Encapsulation of Perovskite Solar Cells for High Humidity Conditions

Dong, Qin; Liu, Fangzhou; Wong, Man‐Hon; Tam, Ho Won; Djurišić, Aleksandra B.; Ng, Annie; Surya, C.; Chan, Wai Kin; Ng, Alan Man Ching

doi:10.1002/cssc.201600868

Cited by 183 publications

(137 citation statements)

References 46 publications

(128 reference statements)

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“…Such nanostructured oxide charge transporters offer tunability in multiple aspects, including quantum-confined bandgaps, large surface areas, and doping densities. [225] During the testing period, the average efficiency decreased from 15.3% to 12.2% over the first 6 hours, after which a stabilized efficiency of 11% was observed. [237] Some reports have proposed that oriented nanorods/ nanowires consisting of TiO 2 and ZnO can promote electron transport and suppress charge recombination.…”

Section: Discussionmentioning

confidence: 99%

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Haque

Sheikh

Guan

et al. 2017

Advanced Energy Materials

165

121

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Over the past few years, hybrid halide perovskites have emerged as a highly promising class of materials for photovoltaic technology, and the power conversion efficiency of perovskite solar cells (PSCs) has accelerated at an unprecedented pace, reaching a record value of over 22%. In the context of PSC research, wide‐bandgap semiconducting metal oxides have been extensively studied because of their exceptional performance for injection and extraction of photo‐generated carriers. In this comprehensive review, we focus on the synthesis and applications of metal oxides as electron and hole transporters in efficient PSCs with both mesoporous and planar architectures. Metal oxides and their doped variants with proper energy band alignment with halide perovskites, in the form of nanostructured layers and compact thin films, can not only assist with charge transport but also improve the stability of PSCs under ambient conditions. Strategies for the implementation of metal oxides with tailored compositions and structures, and for the engineering of their interfaces with perovskites will be critical for the future development and commercialization of PSCs.

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Section: Discussionmentioning

confidence: 99%

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Haque

Sheikh

Guan

et al. 2017

Advanced Energy Materials

165

121

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“…Perovskite can easily degrade and lose its optoelectronic properties in the presence of oxygen and moisture, which are the primary causes leading to perovskite decomposition and degradation . Significant effort has been focused on addressing stability issues of perovskite materials via various strategies such as material compositional tuning, crystal structure modification, etc . Among various approaches, encapsulation is a possible method to isolate the device with the possible degradation factors, which have already been applied to enhance the stability of perovskite solar cells.…”

Section: Improving Stabilitymentioning

confidence: 99%

Hybrid Organic–Inorganic Perovskite Photodetectors

Tian

Zhou

2017

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398

277

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Hybrid organic-inorganic perovskite materials garner enormous attention for a wide range of optoelectronic devices. Due to their attractive optical and electrical properties including high optical absorption coefficient, high carrier mobility, and long carrier diffusion length, perovskites have opened up a great opportunity for high performance photodetectors. This review aims to give a comprehensive summary of the significant results on perovskite-based photodetectors, focusing on the relationship among the perovskite structures, device configurations, and photodetecting performances. An introduction of recent progress in various perovskite structure-based photodetectors is provided. The emphasis is placed on the correlation between the perovskite structure and the device performance. Next, recent developments of bandgap-tunable perovskite and hybrid photodetectors built from perovskite heterostructures are highlighted. Then, effective approaches to enhance the stability of perovskite photodetector are presented, followed by the introduction of flexible and self-powered perovskite photodetectors. Finally, a summary of the previous results is given, and the major challenges that need to be addressed in the future are outlined. A comprehensive summary of the research status on perovskite photodetectors is hoped to push forward the development of this field.

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“…On the other hand, we have first demonstrated a surface functionalization method of MAPbI 3 (MA = CH 3 NH 3 + ) film with tetra-alkyl ammonium molecules which could tremendously enhance the humid stability of the perovskite device even under very harsh condition (90% relative humidity). [23][24][25][26] However, it was found that the organic layers with insulated alkyl groups usually limit the carrier extraction and thus result in slight loss of PCEs in our experiments.To protect the perovskite devices with high efficiency, surface-functionalized molecules must combine excellent electrical conductivity and hydrophobic properties. In addition, encapsulation was another effective way to protect perovskites form degradation induced by ambient moisture.…”

mentioning

confidence: 60%

Surface Electronic Modification of Perovskite Thin Film with Water‐Resistant Electron Delocalized Molecules for Stable and Efficient Photovoltaics

Wen

Yang

Liu

et al. 2018

Advanced Energy Materials

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tuning strategy [14,15] with improved moisture tolerance. On the other hand, we have first demonstrated a surface functionalization method of MAPbI 3 (MA = CH 3 NH 3 + ) film with tetra-alkyl ammonium molecules which could tremendously enhance the humid stability of the perovskite device even under very harsh condition (90% relative humidity). [16] Furthermore, a series of hydrophobic molecules, such as alkylphos phonic acid ω-ammonium chloride, [17] dodecyltrimethoxysilane (C 12 -silane), [18] polystyrene, [19,20] polymethyl methacrylate, [21] and phenylethylammonium iodide, [22] were developed to enhance the moisture tolerance of perovskites. In addition, encapsulation was another effective way to protect perovskites form degradation induced by ambient moisture. [23][24][25][26] However, it was found that the organic layers with insulated alkyl groups usually limit the carrier extraction and thus result in slight loss of PCEs in our experiments.To protect the perovskite devices with high efficiency, surface-functionalized molecules must combine excellent electrical conductivity and hydrophobic properties. Among various molecules, thiophene derivatives enable the electron-rich conjugated π system, which consist of four 2p orbital electrons from carbon atoms and two lone electron pairs from sulfur atom. [27] These thiophene-based derivatives or polythiophene derivatives are usually used as sufficient hole extraction materials, together with the advantage of their highest occupied molecular orbital (HOMO). [28] Moreover, unlike siloxanes and amines, thiophenes can be directly coordinated to the lead atom by the lone pair of electrons offered by the sulfur atom, which may be directly interacted with the valance band of perovskite. [29] Therefore, if we modify perovskite surface with such molecules, device with high efficiency and stability is expected.In this work, we reported a new strategy to fabricate moisturetolerant and high-performance PSCs by employing 3-alkylthiophene derivatives as the multifunctional surface layer. This class of molecules contains unique delocalized conjugated π systems and hydrophobic alkyl groups that can enhance the charge transfer at perovskite/2,2′-7,7′-tetrakis[N,N-di(4-methoxyphenyl) amino]-9,9′-spirobifluorene (Spiro-OMeTAD) interface and protect the inner perovskite. Planar heterojunction devices utilizing Although the efficiency of perovskite solar cells (PSCs) is close to crystalline silicon solar cells, the instability of perovskite, especially in humid condition, still hinders its commercialization. As an effective method to improve their stability, surface functionalization, by using hydrophobic molecules, has been extensively investigated, but usually accompanied with the loss of device efficiencies owing to their intrinsic electrical insulation. In this work, for the first time, it is demonstrated that 3-alkylthiophene-based hydrophobic molecules can be used as both water-resistant and interface-modified layers, which could simultaneously enhance both stability and perform...

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Encapsulation of Perovskite Solar Cells for High Humidity Conditions

Cited by 183 publications

References 46 publications

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Metal Oxides as Efficient Charge Transporters in Perovskite Solar Cells

Hybrid Organic–Inorganic Perovskite Photodetectors

Surface Electronic Modification of Perovskite Thin Film with Water‐Resistant Electron Delocalized Molecules for Stable and Efficient Photovoltaics

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