Enhanced performance and stability of ambient-processed CH3NH3PbI3-x(SCN)x planar perovskite solar cells by introducing ammonium salts

Li, Yuzhu; Zhang, Zongbao; Zhou, Yang; Xie, Lai; Gao, Naitao; Lu, Xubing; Gao, Xingsen; Gao, Jinwei; Shui, Lingling; Wu, Sujuan; Liu, Junming

doi:10.1016/j.apsusc.2020.145790

Cited by 15 publications

(9 citation statements)

References 59 publications

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“…It was reported that the SCN − boosted the crystallinity and fostered large grain size, mitigated trap states and recombination with the reduction of I − vacancies, and formed a uniform MAPbI 3−x (SCN) x perovskite film. 155 As a result, the device with the I − /SCN − mixture at the X site preserved 80% of the original PCE of 16.61% in air after 720 h. Adopting acetate ions (OAc − ) to replace partial I − ions also considerably improves the stability of PSCs owing to high crystallinity and the bonding with uncoordinated Pb. The MAPbI 3−x (OAc) x based PSC realized a PCE of 18.28% and remained at 84% of the original PCE under 70% humidity after 800 h. 156 The reason for the high performance is that the OAc − promotes crystallinity and increases grain sizes, leading to uniform and pinhole-free MAPbI 3−x (OAc) x perovskite film.…”

Section: Ion Engineeringmentioning

confidence: 99%

“…For example, substituting SCN anion for I – ion facilitates the stability of PSCs due to the prevention of the formation of I – vacancies. It was reported that the SCN – boosted the crystallinity and fostered large grain size, mitigated trap states and recombination with the reduction of I – vacancies, and formed a uniform MAPbI 3– x (SCN) x perovskite film …”

Section: Ion Engineeringmentioning

confidence: 99%

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Achieving Resistance against Moisture and Oxygen for Perovskite Solar Cells with High Efficiency and Stability

Chi

Banerjee

2021

Chem. Mater.

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Realization of high efficiency along with long-term stability of perovskites solar cells has been a goal of researchers in this field. Breakthroughs in efficiency have been achieved in the past decade, exceeding those of most thin film solar cells. However, the challenge of degradation and instability of perovskite solar cells is currently the bottleneck for their real-life application. Extensive research has been conducted to achieve simultaneously high efficiency and high stability, leading to considerable progress in device performance. A significant source causing degradation is the ingression of external materials, such as moisture and oxygen. In this review, the mechanisms of moisture and oxygen degradation occurring in perovskite absorber and charge transporting layers are interpreted. Primary approaches to simultaneously achieve high efficiency and high stability focus on encapsulation, interfacial layer engineering, process engineering, ion engineering, and dopant and alternative engineering. In brief, we review the materials development and engineering strategies to improve performance and identify the obstacles that hinder the realization of high stability along with high efficiency.

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Section: Ion Engineeringmentioning

confidence: 99%

Section: Ion Engineeringmentioning

confidence: 99%

Achieving Resistance against Moisture and Oxygen for Perovskite Solar Cells with High Efficiency and Stability

Chi

Banerjee

2021

Chem. Mater.

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“…Although Song et al have tried to use six different sole antisolvents to control the crystal growth of perovskite films, the performance of PSCs treated with these antisolvents is unsatisfactory. It is reported that adding a little IPA into the main solvent such as CB or ethyl acetate (EA) can regulate crystallization. − Thus, a homogeneous surface morphology, blurred grain boundaries, and larger grain sizes can be achieved, which can help to enhance the photovoltaic performance of PSCs. − However, the mixed CB and IPA (CI) antisolvent has not been reported in all-inorganic CsPbIBr 2 PSCs. In order to further regulate the micrograph of the low-temperature-processed CsPbIBr 2 film to prepare efficient and stable PSCs, the CI solution is chosen as an antisolvent.…”

Section: Introductionmentioning

confidence: 99%

A Mixed Antisolvent-Assisted Crystallization Strategy for Efficient All-Inorganic CsPbIBr₂ Perovskite Solar Cells by a Low-Temperature Process

Yang

et al. 2022

ACS Appl. Energy Mater.

