of CsPbX₃ (X = Cl and Br) Perovskite Nanocrystals by Treatment with Imidazolium-Based Ionic Liquids through Surface Modification

et al. 2021

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Even though perovskite nanocrystals (PNCs) are quite attractive for optoelectronic applications, issues such as the low photoluminescence quantum yield (PLQY) and poor chemical stability of PNCs still remain formidable challenges that need to be tackled. Because ionic liquids (ILs) possess some interesting physicochemical properties, the present study is undertaken to find out the suitability of ILs in obtaining stable and defect-free PNCs. To explore this possibility, the interaction of ILs with PNCs has been investigated by both spectroscopy and microscopy. Studies have demonstrated that a significant enhancement in the PLQY of PNCs can be obtained by postsynthetic treatment of PNCs with chosen ILs. Analysis of time-resolved fluorescence studies, X-ray photoelectron spectroscopy, and infrared spectroscopy data has suggested that ILs help in removing excess lead from the surface of PNCs. Interestingly, it has also been observed that the chemical stability of PNCs can be increased considerably in the presence of ILs. More interestingly, the investigations have further shown that IL-treated PNCs are stable even at a single-particle level. The outcomes essentially show that ILs can effectively be used in obtaining chemically stable and photostable PNCs with improved photophysical properties.

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Recombination Pathways in Perovskite Solar Cells

Odunmbaku

Chen

Guo

et al. 2022

Adv Materials Inter

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PSCs thus seem capable of exceeding the power conversion efficiency (PCE) of monolithic silicon photovoltaics, currently with a champion PCE of 26.7%. [3] Furthermore, their wider bandgap relative to silicon makes them an ideal option for multijunction siliconperovskite tandem cells with PCEs of up to 29.8% already realized. [3] Theoretical efficiency predictions for multijunction silicon-perovskite tandem cells exceed 38% as they are not constrained by the thermodynamic limits of single-junction cells. [11] In order to reach the theoretically predicted PCEs in perovskite-based singleand multijunction cells, further advances in PSC research are required.Nonradiative recombination losses in PSCs, occurring within the bulk of the MHP absorber and at MHP/charge transport layer (CTL) interfaces, have been established to be the dominant factor that limits the attainment of higher PCE. Losses resulting from bulk and interfacial nonradiative recombination are known to limit the PSCs open-circuit voltage (V OC ) and the fill factor (FF), leading to suboptimal power conversion. [12,13] Although there has been a number of research, the dominant sources and pathways of nonradiative recombination in PSCs is still a topic of debate. For example, non-negligible defect densities in solution processed MHP thin films have been reported to vary between 10 14 and 10 18 cm −3 . [14][15][16] Thus, high PCE in perovskites have been claimed to be as a result of the high defect tolerance in MHPs. This is supported by advanced theoretical calculations [17,18] using density functional theory (DFT) with hybrid functionals and including spin-orbit coupling (SOC) effects, which predict that most point defect types in MHP films form shallow traps, with the exception of less abundant iodine defects, thereby explaining the defect tolerance of MHPs. By contrast, experimental studies including the observation of subunity internal photoluminescence quantum yields (PLQY) [19,20] strongly suggests that defects certainly seem to play an important role in the optoelectronic properties of MHPs and cannot be neglected. Furthermore, recent reports suggest that nonradiative recombination losses across the MHP/CTL interfaces are of more importance than nonradiative losses in the bulk of MHPs. [21][22][23][24][25][26][27] Current approaches for suppressing nonradiative recombination focuses on grain boundaries within the bulk of MHPs and MHP/CTL interfaces. This includes chemical additives for passivating traps within the perovskite bulk and at grain boundaries (GBs). [28,29]

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The benefits of ionic liquids for the fabrication of efficient and stable perovskite photovoltaics

Cited by 93 publications

References 125 publications

Improved Nanophotonic Front Contact Design for High‐Performance Perovskite Single‐Junction and Perovskite/Perovskite Tandem Solar Cells

Improved Nanophotonic Front Contact Design for High‐Performance Perovskite Single‐Junction and Perovskite/Perovskite Tandem Solar Cells

Enhancing the Stability and Photoluminescence Quantum Yield of CsPbX₃ (X = Cl and Br) Perovskite Nanocrystals by Treatment with Imidazolium-Based Ionic Liquids through Surface Modification

Recombination Pathways in Perovskite Solar Cells

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The benefits of ionic liquids for the fabrication of efficient and stable perovskite photovoltaics

Cited by 93 publications

References 125 publications

Improved Nanophotonic Front Contact Design for High‐Performance Perovskite Single‐Junction and Perovskite/Perovskite Tandem Solar Cells

Improved Nanophotonic Front Contact Design for High‐Performance Perovskite Single‐Junction and Perovskite/Perovskite Tandem Solar Cells

Enhancing the Stability and Photoluminescence Quantum Yield of CsPbX3 (X = Cl and Br) Perovskite Nanocrystals by Treatment with Imidazolium-Based Ionic Liquids through Surface Modification

Recombination Pathways in Perovskite Solar Cells

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Enhancing the Stability and Photoluminescence Quantum Yield of CsPbX₃ (X = Cl and Br) Perovskite Nanocrystals by Treatment with Imidazolium-Based Ionic Liquids through Surface Modification