Two birds with one stone: Simultaneous realization of constructed 3D/2D heterojunction and p-doping of hole transport layer for highly efficient and stable perovskite solar cells

Wang, Shibo; Cao, Fengxian; Chen, Pengxu; He, Ruowei; Tong, Anling; Lan, Zhang; Gao, Peng; Sun, Weihai; Wu, Jihuai

doi:10.1016/j.cej.2022.139721

Cited by 23 publications

(11 citation statements)

References 61 publications

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“…To understand the differences in the degradation of the PSCs, we performed XRD measurements on the aged perovskite films (Figure S16). We observe that in the case of the aged untreated perovskite film, the dominant perovskite diffraction peak at 13.9° is reduced after 2160 h, with the decomposition yielding non‐photoactive δ‐FAPbI 3 and PbI 2 , evidenced by the significant increase in the peaks at 11.6° and 12.7°, respectively 50 . In contrast, the decomposition of the perovskite film treated with NaHCO 3 is suppressed, with a smaller reduction of the peak intensity of α‐FAPbI 3 and only a slightly enhanced PbI 2 peak.…”

Section: Resultsmentioning

confidence: 84%

“…We observe that in the case of the aged untreated perovskite film, the dominant perovskite diffraction peak at 13.9 is reduced after 2160 h, with the decomposition yielding non-photoactive δ-FAPbI 3 and PbI 2 , evidenced by the significant increase in the peaks at 11.6 and 12.7 , respectively. 50 In contrast, the decomposition of the perovskite film treated with NaHCO 3 is suppressed, with a smaller reduction of the peak intensity of α-FAPbI 3 and only a slightly enhanced PbI 2 peak. The improved stability of NaHCO 3 -treated perovskite is mainly attributed to reduced defect with improved crystallinity as previously demonstrated.…”

Section: Resultsmentioning

confidence: 95%

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NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

Du,

Wang,

et al. 2023

InfoMat

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Driven by their many unique features, perovskite solar cells (PSCs) have become one of the most promising candidates in the photovoltaic field. Twostep preparation of perovskite film is advantageous for its higher stability and reproducibility compared to the one-step method, which is more suitable for practical application. However, the incomplete conversion of the dense lead iodide (PbI 2 ) layer during the sequential spin-coating of formamidinium/ methylammonium (FA + /MA + ) organic amine salts severely affect the performance of PSCs. Herein, sodium bicarbonate (NaHCO 3 ) is used to induce the formation of porous PbI 2 , which facilitates the penetration of the FA + /MA + ions and the formation of a perovskite film with high crystallinity and large grain microstructure. Meanwhile, the introduction of Na + not only improves the energetic alignment of the PSC, but also increases the conductivity via pdoping. As a result, the optimized NaHCO 3 -modified PSC achieves a champion power conversion efficiency of 24.0% with suppressed hysteresis. Moreover, the significant reduction in defect density and ion migration as well as a mild alkaline environment enhance the stability of device. The unencapsulated NaHCO 3 -modified PSCs maintain over 90% of their original efficiency upon storage in ambient air (30%-40% relative humidity) for 2160 h. We have demonstrated an ingenious strategy for controlling the quality of perovskite and improving the performance of device by low-temperature foaming of simple inorganic molecules of NaHCO 3 .lead iodide (PbI 2 ), perovskite solar cell, porous materials, sodium bicarbonate (NaHCO 3 ), two-step deposition Yitian Du and Ying Wang contributed equally to this study.

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Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 95%

NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

Du,

Wang,

et al. 2023

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“…As shown in Figure a, the core XPS spectra of the control film exhibit distinct doublet peaks at 138.4 and 143.3 eV, which are ascribed to the binding energy of the Pb 4f 7/2 and Pb 4f 5/2 , respectively. [ 28 ] Comparatively, the corresponding peaks of the target film shift toward higher binding energy to 138.6 and 143.5 eV, respectively. In contrast, the I 3d core spectra of the target film shift by 0.2 eV toward lower binding energy versus the control film (Figure 2b).…”

Section: Resultsmentioning

confidence: 99%

Bidirectional Targeted Therapy Enables Efficient, Stable, and Eco‐Friendly Perovskite Solar Cells

