Growth of 2D passivation layer in FAPbI3 perovskite solar cells for high open-circuit voltage

Wang, Jin; Liu, Le; Chen, Siqi; Ran, Guangliu; Zhang, Wenkai; Zhao, Min; Zhao, Chengjie; Lu, Fushen; Jiu, Tonggang; Li, Yuliang

doi:10.1016/j.nantod.2021.101357

Cited by 25 publications

(20 citation statements)

References 33 publications

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“…The existence of the interaction can fill iodide vacancies to passivate anion defects. [ 46,49 ] The above results indicate that the residual Cl‐PA + is anchored to the perovskite grain boundaries by filling the vacancies of [PbI 6 ] 4− octahedron with ‐NH 3+ groups and filling the iodine vacancies with Cl functional groups. The passivation of vacancy defects by Cl‐PA + at the grain boundary can effectively reduce the sites for water molecules to invade, and improve the stability of α‐FAPbI 3 .…”

Section: Resultsmentioning

confidence: 84%

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Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

et al. 2022

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Transition of δ‐phase formamidinium lead triiodide (δ‐FAPbI3) to pure α‐phase FAPbI3 (α‐FAPbI3) typically requires high processing temperature (150 °C), which often results in unavoidable residual stress. Besides, using methylammonium chloride (MACl) as additive in fabrication will cause MA residue in the film, compromising the compositional purity. Here, a stress‐released and compositional‐pure α‐FAPbI3 thin‐film is fabricated using 3‐chloropropylammonium chloride (Cl‐PACl) by two‐step annealing. The 2D template of n = 2 can preferentially form in perovskite with the introduction of Cl‐PACl at a temperature as low as 80 °C. Such a 2D template can guide the free components to form ordered α‐FAPbI3 and promote the transition of the formed δ‐FAPbI3 to α‐FAPbI3 by reducing the phase transition energy. As a result, the obtained perovskite films via low‐temperature phase‐transition have a high degree of crystal orientation and reduced residual stress. More importantly, most of the Cl‐PACl is volatilized during the subsequent high‐temperature annealing process accompanied by the disintegration of the 2D templates. The residual trace of Cl‐PA+ is mainly concentrated at the grain boundary near the perovskite surface layer, stabilizing α‐FAPbI3 and passivating defects. Perovskite solar cell based on pure α‐FAPbI3 achieves a power conversion efficiency of 23.03% with excellent phase stability and photo‐stability.

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Section: Resultsmentioning

confidence: 84%

“…It is the manifestation of the electron‐withdrawing effect of ‐Cl in Cl‐PA + in the perovskite system, indicating that there is also an interaction between ‐Cl in Cl‐PA + and the α‐FAPbI 3 perovskite structures. [ 46 ]…”

Section: Resultsmentioning

confidence: 99%

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

et al. 2022

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“…31 Wang et al designed a new molecule of cyclopropylcarbamidine hydrochloride (CPAH) to form a 2D layer for surface defect passivation. 32 Motivated by the latest successes in the efficiency enhancement of 2D PSCs by suitable design of functional molecules, 33,34 it is promising to further improve the device performance of MA-free PSCs by optimizing the 2D/3D architecture by functional molecule selection.…”

Section: Introductionmentioning

confidence: 99%

Efficient MA-free perovskite solar cells with balanced carrier transport achieved using 4-trifluorophenylammonium iodide

Liu

et al. 2022

J. Mater. Chem. A

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“…11 However, the 2D charge transmissive channel limits the enhancement of the PCE. 12 The symmetrical 3D-based PSCs possess high PCE 13 and poor stability. 14 A high charge transport in the 2D unsymmetrical perovskite is desirable for PSCs.…”

Section: Introductionmentioning

confidence: 99%

“…The unsymmetrical 2D PSCs show high stability owing to the effect of additives . However, the 2D charge transmissive channel limits the enhancement of the PCE . The symmetrical 3D-based PSCs possess high PCE and poor stability .…”

Section: Introductionmentioning

confidence: 99%

BT-MA_0.6FA_0.4PbI_3–xCl_x Unsymmetrical Perovskite for Solar Cells with Superior Stability and PCE over 23%

Huang

Chen

et al. 2022

ACS Appl. Energy Mater.

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Combining superior stability and high power conversion efficiency (PCE) is a challenge in 3D (three-dimensional) and 2D (two-dimensional) perovskite solar cell (PSC) research. Mitigating the limitations of the symmetrical 3D structure and 2D charge transmissive channel has also not been achieved. Analogous 2D unsymmetrical perovskite structure is an excellent strategy to establish a balance between stability and PCE. Here, the BT (1,2,4,5-benzenetetramine tetrahydrochloride)-MA 0.6 FA 0.4 PbI 3−x Cl x analogous 2D unsymmetrical perovskite film is applied to improve the PCE and stability of PSCs. The BT groups substitute the formamidinium and methylammonium ions, interact with lead trihalide to form a bond, and prevent the formation of vacancy traps from amino groups. The high electron density and extensive delocalized electrons of π-conjugated heterocycles of BT enhance charge transport and separation. The chloride from BT provides a rich halogen environment, which further improves the quality of the perovskite film. The BT-MA 0.6 FA 0.4 PbI 3−x Cl x PSC exhibits superior PCE and stability, simultaneously. The champion PCE is up to 23.33%, which is also a record PCE for MAPbI 3−x Cl x PSCs. Compared with the pristine MA 0.6 FA 0.4 PbI 3−x Cl x PSC, the stability of the optimized device is improved by 10−20% under different conditions. The enhanced performance is ascribed to the stable unsymmetrical structure, excellent charge transport, and high quality of the perovskite film.

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Growth of 2D passivation layer in FAPbI3 perovskite solar cells for high open-circuit voltage

Cited by 25 publications

References 33 publications

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Efficient MA-free perovskite solar cells with balanced carrier transport achieved using 4-trifluorophenylammonium iodide

BT-MA_0.6FA_0.4PbI_3–xCl_x Unsymmetrical Perovskite for Solar Cells with Superior Stability and PCE over 23%

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Growth of 2D passivation layer in FAPbI3 perovskite solar cells for high open-circuit voltage

Cited by 25 publications

References 33 publications

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI3 Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI3 Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Efficient MA-free perovskite solar cells with balanced carrier transport achieved using 4-trifluorophenylammonium iodide

BT-MA0.6FA0.4PbI3–xClx Unsymmetrical Perovskite for Solar Cells with Superior Stability and PCE over 23%

Contact Info

Product

Resources

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Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

Low‐Temperature Phase‐Transition for Compositional‐Pure α‐FAPbI₃ Solar Cells with Low Residual‐Stress and High Crystal‐Orientation

BT-MA_0.6FA_0.4PbI_3–xCl_x Unsymmetrical Perovskite for Solar Cells with Superior Stability and PCE over 23%