Amphiphilic Fullerenes Employed to Improve the Quality of Perovskite Films and the Stability of Perovskite Solar Cells

Fu, Qingxia; Xiao, Shuqin; Tang, Xianglan; Chen, Yiwang; Hu, Ting

doi:10.1021/acsami.9b07149

Cited by 63 publications

(58 citation statements)

References 56 publications

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“…Energy Mater. 2020, 10,1902579 [70] a) Nonencapsulated devices, RH: relative humidity; b) Encapsulated devices or nonencapsulated devices in an argon or nitrogen atmosphere. 2019 [48] RbI (CsFAMA)Pb(IBr) 3 FTO/c-TiO 2 /m-TiO 2 /PVK/spiro-OMeTAD/Au 21.8 95% of its initial PCE after 500 h under continuous light soaking at MPPT and 85 °C a) 2016 [49] ZnCl MAPbI 3 FTO/c-TiO 2 /PVK/spiro-OMeTAD/Au 18.2 93% of its initial value after 720 h in RH 30-55% under dark b) 2017 [51] MgI 2 MAPbI 3 FTO/c-TiO 2 /m-TiO 2 /PVK/spiro-OMeTAD/Au 17.8 90% of its initial value after 600 h in RH 30-40% under dark b) 2018 [52] NiCl 2 MAPbI 3 FTO/SnO 2 /PVK/spiro-OMeTAD/Au 20.61 N/A 2018 [53] a) Encapsulated devices or nonencapsulated devices in an argon or nitrogen atmosphere, MPPT: maximum power-point tracking; b) Nonencapsulated devices.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Wang

Zhu

2019

Advanced Energy Materials

580

451

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Perovskite solar cells (PSCs) have reached a certified 25.2% efficiency in 2019 due to their high absorption coefficient, high carrier mobility, long diffusion length, and tunable direct bandgap. However, due to the nature of solution processing and rapid crystal growth of perovskite thin films, a variety of defects can form as a result of the precursor compositions and processing conditions. The use of additives can affect perovskite crystallization and film formation, defect passivation in the bulk and/or at the surface, as well as influence the interface tuning of structure and energetics. Here, recent progress in additive engineering during perovskite film formation is discussed according to the following common categories: Lewis acid (e.g., metal cations, fullerene derivatives), Lewis base based on the donor type (e.g., O‐donor, S‐donor, and N‐donor), ammonium salts, low‐dimensional perovskites, and ionic liquid. Various additive‐assisted strategies for interface optimization are then summarized; additives include modifiers to improve electron‐ and hole‐transport layers as well as those to modify perovskite surface properties. Finally, an outlook is provided on research trends with respect to additive engineering in PSC development.

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Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Wang

Zhu

2019

Advanced Energy Materials

580

451

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“…Nevertheless, excessive replacement of Pb 2+ by Ba 2+ may result in unstable perovskite structure and lead to inferior photovoltaic properties and poor morphology. To solve this problem, polymer additives, including poly(vinylidene fluoride‐co‐trifluoroethylene) [P(VDF‐TrFE)], polymethyl methacrylate (PMMA), and PEG, were added into the lead‐reduced mixed‐cation perovskite to modify the perovskite films.…”

Section: Introductionmentioning

confidence: 99%

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Chan

et al. 2020

Solar RRL

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The organic–inorganic halide perovskite solar cells (PSCs) are rapidly developed in just a few years due to its high power conversion efficiency. However, it still faces some critical issues, one of which is the presence of toxic lead (Pb2+). Recent researches show that barium (Ba2+) can partially replace the Pb2+ in perovskite structure and achieve a promising device performance because of its adequate ionic radius. However, the optimal replacement amount of Ba2+ in perovskite is still limited. Herein, the methylammonium (MA)/formamidinium (FA) mixed‐cation perovskite is used as the active layer in PSCs and Pb2+ is partially substituted with Ba2+. Compared with the pure MA system, the best device efficiency can be achieved using higher Ba2+ replacement ratio. In addition, while introducing the appropriate polymer additive, the replacement ratio can be further increased without compromise of device efficiency. Using polyethylene glycol as polymer additive, 10.0 mol% Ba‐doped MA/FA mixed‐cation PSC with an efficiency of 16.1% can be realized. It is believed that this report provides an effective strategy to fabricate high‐performance lead‐reduced PSCs.

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“…Organic materials with long alkyl chains or other hydrophobic groups could restrict the ingress of moisture. [129][130][131][132] The shielding effect can be further enhanced when conjugated and cross-linked polymers with network structures are used, which can prevent the outward ion diffusion from perovksite. [133][134][135][136] One important advantage of organic materials is their flexibility, which is benefit for the formation of compact wrapping layer around perovskites.…”

Section: Organic Barriersmentioning

confidence: 99%

“…After 40 days, the unencapsulated C60-PEG-based inverted PSCs remained 93% and 86% of the initial PCE under N 2 and ambient conditions (60% RH), respectively. [131] Zhang et al dipcoated a silane layer with long alkyl (dodecyl) chains between MAPbI 3 perovskite and Spiro-OMeTAD. The insulating alkyl chains can reduce the interfacial charge recombination, improving the PSC efficiency from 9.88% to 13.74%, and impart the perovskite a hydrophobic surface, leading to a higher moisture resistance of PSCs.…”

Section: Organic Barriers Between Perovskites and Ctlsmentioning

confidence: 99%

Barrier Designs in Perovskite Solar Cells for Long‐Term Stability

Zhang

Liu

Zhang

et al. 2020

Advanced Energy Materials

101

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Perovskite solar cells (PSCs) have attracted much attention in the past decade and their power conversion efficiency has been rapidly increasing to 25.2%, which is comparable with commercialized solar cells. Currently, the long‐term stability of PSCs remains as a major bottleneck impeding their future commercial applications. Beyond strengthening the perovskite layer itself and developing robust external device encapsulation/packaging technology, integration of effective barriers into PSCs has been recognized to be of equal importance to improve the whole device’s long‐term stability. These barriers can not only shield the critical perovskite layer and other functional layers from external detrimental factors such as heat, light, and H2O/O2, but also prevent the undesired ion/molecular diffusion/volatilization from perovskite. In addition, some delicate barrier designs can simultaneously improve the efficiency and stability. In this review article, the research progress on barrier designs in PSCs for improving their long‐term stability is reviewed in terms of the barrier functions, locations in PSCs, and material characteristics. Regarding specific barriers, their preparation methods, chemical/photoelectronic/mechanical properties, and their role in device stability, are further discussed. On the basis of these accumulative efforts, predictions for the further development of effective barriers in PSCs are provided at the end of this review.

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Amphiphilic Fullerenes Employed to Improve the Quality of Perovskite Films and the Stability of Perovskite Solar Cells

Cited by 63 publications

References 56 publications

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Additive Engineering for Efficient and Stable Perovskite Solar Cells

Polymer Additives for Morphology Control in High‐Performance Lead‐Reduced Perovskite Solar Cells

Barrier Designs in Perovskite Solar Cells for Long‐Term Stability

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