Achieving 17.46% Efficiency CsPbI2Br Perovskite Solar Cells via Multifunction Lead Chloride‐Modified ZnO Electron Transporting Layer

Li, Yaru; Zhang, Yong; Zhu, Peide; Li, Jingbai; Wu, Jiawen; Zhang, Jiyao; Zhou, Xianyong; Jiang, Zhengyan; Wang, Xingzhu; Xu, Baomin

doi:10.1002/adfm.202309010

Cited by 6 publications

(2 citation statements)

References 53 publications

(53 reference statements)

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“…reported that PbCl 2 -modified ZnO can reduce iodine defects and improve the film quality, thereby enhancing electronic extraction. 52 Electrochemical impedance spectroscopy analysis was also conducted to gain additional insights (Fig. S3†).…”

Section: Resultsmentioning

confidence: 99%

Attaining inhibition of sneak current and versatile logic operations in a singular halide perovskite memristive device by introducing appropriate interface barriers

He,

Yu,

Wang

et al. 2024

Nanoscale

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Section: Resultsmentioning

confidence: 99%

Attaining inhibition of sneak current and versatile logic operations in a singular halide perovskite memristive device by introducing appropriate interface barriers

He,

Yu,

Wang

et al. 2024

Nanoscale

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“…然而, 有机无机杂化钙钛矿中的有机阳离子如甲胺基团或甲脒基团 (methylamine, MA + ; formamidine, FA + )在高温下极易与氧或水反应, 导致钙钛矿结构最终分解为有机气体和碘化铅 [4] . 为了克服有机阳离子的不稳定性问题, 研究者转向到耐热的全无机CsPbX 3 (X为Cl, Br, I或混合卤素 )钙钛矿的研究 [5][6][7] . 如混合卤化物钙钛矿CsPbI 2 Br因其优异的热稳定以及合适的带隙 (1.90 eV), 可作为半透明太阳能电池和叠层电池中的顶电池而备受关注 [8,9] .…”

Section: 引言unclassified

Improving crystallization and photoelectric performance of CsPbI2Br perovskite under ambient air via dynamic hot-air assisted recrystallization strategy

Zhang,

Yuan,

et al. 2024

Acta Phys. Sin.

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Organic cations such as methylamine or formamidine in organic-inorganic hybrid perovskites readily reactive with oxygen or water at high temperatures, leading to the final decomposition of the perovskite structure into organic gases and lead iodide. In order to overcome the instability problem of organic cations, researchers have invested in the study of heat-resistant all inorganic CsPbX3 (X is Cl, Br, I or mixed halide) perovskites. Mixed halide perovskite CsPbI2Br, due to its excellent thermal stability and suitable bandgap (1.90 eV), has attracted much attention as a top cell in semi-transparent solar cells and tandem cells. Although high-performance CsPbI2Br solar cells could be prepared through glove boxes, this preparation method not only increased costs but also had complex manufacturing processes, unsuitable for low-cost commercial manufacturing. However, CsPbI2Br thin films prepared in ambient air were susceptible to humidity, resulting in low coverage, poor crystallization quality, numerous pinholes, and easy transformation into non perovskite phases. To overcome the trouble of pervoksite fabrication in ambient air, one feasible way is dynamic hot-air assisted strategy to reduce the moisture around the films as much as possible. However, the hot air accelerated the evaporation rate of solvent, resulting in a decrease of grain size. In order to improve the issues of crystal growth and long-term stability in dynamic hot-air assisted strategy, in this work, we present a dynamic hot-air assisted recrystallization (DHR) strategy to prepare high-quality CsPbI2Br thin films in ambient air (i.e., the CsPbI2Br thin films prepared via dynamic hot-air strategy were recrystallized using a green solvent (methylamine acetate) with high viscosity coefficient). Under ambient air with high humidity (RH＞60%), the CsPbI2Br thin film with high coverage, (100) preferred orientation, large average grain size, and stable structure has been prepared via DHR strategy. The dynamic hot-air process could effectively reduce the moisture around the film and increase the nucleation sites in the precursor solution, thereby improving the coverage of the film. However, this process inevitably resulted in the significantly decrease of grain size (Rave= 0.32 μm) (i.e., more grain boundaries), exacerbating non-radiative recombination of carriers associated with trap states at these boundaries. The high coverage increased the grain-to-grain contact areas, facilitating complete recrystallization. Thus, the recrystallization process could significantly increase the grain size (Rave=2.63 μm) and obtain a (100) preferred orientation (I(110)/I(200)=0.006), resulting in high photoluminescence intensity and long fluorescence lifetime (118 ns). The unencapsulated CsPbI2Br perovskite solar cell (PSC) optimized via DHR strategy with low hysterescence factor (2.34%) and high repeatability exhibits a high power conversion efficiency (PCE=17.55%), which is higher than those of most CsPbI2Br PSCs prepared in ambient air and gloveboxes previously reported. Moreover, the unencapsulated CsPbI2Br PSC possesses an excellent storage stability under ambient air with high humidity (RH>60%), remaining 96% of the original PCE after aging 40 days. This provides a promising approach to achieve high-performance and long-term stable CsPbI2Br films under ambient air with high humidity, which is expected to promote the commercialization process of perovskite/silicon tandem cells and semi-transparent devices.

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Organic‐Hydrochloride‐Modified ZnO Electron Transport Layer for Efficient Defect Passivation and Stress Release in Rigid and Flexible all Inorganic Perovskite Solar Cells

Xu,

Tang,

Xiong

et al. 2024

Small

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All inorganic CsPbI2Br perovskite (AIP) has attracted great attention due to its excellent resistance against thermal stress as well as the remarkable capability to deliver high‐voltage output. However, CsPbI2Br perovskite solar cells (PeSCs) still encounter critical challenges in attaining both high efficiency and mechanical stability for commercial applications. In this work, formamidine disulfide dihydrochloride (FADD) modified ZnO electron transport layer (ETL) has been developed for fabricating inverted devices on either rigid or flexible substrate. It is found that the FADD modification leads to efficient defects passivation, thereby significantly reducing charge recombination at the AIP/ETL interface. As a result, rigid PeSCs (r‐PeSCs) deliver an enhanced efficiency of 16.05% and improved long‐term thermal stability. Moreover, the introduced FADD can regulate the Young's modulus (or Derjaguin‐Muller‐Toporov (DMT) modilus) of ZnO ETL and dissipate stress concentration at the AIP/ETL interface, effectively restraining the crack generation and improving the mechanical stability of PeSCs. The flexible PeSCs (f‐PeSCs) exhibit one of the best performances so far reported with excellent stability against 6000 bending cycles at a curvature radius of 5 mm. This work thus provides an effective strategy to simultaneously improve the photovoltaic performance and mechanical stability.

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Achieving 17.46% Efficiency CsPbI₂Br Perovskite Solar Cells via Multifunction Lead Chloride‐Modified ZnO Electron Transporting Layer

Cited by 6 publications

References 53 publications

Attaining inhibition of sneak current and versatile logic operations in a singular halide perovskite memristive device by introducing appropriate interface barriers

Attaining inhibition of sneak current and versatile logic operations in a singular halide perovskite memristive device by introducing appropriate interface barriers

Improving crystallization and photoelectric performance of CsPbI<sub>2</sub>Br perovskite under ambient air via dynamic hot-air assisted recrystallization strategy

Organic‐Hydrochloride‐Modified ZnO Electron Transport Layer for Efficient Defect Passivation and Stress Release in Rigid and Flexible all Inorganic Perovskite Solar Cells

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