Achieving long-term stable perovskite solar cells via ion neutralization

Back, Hyungcheol; Kim, Geunjin; Kim, Junghwan; Kong, Jaemin; Kim, Tae Kyun; Kang, Hongkyu; Kim, Hee Joo; Lee, Jinho; Lee, Seongyu; Lee, Kwang-Hee

doi:10.1039/c6ee00612d

Cited by 296 publications

(221 citation statements)

References 33 publications

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“…2(b)). 55 Greater electrode stability could also be achieved by Guerrero et al by moving away from using either Ag or Al, and instead employing a Cr 2 O 3 /Cr electrode which is shown to be chemically inert towards iodide. 58 Similarly, Au electrodes do not undergo any corrosion; however, the price of the metal is prohibitively high for large-scale commercialization.…”

mentioning

confidence: 97%

“…However, several studies have shown that another source for device impairment is chemical reactions between the iodide ions from the perovskite and the metal electrode, typically Ag or Al. [55][56][57][58] This can result in the formation of an insulating barrier such as Ag- which will impair charge extraction at this electrode. 59 Long-term operability of these devices requires therefore, that, additionally to moisture ingress from the outside, the diffusion of ions from the perovskite to the electrode is blocked in order to avoid electrode corrosion.…”

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confidence: 99%

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Research Update: Strategies for improving the stability of perovskite solar cells

et al. 2016

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The power-conversion efficiency of perovskite solar cells has soared up to 22.1% earlier this year. Within merely five years, the perovskite solar cell can now compete on efficiency with inorganic thin-film technologies, making it the most promising of the new, emerging photovoltaic solar cell technologies. The next grand challenge is now the aspect of stability. The hydrophilicity and volatility of the organic methylammonium makes the work-horse material methylammonium lead iodide vulnerable to degradation through humidity and heat. Additionally, ultraviolet radiation and oxygen constitute stressors which can deteriorate the device performance. There are two fundamental strategies to increasing the device stability: developing protective layers around the vulnerable perovskite absorber and developing a more resilient perovskite absorber. The most important reports in literature are summarized and analyzed here, letting us conclude that any long-term stability, on par with that of inorganic thin-film technologies, is only possible with a more resilient perovskite incorporated in a highly protective device design.

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confidence: 97%

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confidence: 99%

Research Update: Strategies for improving the stability of perovskite solar cells

et al. 2016

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“…[133] With the NiMgLiO-based HTM, a large-size (1.02 cm 2 ) planar p-i-n perovskite solar cell with an efficiency of up to 16.2% was achieved. Back et al developed a new concept of a chemical inhibition layer in PVSCs by using amine-mediated metal oxide (AM-TiO x ) between PCBM and Ag electrode, [134] which can successfully protect the Ag electrodes by extracting and stabilizing the ionic defects migrating from the perovskite layer, thereby realizing planar p-i-n PVSCs with long-term stability. ZnO was also used for optimizing the contact properties of the PCBM/Ag interface.…”

Section: Inorganic Metal Oxidesmentioning

confidence: 99%

“…Many people reported that the introduction of interfacial materials containing amine groups at the ETM/Ag electrode interface could neutralize the migrating iodide ions and inhibit the formation of the insulating Ag-I bonds on the surface of the Ag electrode, resulting in highly stable PVSC devices. [134,150] Another solution is replacing Ag electrodes to other stable metals. Copper (Cu) may be an ideal electrode material, which is stable even in direct contact with perovskite for many years, and there is no notable diffusion of Cu into the perovskite.…”

Section: Wwwadvenergymatdementioning

confidence: 99%

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Yang

Meng

Yang

2017

Advanced Energy Materials

370

265

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Organic‐inorganic halide perovskite materials have become a shining star in the photovoltaic field due to their unique properties, such as high absorption coefficient, optimal bandgap, and high defect tolerance, which also lead to the breathtaking increase in power conversion efficiency from 3.8% to over 22% in just seven years. Although the highest efficiency was obtained from the TiO2 mesoporous structure, there are increasing studies focusing on the planar structure device due to its processibility for large‐scale production. In particular, the planar p‐i‐n structure has attracted increasing attention on account of its tremendous advantages in, among other things, eliminating hysteresis alongside a competitive certified efficiency of over 20%. Crucial for the device performance enhancement has been the interface engineering for the past few years, especially for such planar p‐i‐n devices. The interface engineering aims to optimize device properties, such as charge transfer, defect passivation, band alignment, etc. Herein, recent progress on the interface engineering of planar p‐i‐n structure devices is reviewed. This review is mainly focused on the interface design between each layer in p‐i‐n structure devices, as well as grain boundaries, which are the interfaces between polycrystalline perovskite domains. Promising research directions are also suggested for further improvements.

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“…Metal-organic hybrid perovskite solar cells have been extensively studied by many researchers all over the world and its power conversion efficiency (PCE) reaches over 20%, recently [1][2][3]. The fabrication methods of perovskite film are classified mainly into two method: one is a solution growth method from precursor solutions of PbI2 and MAI or their mixed solution by a spincoating technique, and another is a vapour growth method by conversion of perovskite phase from PbI2 films by annealing under methyl ammonium iodide (MAI) vapour.…”

Section: Introductionmentioning

confidence: 99%

Conversion of metal-organic halide perovskite from PbI2 precursor films grown by hot-wall method

2018

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Abstract. We report on metal-organic halide perovskite CH3NH3PbI3 films converted from PbI2 precursors for planar heterojunction perovskite solar cells. PbI2 films as a precursor were deposited by hot-wall method and conventional vacuum evaporation. The conversion to perovskite phase from the PbI2 films were performed by annealing in methyl ammonium iodine (MAI) vapour at 120-150 o C. We confirmed that no residual PbI2 phase can be detected in the converted perovskite films by x-ray diffraction measurements. The surface morphology of the perovskite films was measured by AFM. Roughness Ra of the films is 17.8 nm, which is comparable value to the reported ones. Using the converted perovskite films we fabricated tentative perovskite solar cells with a device architecture of ITO/PEDOT:PSS/Perovskite/C60/Ag. The power conversion efficiencies of the fabricated solar cells from a conventional evaporation and the hot-wall method exhibited 2.22 and 2.33%, respectively.

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Achieving long-term stable perovskite solar cells via ion neutralization

Abstract: Corrosive ionic defects in perovskite films degrade perovskite solar cells (PSCs) and long-term stable PSCs are realized by neutralizing the defects.

Cited by 296 publications

References 33 publications

Research Update: Strategies for improving the stability of perovskite solar cells

Research Update: Strategies for improving the stability of perovskite solar cells

Interface Engineering for Highly Efficient and Stable Planar p‐i‐n Perovskite Solar Cells

Conversion of metal-organic halide perovskite from PbI2 precursor films grown by hot-wall method

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