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To improve the microstructure of low-temperature-processed CsPbIBr2 films, a chlorobenzene (CB) and isopropyl alcohol (IPA) mixed solution is used as an antisolvent to fabricate CsPbIBr2 films. It is found that the modified film by the mixed antisolvent demonstrates a better morphology, crystallinity, absorption of sunlight, less trap-state density (N trap), and suppressed carrier recombination. The modified perovskite solar cells (PSCs) without a hole-transport layer (HTL) achieve a champion efficiency of 7.05%, being much higher by 28.18% than that of the Reference-PSCs without an antisolvent. Moreover, the HTL of undoped zinc phthalocyanine (ZnPc) prepared by solution processing is used to promote charge transfer and protect the CsPbIBr2 film from damage caused by humid air at the CsPbIBr2/carbon interface. The best PSC with a structure of FTO/TiO2/CsPbIBr2/ZnPc/carbon yields a champion efficiency of 8.48% (Reference-PSC, 5.50%) with an open-circuit voltage of 1.23 V. The modified PSCs without encapsulation demonstrate improved humidity stability and retain about 90% (Reference-PSC, ∼70%) of their initial efficiency after storage at a 20% relative humidity in air for 30 days. In addition, the modified PSCs possess good light and thermal stability. Our work provides a feasible low-temperature (150 °C) process to prepare CsPbIBr2 films with the preferred orientation and stable, efficient all-inorganic PSCs (200 °C).

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“…The τ mean for the BrAL-film is 8.43 ns, which is higher than the value of 7.51 ns for the reference-film. The longer carrier lifetime confirms that the trap-assisted charge recombination has been suppressed in the BrAL-film, which will facilitate to enhance V oc and FF of BrAL-PSCs. , …”

Section: Resultsmentioning

confidence: 67%

“…The longer carrier lifetime confirms that the trap-assisted charge recombination has been suppressed in the BrAL-film, which will facilitate to enhance V oc and FF of BrAL-PSCs. 10,34 Figure 3a shows the J−V curves of reference-and BrAL-PSCs measured in the reverse scan (RS) direction. The corresponding photovoltaic parameters are listed in Table 1.…”

Section: Resultsmentioning

confidence: 99%

4-Bromoaniline Passivation for Efficient and Stable All-Inorganic CsPbI₂Br Planar Perovskite Solar Cells

Yang

Xie

et al. 2021

ACS Appl. Energy Mater.

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In this work, 4-bromoaniline (BrAL) is employed to modify the CsPbI2Br/carbon electrode interface to passivate defects of all-inorganic CsPbI2Br perovskite solar cells (PSCs). The effects of BrAL modification on the structure, light absorption, and trap-state density (N trap) of CsPbI2Br films and the carrier recombination process, photoelectrical characteristics, and air stability of the PSCs are systematically studied. The results show that the hydrophobic BrAL interlayer modification can lead to a better matched energy-level alignment, reduce the N trap to construct uniform CsPbI2Br films, and suppress carrier recombination to promote charge transport and collection. Thus, the modified PSC achieves a higher power conversion efficiency (PCE) of 11.34% with less hysteresis (reference-PSC, 9.50%) and better stability in ambient air. The BrAL passivation provides a good strategy to enhance the photoelectrical performance and air stability of all-inorganic PSCs.

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Enhanced performance and stability of ambient-processed CH3NH3PbI3-x(SCN)x planar perovskite solar cells by introducing ammonium salts

Cited by 15 publications

References 59 publications

Achieving Resistance against Moisture and Oxygen for Perovskite Solar Cells with High Efficiency and Stability

Achieving Resistance against Moisture and Oxygen for Perovskite Solar Cells with High Efficiency and Stability

A Mixed Antisolvent-Assisted Crystallization Strategy for Efficient All-Inorganic CsPbIBr₂ Perovskite Solar Cells by a Low-Temperature Process

4-Bromoaniline Passivation for Efficient and Stable All-Inorganic CsPbI₂Br Planar Perovskite Solar Cells

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Enhanced performance and stability of ambient-processed CH3NH3PbI3-x(SCN)x planar perovskite solar cells by introducing ammonium salts

Cited by 15 publications

References 59 publications

Achieving Resistance against Moisture and Oxygen for Perovskite Solar Cells with High Efficiency and Stability

Achieving Resistance against Moisture and Oxygen for Perovskite Solar Cells with High Efficiency and Stability

A Mixed Antisolvent-Assisted Crystallization Strategy for Efficient All-Inorganic CsPbIBr2 Perovskite Solar Cells by a Low-Temperature Process

4-Bromoaniline Passivation for Efficient and Stable All-Inorganic CsPbI2Br Planar Perovskite Solar Cells

Contact Info

Product

Resources

About

A Mixed Antisolvent-Assisted Crystallization Strategy for Efficient All-Inorganic CsPbIBr₂ Perovskite Solar Cells by a Low-Temperature Process

4-Bromoaniline Passivation for Efficient and Stable All-Inorganic CsPbI₂Br Planar Perovskite Solar Cells