A synchronous defect passivation strategy for constructing high-performance and stable planar perovskite solar cells

Sun, Yansen; Pang, Zhenyu; Quan, Yingnan; Han, Donglai; Zhang, Mengjie; Ge, Xin; Wang, Fengyou; Sun, Yunfei; Yang, Jing; Yang, Lili

doi:10.1016/j.cej.2020.127387

Cited by 48 publications

(61 citation statements)

References 62 publications

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“…The O 1s peak indicates that 531.6 eV comes from the oxygen vacancies in the SnO 2 ETL and 530.5 eV comes from the OÀSnÀO combination in the SnO 2 ETL. [12] The proportion S1, Supporting Information. The results suggest that the interaction between the modified molecule Cl-indole and Sn 4þ help to reduce the surface defects of SnO 2 ETL, such as oxygen vacancies.…”

Section: Resultsmentioning

confidence: 99%

“…In comparison with the SnO 2 /perovskite sample, the fluorescence intensity of the perovskite film based on SnO 2 /indole and SnO 2 /Cl-indole is reduced and has a more significant quenching effect, indicating that the perovskite layer has effective electron transfer and extraction. [12] The time-resolved PL (TRPL) curve of the corresponding sample is displayed in Figure 3b. We use a double-exponential decay function to fit the spectrum and calculate the average carrier lifetime (τ ave ) by the following equation.…”

Section: Resultsmentioning

confidence: 99%

“…[44] In addition, compared with the pristine device, the leakage current in the dark JÀV curve of the PSCs modified with indole or Cl-indole is reduced (Figure 3f ), indicating that the addition of the modifier suppresses the nonradiative recombination of the devices. [12,45] To examine the effect of modification on the quality of perovskite film, the defect density of perovskite film was quantitatively calculated via the spaceÀcharge-limited current (SCLC) technology (Figure S7, Supporting Information). The n trap is calculated by the formula [46]…”

Section: Resultsmentioning

confidence: 99%

“…The interface modification adjusts the carrier interface transport dynamics, reduces the carrier accumulation and imbalance, and mitigates the hysteresis effect. [12] Reproducibility and stability are key properties of PSCs. We prepared and measured a batch of 20 PSC devices with different modifiers (Figure S11, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…[8,10,11] Notwithstanding, defects and oxygen vacancies occurred during the preparation of SnO 2 thin films, which led to the generation of nonradiative recombination and deteriorated the PV performance of the device. [12][13][14][15][16] Therefore, the modification of SnO 2 ETL has become a hot topic today.…”

Section: Introductionmentioning

confidence: 99%

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5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

Wang

et al. 2022

Solar RRL

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Interface engineering has been proven to be an effective method to improve the performance and stability of perovskite solar cells (PSCs). Herein, 5‐chloroindole (Cl‐indole) is introduced into the interface of a SnO2 electron transport layer and perovskite light‐absorbing layer to improve the photovoltage performance of the device. The results show that Cl−indole can not only form hydrogen bonds with iodine in the perovskite to optimize the interface contact but also coordinate and passivate the Pb2+ and Sn4+ interface defects to alleviate carrier nonradiative recombination. Compared with the pristine SnO2‐based planar PSCs with a power conversion efficiency (PCE) of 20.58%, the Cl−indole‐modified SnO2‐based device achieves a PCE of 22.47%. Meanwhile, the stability of the modified device is effectively improved and the hysteresis effect is reduced. This work demonstrates a promising strategy for high‐efficient and stable PSCs by optimizing interface contact and passivating interface defects.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

Wang

et al. 2022

Solar RRL

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Multifunctional Aminoglycoside Antibiotics Modified SnO₂ Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

Yan

Zhang

et al. 2023

Adv Funct Materials

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SnO 2 as an electron transport layer (ETL) has been widely used in regular planar perovskite solar cells (PSCs) owing to its high optical transmittance, less photocatalytic activity, and low-temperature processing. However, SnO 2 -based PSCs still face many challenges which greatly impair their efficiency and stability of PSCs. Herein, a novel and effective multifunctional modification strategy is proposed by incorporating streptomycin sulfate (STRS) molecules with multiple functional groups into SnO 2 ETL. STRS can significantly suppress SnO 2 nanoparticle agglomeration, improve the electronic property of SnO 2 , as well as reduce nonradiative recombination. At the same time, interfacial residual tensile stress is released and the interfacial energy level alignment becomes more matched. As a result, the STRS-modified PSCs achieve a higher efficiency of 22.89% compared to 20.61% of the control device and exhibit a hysteresis-free feature. The humidity and thermal stability of PSCs based on STRS-SnO 2 are significantly improved. Furthermore, the efficiency of flexible devices increased from 19.74% to 20.79%, and the devices still maintain >80% of initial PCE after 4500 bending cycles with a bend radius of 5 mm. This study provides a low-cost, facile, and efficient strategy for achieving high efficiency and stability in PSCs.

