Asymmetric organic diammonium salt buried in SnO2 layer enables fast carrier transfer and interfacial defects passivation for efficient perovskite solar cells

Ma, Hongru; Wang, Minhuan; Wang, Yudi; Dong, Qingshun; Liu, Jing; Yin, Yanfeng; Zhang, Jie; Pei, Mingzhu; Zhang, Linghui; Cai, Wanxian; Shi, Lei; Tian, Wenming; Jin, Shengye; Bian, Jiming; Shi, Yantao

doi:10.1016/j.cej.2022.136291

Cited by 42 publications

(28 citation statements)

References 46 publications

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“…25−27 The built-in potential (V bi ) of the PSC plays a vital role in separation, transportation, and extraction of the photogenerated charge carriers. 28,29 For our PSCs, the V bi can be extracted using capacitance−voltage (C− V) measurements. Mott−Schottky plots from the C−V measurements are presented in Figure 5c.…”

Section: Resultsmentioning

confidence: 99%

“…With increasing H 2 O 2 volumes, the dark current densities also increase. Clearly, the 250 μL PSC exhibits the lowest dark current density, indicating the suppressed charge carrier recombination in the PSC, and can contribute to the highest PCEs in the 250 μL PSCs. − The built-in potential ( V bi ) of the PSC plays a vital role in separation, transportation, and extraction of the photogenerated charge carriers. , For our PSCs, the V bi can be extracted using capacitance–voltage ( C – V ) measurements. Mott–Schottky plots from the C – V measurements are presented in Figure c.…”

Section: Resultsmentioning

confidence: 99%

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Low Temperature Processed SnO₂ Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Cheng

et al. 2022

ACS Appl. Energy Mater.

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SnO2 has been widely recognized as an indispensable electron transporting layer for perovskite solar cells. Therefore, a lot of research interest has been paid to fabricate low temperature flexible perovskite solar cells using SnO2 electron transporting layers. Previous solution processed low temperature SnO2 electron transporting layers usually rely on presynthesized SnO2 nanocrystals or complicated post-treatments, which are quite expensive. Herein, we have demonstrated a facile solution processed method for depositing SnO2 electron transporting layers at a low temperature of 100 °C using tin oxalate and hydrogen peroxide. We find that a low volume of hydrogen peroxide is critical for depositing SnO2 electron transporting layers with superior film quality. After optimizing the hydrogen peroxide volume, perovskite solar cells using our SnO2 electron transporting layer can demonstrate a champion performance of 21.32%; at the same time, the perovskite solar cell can maintain 99.0% of its initial power conversion efficiency after storage for 60 days. Therefore, our method has great potential to be applied in flexible PSCs in the future.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Low Temperature Processed SnO₂ Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Cheng

et al. 2022

ACS Appl. Energy Mater.

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“…The results of scanning electron microscopy (SEM) and atomic force microscopy (AFM) also verified that the addition of CsF would not affect the surface morphology (Figure S6 and S7, Supporting Information), which was consistent with the previous report. [ 25 ] The conductivity and electron mobility were also estimated for the SnO 2 and CsF–SnO 2 ETLs. The device with the structure of ITO/ETLs/Al was fabricated and the related J–V curves were measured to compare the difference of conductivity (Figure S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Reduced Surface Hydroxyl and Released Interfacial Strain by Inserting CsF Anchor Interlayer for High‐Performance Perovskite Solar Cells

Wang

Chen

et al. 2022

Solar RRL

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Defects passivation strategy for the atop perovskite films is widely investigated, while the buried interface between the tin oxide electron transport layer and the perovskite active layer should gain more attention since the interfacial strains and surface hydroxyl are inevitable during the fabrication process which would affect the efficiency and stability of the fabricated perovskite devices. Herein, the CsF interlayer between SnO2 and perovskite film is adopted to release the interfacial strain and decrease the surface hydroxyl through the atomic interaction and chemical doping. Furthermore, the CsF can tailor the energy level of SnO2 for a more favorable alignment to reduce the energy loss and improve charge extraction. Correspondingly, the perovskite photovoltaic devices with the efficiency of 23.13% are achieved. Moreover, CsF‐doped devices demonstrate enhanced stability, which could maintain 87% of its initial efficiency after 1000 h under environmental storage. The developed CsF interfacial engineering provides a promising strategy for the interfacial modulation.