Song

Zhang

et al. 2023

Adv Funct Materials

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Perovskite solar cells (PSCs) have witnessed rapid development toward commercialization based on their superior efficiency except for some remained misgivings about their poor stability primarily originating from interfacial problems. Robust back interface for neutralization of crystal defects, depression of dopant lithium ions (Li+) diffusion, and even inhibition of toxic lead (Pb) leakage is highly desirable; however, it remains a great challenge. Herein, a cost‐effective interfacial therapy approach is developed to simultaneously alleviate the obstacles aforementioned. A small molecule, 1,4‐dithiane with unique chair structure, is adapted to interact with under‐coordinated Pb2+ on perovskite surface and Li+ from hole transport layer, neutralizing interfacial defects and suppressing Li+ diffusion. Besides, the presence of 1,4‐dithiane can efficiently modulate interfacial energetics, enhance hydrophobicity of PSCs, and anchor Pb atoms via SPb bond. Consequently, the target devices perform better than control devices when exposed to light‐soaking, moisture, and thermal stress owing to the synergistic suppression of trap‐state density, ions migration, and moisture permeation. The optimized target device delivers a champion efficiency of 23.27% with mitigated Pb leakage. This study demonstrates a promising functionalized modification strategy for constructing efficient, stable, and eco‐friendly PSCs.

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Section: Resultsmentioning

confidence: 99%

“…Compared to the control film, the shorter lifetime for the film with DMSO indicates more efficient charge transport and extraction, which can be ascribed to the vertical crystal orientation. [44] Figure 2e shows the UV-vis absorption spectra of the films. Several excitonic absorption peaks can be observed at around 569, 604, and 640 nm, which can be assigned to n = 2, 3, and 4 RPP phases, respectively.…”

Section: Resultsmentioning

confidence: 99%

High‐Quality Lead Acetate–Based Ruddlesden–Popper Perovskite Films for Efficient Solar Cells

Wen

Zheng

et al. 2023

Solar RRL

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The 2D Ruddlesden–Popper perovskites (RPPs), consisting of alternating organic spacer layers and inorganic layers, are emerging photovoltaic materials because of their highly tunable optoelectronic properties and improved stability compared to their 3D counterparts. Nonhalide lead sources attract increasing attention in 3D perovskites, whereas the lead sources for RPPs are limited to lead halides. Herein, nonhalide lead source of lead acetate is investigated for high‐quality RPP films by a dimethyl sulfoxide (DMSO)‐assisted delayed annealing process. The incorporation of DMSO in the lead acetate–based precursor solution regulates the crystallization process, resulting in RPP films with distinctly enhanced crystallinity, reduced trap density, vertical crystal orientation, and graded phase distribution. Consequently, the optimized RPP solar cell with an inverted planar structure delivers a champion power conversion efficiency of 17.3%. Herein, future developments of nonhalide lead sources are spurred to fabricate RPP films with high device performance.

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Two birds with one stone: Simultaneous realization of constructed 3D/2D heterojunction and p-doping of hole transport layer for highly efficient and stable perovskite solar cells

Cited by 23 publications

References 61 publications

NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

Bidirectional Targeted Therapy Enables Efficient, Stable, and Eco‐Friendly Perovskite Solar Cells

High‐Quality Lead Acetate–Based Ruddlesden–Popper Perovskite Films for Efficient Solar Cells

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Two birds with one stone: Simultaneous realization of constructed 3D/2D heterojunction and p-doping of hole transport layer for highly efficient and stable perovskite solar cells

Cited by 23 publications

References 61 publications

NaHCO3‐induced porous PbI2 enabling efficient and stable perovskite solar cells

NaHCO3‐induced porous PbI2 enabling efficient and stable perovskite solar cells

Bidirectional Targeted Therapy Enables Efficient, Stable, and Eco‐Friendly Perovskite Solar Cells

High‐Quality Lead Acetate–Based Ruddlesden–Popper Perovskite Films for Efficient Solar Cells

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NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells

NaHCO₃‐induced porous PbI₂ enabling efficient and stable perovskite solar cells