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Advances in SnO₂ for Efficient and Stable n–i–p Perovskite Solar Cells

2022

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minimize interfacial charge accumulation and recombination. [9] In an n-i-p-structured PSC, the perovskite layer is coated on the n-type ETL, and the surface area and surface chemistry of the ETL directly affect the deposition and quality of the perovskite layer. Thus, ETL development has become one of the most important scientific subjects for developing highly efficient and stable n-i-p PSCs.To date, the commonly studied ETLs include n-type semiconducting oxides (e.g., TiO 2 , SnO 2 , ZnO, Zn 2 SnO 4 , and BaSnO 3 ) and organics (e.g., phenyl-C 61 -butyric acid methyl ester [PCBM] and C 60 ). [7,[10][11][12][13][14][15][16][17] Key properties of ETLs include the proper band energy alignment with perovskite layer, high transmittance with wide bandgap, and high conductivity. Traditionally, the compact TiO 2 / mesoporous TiO 2 stack was a key component in efficient n-i-p PSCs, owing to its well-established deposition methods and suitable optoelectronic properties. However, TiO 2 exhibits drawbackssuch as photo catalytic properties under illumination and hightemperature annealing required to achieve proper crystallinitywhich can limit PSCs for commercialization. [18] Many researchers have explored alternative candidates to replace TiO 2 , targeting simple and low-temperature fabrication processes with low cost, good reproducibility, and high chemical stability.Among various candidates, SnO 2 stands out as a promising ETL that has received significant attention in recent years, [19][20][21][22] with the best PCE of SnO 2 -based n-i-p PSCs exceeding 25%. [23] The SnO 2 ETL often exhibits several preferred features such as wide bandgap with high transmittance, good charge mobility, proper band offsets relative to common perovskites, low-temperature processable synthesis, and decent chemical stability, all of which make SnO 2 ETLs great candidates for highly efficient and stable PSCs. [24,25] In this review, we highlight the main advances in the develop ment of SnO 2 for highly efficient and stable PSCs, with a focus on the n-i-p device configuration. To help understand the research trend of SnO 2 -based PSCs, we first provide an overview of key approaches leading to record PCEs based on the development of SnO 2 deposition methods in recent years. Next, we focus on the materials chemistry associated with SnO 2 , including defects, intrinsic properties, and impact on device characteristics. We discuss the issues and challenges related to SnO 2 development and SnO 2 /perovskite interface optimization, as well as various strategies developed to address these issues in recent years. We also highlight some SnO 2 implementations related to scalable processes and flexible devices that are Perovskite solar cells (PSCs) based on the regular n-i-p device architecture have reached above 25% certified efficiency with continuously reported improvements in recent years. A key common factor for these recent breakthroughs is the development of SnO 2 as an effective electron transport layer in these devices. In this article, the key ad...

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A synchronous defect passivation strategy for constructing high-performance and stable planar perovskite solar cells

Cited by 48 publications

References 62 publications

5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

Multifunctional Aminoglycoside Antibiotics Modified SnO₂ Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

Advances in SnO₂ for Efficient and Stable n–i–p Perovskite Solar Cells

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A synchronous defect passivation strategy for constructing high-performance and stable planar perovskite solar cells

Cited by 48 publications

References 62 publications

5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

5‐Chloroindole as Interface Modifier to Improve the Efficiency and Stability of Planar Perovskite Solar Cells

Multifunctional Aminoglycoside Antibiotics Modified SnO2 Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

Advances in SnO2 for Efficient and Stable n–i–p Perovskite Solar Cells

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Product

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Multifunctional Aminoglycoside Antibiotics Modified SnO₂ Enabling High Efficiency and Mechanical Stability Perovskite Solar Cells

Advances in SnO₂ for Efficient and Stable n–i–p Perovskite Solar Cells