Identifying the Soft Nature of Defective Perovskite Surface Layer and Its Removal Using a Facile Mechanical Approach

Chen, Shangshang; Liu, Ye; Xiao, Xun; Yu, Zhenhua; Deng, Yehao; Dai, Xuezeng; Ni, Zhenyi; Huang, Jinsong

doi:10.1016/j.joule.2020.10.014

Cited by 96 publications

(95 citation statements)

References 40 publications

(46 reference statements)

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“…By doing so, the PL intensity of the film increased, which indicates suppression of surface nonradiative recombination. [93] This could be a useful approach for PeLED applications.…”

Section: Improving the Performance Of Leds Through Defect Passivationmentioning

confidence: 99%

Defect Passivation in Lead‐Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar Cells

et al. 2021

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Lead‐halide perovskites (LHPs), in the form of both colloidal nanocrystals (NCs) and thin films, have emerged over the past decade as leading candidates for next‐generation, efficient light‐emitting diodes (LEDs) and solar cells. Owing to their high photoluminescence quantum yields (PLQYs), LHPs efficiently convert injected charge carriers into light and vice versa. However, despite the defect‐tolerance of LHPs, defects at the surface of colloidal NCs and grain boundaries in thin films play a critical role in charge‐carrier transport and nonradiative recombination, which lowers the PLQYs, device efficiency, and stability. Therefore, understanding the defects that play a key role in limiting performance, and developing effective passivation routes are critical for achieving advances in performance. This Review presents the current understanding of defects in halide perovskites and their influence on the optical and charge‐carrier transport properties. Passivation strategies toward improving the efficiencies of perovskite‐based LEDs and solar cells are also discussed.

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“…By doing so, the PL intensity of the film increased, which indicates suppression of surface nonradiative recombination. [93] This could be a useful approach for PeLED applications.…”

Section: Improving the Performance Of Leds Through Defect Passivationmentioning

confidence: 99%

Defect Passivation in Lead‐Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar Cells

et al. 2021

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“…[ 9–11 ] In addition, nonradiative recombination centers are mainly located on surfaces because of the undercoordinated metal ions, which extremely affect the device stability and performance. [ 12–16 ] One example is that the uncoordinated Pb 2+ and halide ion defects not only militate against a high open voltage ( V oc ), but also shorten the continuous operational lifetime of PSCs, as they present vulnerable initiation sites for degradation by extrinsic environmental species. [ 17–22 ] To overcome these issues, various molecules have been used either as electron donors or as electron acceptors for passivating the defect sites on the surface and at grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Ionic‐Liquid‐Perovskite Capping Layer for Stable 24.33%‐Efficient Solar Cell

Zhu

Yang

Cao

et al. 2021

Advanced Energy Materials

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Metal‐halide perovskite has emerged as an effective photovoltaic material for its high power conversion efficiency (PCE), low cost and straightforward fabrication techniques. Unfortunately, its long‐term operational durability, mainly affected by halide ion migration and undercoordinated Pb2+ is still the bottleneck for its large‐scale commercialization. In this work, an ionic liquid (IL) is designed to effectively cap the grain surface for improved stability and reduced trap density. More specifically, the Br− in the IL passivates the undercoordinated Pb2+ by chemically bonding to it, resulting in a thin layer of ionic‐liquid‐perovskite formed on the surface, leading to improved photovoltaic performance and better stability. Specifically, the solar cell exhibits an open‐circuit voltage of 1.192 V and PCE of 24.33% under one‐sun illumination with negligible hysteresis, and a large area (10.75 cm2) integrated module achieves PCE of 20.33%. Moreover, the bare device maintains over 90% of its initial efficiency after 700 h of aging at 65 °C. It also shows outstanding stability with only about 10% degradation after being exposed to the ambient environment for 1000 h. The superior efficiency and stability demonstrate that the present IL passivating strategy is a promising approach for high‐performance large area perovskite solar cell applications.

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“…A lower RMS indicates a smoother surface, suggesting that the nonelectronic defects of the OIHP surface had been minimized after AChCl treatment. [ 63 ] The darker color of the GBs implies that they were of significantly lower height when compared with the grain interiors (GIs) of the pristine OIHP films. After being treated with AChCl, the black grain boundaries were inlaid with bright spots (marked by red circles) in Figure 3d.…”

Section: Resultsmentioning

confidence: 99%

“…Subsequently, a solution of Spiro‐OMeTAD (72.3 mg mL −1 in CB, with 17.5 µL of Li–TFSI [520 mg mL −1 in ACN] and 30 µL of tBP) was spin‐coated onto the OIHP layers at 3000 rpm for 30s. [ 63 ] Finally, a Ag electrode (≈100 nm) was deposited through vacuum evaporation on top of the Spiro‐OMeTAD layers.…”

Section: Methodsmentioning

confidence: 99%

Surface‐Anchored Acetylcholine Regulates Band‐Edge States and Suppresses Ion Migration in a 21%‐Efficient Quadruple‐Cation Perovskite Solar Cell

Zhang

Jiang

Liu

et al. 2021

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Although incorporating multiple halogen (bromine) anions and alkali (rubidium) cations can improve the open‐circuit voltage (Voc) of perovskite solar cells (PSCs), severe voltage loss and poor stability have remained pivotal limitations to their further commercialization. In this study, acetylcholine (ACh+) is anchored to the surface of a quadruple‐cation perovskite to provide additional electron states near the valence band maximum of the perovskite surface, thereby enhancing the band alignment and minimizing the Voc loss significantly. Moreover, the quaternary ammonium and carbonyl units of ACh+ passivate the antisite and vacancy defects of the organic/inorganic hybrid perovskite. Because of strong interactions between ACh+ and the perovskite, the formation of lead clusters and the migration of halogen anions in the perovskite film are suppressed. As a result, the device prepared with ACh+ post‐treatment delivers a power conversion efficiency (PCE) (21.56%) and a value of Voc (1.21 V) that are much higher than those of the pristine device, along with a twofold decrease in the hysteresis index. After storage for 720 h in humid air, the device subjected to ACh+ treatment maintained 70% of its initial PCE. Thus, post‐treatment with ACh+ appears to be a useful strategy for preparing efficient and stable PSCs.

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Identifying the Soft Nature of Defective Perovskite Surface Layer and Its Removal Using a Facile Mechanical Approach

Cited by 96 publications

References 40 publications

Defect Passivation in Lead‐Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar Cells

Defect Passivation in Lead‐Halide Perovskite Nanocrystals and Thin Films: Toward Efficient LEDs and Solar Cells

Ionic‐Liquid‐Perovskite Capping Layer for Stable 24.33%‐Efficient Solar Cell

Surface‐Anchored Acetylcholine Regulates Band‐Edge States and Suppresses Ion Migration in a 21%‐Efficient Quadruple‐Cation Perovskite Solar Cell

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