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“…The ETL promotes the extraction of electrons and blocks unwanted hole carriers, thus improving the photoelectric characteristics. , The selection of the inorganic ETL includes TiO 2 , ZnO, and SnO 2 . SnO 2 has been widely adopted for the fabrication of high-efficiency all-inorganic PSCs due to its low synthesis temperature (approximately 150 °C), high electron mobility, and low manufacturing cost. − However, the lattice mismatch and oxygen vacancy also exist at the ETL/perovskite interface, which greatly affects the performance of SnO 2 -based PSCs. − …”

Section: Introductionmentioning

confidence: 99%

LiF-Modified SnO₂ Electron Transport Layer Improves the Performance of Carbon-Based All-Inorganic CsPbIBr₂ Perovskite Solar Cells

et al. 2022

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SnO2 has gained wide attention because of its low synthesis temperature (approximately 150 °C), high electron mobility, and low manufacturing cost. However, the lattice mismatch at the SnO2/CsPbIBr2 interface and the oxygen vacancy leads to nonradiative recombination. Therefore, the key to improving the performance is to remove the defects between the SnO2 and the CsPbIBr2. In this paper, the first-principles calculation and experimental results show that the doping of LiF can enhance the conductivity of SnO2 films and improve the energy band alignment at the SnO2/CsPbIBr2 interface, which enhances interfacial carrier transport. Furthermore, the doping of LiF can adjust the lattice constants of the SnO2 films and decrease the lattice mismatch between SnO2 and CsPbIBr2. The results showed that the LiF-modified SnO2 used at the optimum concentration had the best power conversion efficiency (PCE) based on SnO2:LiF/perovskite of 6.58%, which is nearly 34.83% higher than that of the pure CsPbIBr2 perovskite solar cells (PSCs). This work provides an insightful strategy to improve the stability and efficiency of carbon-based all-inorganic CsPbIBr2 PSCs.

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Asymmetric organic diammonium salt buried in SnO2 layer enables fast carrier transfer and interfacial defects passivation for efficient perovskite solar cells

Cited by 42 publications

References 46 publications

Low Temperature Processed SnO₂ Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Low Temperature Processed SnO₂ Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Reduced Surface Hydroxyl and Released Interfacial Strain by Inserting CsF Anchor Interlayer for High‐Performance Perovskite Solar Cells

LiF-Modified SnO₂ Electron Transport Layer Improves the Performance of Carbon-Based All-Inorganic CsPbIBr₂ Perovskite Solar Cells

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Asymmetric organic diammonium salt buried in SnO2 layer enables fast carrier transfer and interfacial defects passivation for efficient perovskite solar cells

Cited by 42 publications

References 46 publications

Low Temperature Processed SnO2 Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Low Temperature Processed SnO2 Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Reduced Surface Hydroxyl and Released Interfacial Strain by Inserting CsF Anchor Interlayer for High‐Performance Perovskite Solar Cells

LiF-Modified SnO2 Electron Transport Layer Improves the Performance of Carbon-Based All-Inorganic CsPbIBr2 Perovskite Solar Cells

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Product

Resources

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Low Temperature Processed SnO₂ Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

Low Temperature Processed SnO₂ Electron Transporting Layer from Tin Oxalate for Perovskite Solar Cells

LiF-Modified SnO₂ Electron Transport Layer Improves the Performance of Carbon-Based All-Inorganic CsPbIBr₂ Perovskite Solar Cells